JP5632329B2 - High-speed chaotic optical signal generation optical circuit and high-speed chaotic optical signal generation method - Google Patents

Description

  The present invention generates a random number used in a computer that performs calculations such as device modeling, financial derivative calculation, and weather simulation, a random number used in a secret key sharing cryptographic system, or a random number used in quantum cryptography communication. The present invention relates to a high-speed chaotic optical signal generation optical circuit and a high-speed chaotic optical signal generation method.

  Conventionally, as a method for generating a random number, roughly three methods have been proposed. The first random number generation method generates random numbers by calculation based on a random number generation program. The second random number generation method generates a random number based on physical noise inherent in an electronic circuit.

  According to the third random number generation method, (1) a chaos laser (see Non-Patent Document 1) or (2) laser light is used according to the output power of a predetermined time using an E / O (Electrical / Optical) modulator. An optical chaos signal source (see Patent Document 1) having an O / E (Optical / Electrical) conversion delay feedback electric circuit that modulates the intensity and (3) the optical path length difference between the two interference arms is controlled by the thermo-optic effect. A device that uses a plurality of Mach-Zehnder interferometers controlled so as to have a certain relationship in the optical path length difference, and realizes a chaos mapping relationship with the output power from each Mach-Zehnder interferometer (see Patent Document 2) ) Or the like to generate a random number based on the output chaotic signal.

  The first and second random number generation methods described above have a generation speed limit based on the operating frequency of a practical electronic device (see Non-Patent Document 2), and are sufficiently compatible with high-speed signal generation exceeding 10 Gb / s. I can't.

  In the random number generation by the chaotic laser disclosed in Non-Patent Document 1, it has been reported that the random number generation can be performed at a very high speed, but reproducibility should be ensured due to the complexity of the chaotic laser system. In addition, since the system configuration includes an optical fiber portion and the like, it is difficult to integrate and downsize the entire system.

  In addition, the random number generated by the chaotic laser is a signal generated based on the periodicity resulting from the use of an optical resonator or a well-known chaos generation mechanism, so that the output signal light has chaotic properties. Although recognized, it is imperfect in terms of randomness and does not mean a “random” signal similar to thermal noise.

  For this reason, in the example of Non-Patent Document 1, first, two chaotic output optical signals are prepared, and XOR logic operation processing is performed after 1-bit AD conversion is performed on the two chaotic output optical signals. It is necessary to improve the randomness of the signal by post-processing such as logic operation. For this reason, it is inevitable that the system becomes complicated and large including a post-processing logic operation unit.

Even in the random number generation by the optical chaotic signal source disclosed in Patent Document 1, it is difficult to integrate the entire system because a system configuration including an optical fiber unit and a high-frequency electric amplifier is required.
In the optical chaos random number generator disclosed in Patent Document 2, there is a limit of random number generation speed based on the control speed (several ms) based on the thermo-optic effect, and in addition, a temperature control unit, a digital data processing unit, a storage device, etc. Therefore, there is a problem that it is difficult to integrate the entire apparatus.

Japanese Patent No. 2960406 Japanese Patent No. 3396883

A. Uchida, et al., “Fast physical random bit generation with chaotic semiconductor lasers”, Nature Photonics, vol.2, p.728-732, 2008 "Efforts of Switch Optical Technology Entering Tbit / sec", Nikkei Electronics, No.719, p.107-113, 1998.6.29

As described above, the first and second random number generation methods have a problem that they cannot cope with high-speed signal generation exceeding 10 Gb / s.
In the random number generation method using a chaotic laser disclosed in Non-Patent Document 1, it is difficult to integrate and downsize the system, and there is a problem that the system becomes complicated in order to increase the randomness of the signal.

The random number generation method using an optical chaos signal source disclosed in Patent Document 1 has a problem that it is difficult to integrate and downsize the system.
The optical chaos random number generator disclosed in Patent Document 2 has a problem that it is difficult to deal with high-speed signal generation, and in addition, it is difficult to integrate the entire system.

  The purpose of the present invention is to generate random numbers used in calculators that perform calculations such as device modeling, financial derivative calculations, weather simulations, random numbers used in secret key sharing cryptosystems, or random numbers used in quantum cryptography communications. High-speed optical random number that utilizes the characteristics of the optical chaos system suitable for high-speed operation in the high-speed chaos optical signal generation optical circuit and the high-speed chaos optical signal generation method To provide a high-speed chaotic optical signal generating optical circuit and a high-speed chaotic optical signal generating method capable of generating random numbers with high randomness that can meet the generation request.

The high-speed chaotic optical signal generation optical circuit of the present invention includes a first Mach-Zehnder interference type optical intensity modulation means MZ-1 for inputting an RZ type clock signal light, and a second Mach-Zehnder for inputting the RZ type clock signal light. Two first optical output ports P-MZ-1-cross and P-MZ-1-bar of the interference type light intensity modulation means MZ-2 and the first Mach-Zehnder interference type light intensity modulation means MZ-1. The first optical demultiplexing means SP-1 for demultiplexing the RZ type clock signal light output from either of the two systems into two systems, and the second Mach-Zehnder interference type optical intensity modulation means MZ-2. A second optical component that demultiplexes the RZ-type clock signal light output from any one of the two second optical output ports P-MZ-2-cross and P-MZ-2-bar into four systems. Wave means SP-2 and the first The two systems of RZ type clock signal light demultiplexed by the optical demultiplexing means SP-1 are used as the first clock signal light for phase modulation driving in the first Mach-Zehnder interference type light intensity modulation means MZ-1. For phase modulation driving, two of the first optical waveguide guided to the first phase modulation means and the four RZ type clock signal lights demultiplexed by the second optical demultiplexing means SP-2 are used. A second optical waveguide guided to the second phase modulation means in the second Mach-Zehnder interference type light intensity modulation means MZ-2 as the second clock signal light, and the second optical demultiplexing means SP The second MZ-Zehnder interferometric light intensity modulation means MZ-1 is the remaining two of the four RZ-type clock signal lights demultiplexed by -2 as the third clock signal light for phase modulation driving. And a third optical waveguide leading to the third phase modulation means The first Mach-Zehnder interference type optical intensity modulation means MZ-1 includes a first optical input port P-MZ-1-1 that receives the RZ type clock signal light, and the first optical input port P-. Two first interference arms that transmit RZ type clock signal light input to MZ-1-1 and the two first optical output ports provided at the ends of the two first interference arms P-MZ-1-cross, P-MZ-1-bar, and one RZ-type clock signal light provided by the two first interference arms and transmitted by the first interference arm, The first phase modulation means R1-1 and L1-1 that perform phase modulation according to the light intensity of the RZ type clock signal light input from the first optical waveguide, and the first phase modulation means R1-1 and R1-1 The two first interference arms behind L1-1 The RZ-type clock signal light transmitted by the first interference arm is phase-modulated according to the light intensity of the RZ-type clock signal light input from the third optical waveguide. 3, and the second Mach-Zehnder interferometric light intensity modulating means MZ-2 is a second optical input port P− that receives the RZ type clock signal light. MZ-2-1, two second interference arms that transmit the RZ-type clock signal light input to the second optical input port P-MZ-2-1, and the two second interference arms The two second optical output ports P-MZ-2-cross and P-MZ-2-bar provided at the ends of the first and second interference arms are provided one by one. RZ type clock transmitted by two interference arms The signal light is composed of RZ type optical clock signal of the second phase modulating means for phase modulation in accordance with the light intensity R2, L2 Metropolitan inputted from the second optical waveguide, fast chaotic optical signal generating light circuit The whole is manufactured by integrating with an optical semiconductor, or the first phase modulation means R1-1, L1-1, the second phase modulation means R2, L2, and the third phase modulation means R1-2. A portion excluding L1-2 is constituted by PLC, and the first phase modulation means R1-1, L1-1, the second phase modulation means R2, L2, and the third phase modulation means R1-2, L1-2 is composed of an optical semiconductor, and the entire high-speed chaotic optical signal generating optical circuit is manufactured by a hybrid of PLC and optical semiconductor, or the first phase modulation means R1-1, L1-1 and the first Two phase modulation means R2, L2 and the third A portion excluding the phase modulation means R1-2 and L1-2 is constituted by a photonic crystal waveguide, and the first phase modulation means R1-1 and L1-1 and the second phase modulation means R2 and L2 As the third phase modulation means R1-2 and L1-2, a configuration in which a quantum dot group is embedded in a core layer is used, and the entire high-speed chaos optical signal generation optical circuit is integrated to produce the first Mach-Zehnder interference. Characterized in that output signal light is obtained from either one of the two first light output ports P-MZ-1-cross and P-MZ-1-bar of the light intensity modulation means MZ-1 It is.

The high-speed chaotic optical signal generation optical circuit according to the present invention includes a first Mach-Zehnder interferometric light intensity modulation means MZ-1 for inputting RZ type clock signal light, and a second for inputting the RZ type clock signal light. Mach-Zehnder interference type light intensity modulation means MZ-2 and two first optical output ports P-MZ-1-cross, P-MZ-1 of the first Mach-Zehnder interference type light intensity modulation means MZ-1 A first optical demultiplexing means SP-1 for demultiplexing the RZ type clock signal light output from either one of the two bars into two systems, and the second Mach-Zehnder interference type optical intensity modulating means MZ- The second RZ-type clock signal light output from one of the two second optical output ports P-MZ-2-cross and P-MZ-2-bar is divided into two systems. With optical demultiplexing means SP-2-1 Of the two second optical output ports P-MZ-2-cross and P-MZ-2-bar of the second Mach-Zehnder interference type optical intensity modulation means MZ-2, the second optical demultiplexing means Third optical demultiplexing means SP-2-2 for demultiplexing the RZ-type clock signal light output from the one not connected to SP-2-1 into two systems, and the first optical demultiplexing means SP The first phase modulation in the first Mach-Zehnder interferometric light intensity modulation means MZ-1 is performed by using two systems of RZ type clock signal light demultiplexed by −1 as first clock signal light for phase modulation driving. A first optical waveguide guided to the means, and two systems of RZ type clock signal light demultiplexed by the second optical demultiplexing means SP-2-1 as second clock signal light for phase modulation driving The second position in the second Mach-Zehnder interference type light intensity modulating means MZ-2 A second optical waveguide guided to the modulation means, and a third clock signal light for phase modulation driving the two systems of RZ type clock signal light demultiplexed by the third optical demultiplexing means SP-2-2 And a third optical waveguide leading to the third phase modulation means in the first Mach-Zehnder interference type light intensity modulation means MZ-1, and the first Mach-Zehnder interference type light intensity modulation means MZ- Reference numeral 1 denotes a first optical input port P-MZ-1-1 that receives the RZ-type clock signal light, and RZ-type clock signal light that is input to the first optical input port P-MZ-1-1. Two first interference arms for transmission and the two first optical output ports P-MZ-1-cross and P-MZ-1-bar provided at the ends of the two first interference arms And one for each of the two first interference arms, The first phase modulation means R1-1, which modulates the phase of the RZ type clock signal light transmitted by one interference arm in accordance with the light intensity of the RZ type clock signal light input from the first optical waveguide. L1-1 and one RZ type provided on each of the two first interference arms behind the first phase modulation means R1-1 and L1-1 and transmitted by the first interference arm The third phase modulation means R1-2 and L1-2 that phase-modulate the clock signal light according to the light intensity of the RZ type clock signal light input from the third optical waveguide, and The Mach-Zehnder interference type optical intensity modulation means MZ-2 includes a second optical input port P-MZ-2-1 that receives the RZ type clock signal light, and a second optical input port P-MZ-2. RZ type clock signal input to -1. Two second interference arms for transmitting light, and the two second optical output ports P-MZ-2-cross, P-MZ-2 provided at the ends of the two second interference arms -Bar and an RZ-type clock signal that is provided for each of the two second interference arms and that is transmitted by the second interference arm and that is input from the second optical waveguide. The second phase modulation means R2 and L2 that modulate the phase according to the light intensity of light , and are manufactured by integrating the entire high-speed chaotic optical signal generating optical circuit with an optical semiconductor, or the first phase A portion excluding the modulation means R1-1, L1-1, the second phase modulation means R2, L2, and the third phase modulation means R1-2, L1-2 is constituted by a PLC, and the first phase. Modulating means R1-1, L1-1 and the second The phase modulation means R2, L2 and the third phase modulation means R1-2, L1-2 are made of an optical semiconductor, and the entire high-speed chaotic optical signal generation optical circuit is made of a hybrid of PLC and an optical semiconductor, Alternatively, the portion excluding the first phase modulation means R1-1 and L1-1, the second phase modulation means R2 and L2, and the third phase modulation means R1-2 and L1-2 is a photonic crystal guide. A quantum dot group is configured as the first phase modulation means R1-1, L1-1, the second phase modulation means R2, L2, and the third phase modulation means R1-2, L1-2. Using the configuration embedded in the core layer, the entire high-speed chaotic optical signal generating optical circuit is integrated and manufactured, and the two first optical output ports P- of the first Mach-Zehnder interference type optical intensity modulation means MZ-1 MZ-1-cross, P-MZ-1 The output signal light is obtained from any one of -bars.

Further, one configuration example of the high-speed chaotic optical signal generating optical circuit according to the present invention is further provided in the first optical waveguide, and is divided into two systems of RZs demultiplexed by the first optical demultiplexing means SP-1. A delay corresponding to the optical propagation delay difference until the clock signal light reaches the first phase modulation means R1-1 and L1-1 is input to the first phase modulation means R1-1 and L1-1. Of the two RZ-type clock signal lights, the first RZ-type clock signal light having a longer optical propagation delay until reaching the first phase modulation means R1-1 and L1-1. Of the four RZ-type clock signal lights provided in the optical propagation delay difference providing means D-D-1 and the second optical waveguide and demultiplexed by the second optical demultiplexing means SP-2. Delay corresponding to the difference in optical propagation delay until the two systems reach the second phase modulation means R2 and L2. Among the two systems of RZ type clock signal light input to the second phase modulation means R2 and L2, the RZ type having the longer optical propagation delay until reaching the second phase modulation means R2 and L2. Second optical propagation delay difference applying means DD-2 for applying to the clock signal light and four systems provided in the third optical waveguide and demultiplexed by the second optical demultiplexing means SP-2 The delay corresponding to the difference in optical propagation delay until two systems of the RZ type clock signal light reach the third phase modulation means R1-2 and L1-2 is set as the third phase modulation means R1- RZ type clock signal having a longer optical propagation delay until it reaches the third phase modulation means R1-2 and L1-2, out of the two systems of RZ type clock signal light inputted to 2 and L1-2. and a third optical propagation delay difference applying means D-D-2-1 to impart to the light, the first The optical propagation delay difference providing means DD-1, the first optical propagation delay difference providing means DD-1 and the third optical propagation delay difference providing means DD-2-1 are combined with an optical semiconductor. Or a high-speed chaotic optical signal generating optical circuit integrated with an optical semiconductor, or the first optical propagation delay difference providing means DD-1 and the first optical propagation delay difference providing means. D-D-1 and the third optical propagation delay difference providing means D-D-2-1 are configured by PLC, and the entire high-speed chaotic optical signal generating optical circuit is manufactured by a hybrid of PLC and optical semiconductor, Alternatively, the first optical propagation delay difference providing unit DD-1, the first optical propagation delay difference providing unit DD-1, and the third optical propagation delay difference providing unit DD-2-1. And a photonic crystal waveguide, and the entire high-speed chaotic optical signal generation optical circuit is integrated and manufactured. It is a feature.

Further, one configuration example of the high-speed chaotic optical signal generating optical circuit according to the present invention is further provided in the first optical waveguide, and is divided into two systems of RZs demultiplexed by the first optical demultiplexing means SP-1. A delay corresponding to the optical propagation delay difference until the clock signal light reaches the first phase modulation means R1-1 and L1-1 is input to the first phase modulation means R1-1 and L1-1. Of the two RZ-type clock signal lights, the first RZ-type clock signal light having a longer optical propagation delay until reaching the first phase modulation means R1-1 and L1-1. Two RZ-type clock signal lights provided in the optical propagation delay difference applying means D-D-1 and the second optical waveguide and demultiplexed by the second optical demultiplexing means SP-2-1 are provided. A delay corresponding to a difference in optical propagation delay until reaching the second phase modulation means R2, L2, RZ type clock signal light having a longer optical propagation delay until it reaches the second phase modulation means R2 and L2 among the two systems of RZ type clock signal light inputted to the two phase modulation means R2 and L2. The second optical propagation delay difference applying means DD-2 applied to the second optical waveguide and the third optical demultiplexing means SP-2-2. A delay corresponding to the optical propagation delay difference until the RZ type clock signal light reaches the third phase modulation means R1-2 and L1-2 is given to the third phase modulation means R1-2 and L1-2. Of the two RZ-type clock signal lights to be input, the third is given to the RZ-type clock signal light having a longer light propagation delay until reaching the third phase modulation means R1-2 and L1-2. and an optical propagation delay difference providing means D-D-2-1 of the first optical propagation delay difference The providing means DD-1, the second optical propagation delay difference providing means DD-2, and the third optical propagation delay difference providing means DD-2-1 are made of an optical semiconductor, and can be operated at high speed. The entire chaotic optical signal generating optical circuit is integrated with an optical semiconductor, or the first optical propagation delay difference providing means DD-1 and the second optical propagation delay difference providing means DD-2. And the third optical propagation delay difference providing means DD-2-1 are configured by PLC, and the entire high-speed chaotic optical signal generating optical circuit is manufactured by a hybrid of PLC and optical semiconductor, or An optical propagation delay difference applying means DD-1, the second optical propagation delay difference applying means DD-2, and the third optical propagation delay difference applying means DD-2-1 are combined with a photonic crystal. It consists of a waveguide and is manufactured by integrating the entire high-speed chaotic optical signal generation optical circuit. is there.

The present invention also relates to a high-speed chaos optical signal generation method for generating output signal light in a high-speed chaos optical signal generation optical circuit, wherein the RZ type clock signal light is converted into first Mach-Zehnder interference type optical intensity modulation means MZ. -1 first optical input port P-MZ-1-1 and the second Mach-Zehnder interference type optical intensity modulation means MZ-2 of the second optical input port P-MZ-2-1, RZ output from one of the two first optical output ports P-MZ-1-cross and P-MZ-1-bar of the first Mach-Zehnder interference type optical intensity modulation means MZ-1. Type clock signal light is used as first clock signal light for phase modulation driving, and is provided on each of the two first interference arms in the first Mach-Zehnder interference type light intensity modulation means MZ-1. 1 phase modulation means R1- 1 and L1-1, the phase difference between the RZ-type clock signal light input from the first optical input port P-MZ-1-1 and propagating through the two first interference arms. At the same time, one of the two second optical output ports P-MZ-2-cross and P-MZ-2-bar of the second Mach-Zehnder interference type light intensity modulating means MZ-2 The RZ type clock signal light output from one side is used as the second clock signal light for phase modulation driving, and is applied to two second interference arms in the second Mach-Zehnder interference type optical intensity modulation means MZ-2. By being input to the second phase modulation means R2 and L2 provided one by one, it is transmitted from the second optical input port P-MZ-2-1 and propagates through the two second interference arms. RZ type clock signal light phase Furthermore, any one of the two second optical output ports P-MZ-2-cross and P-MZ-2-bar of the second Mach-Zehnder interference type light intensity modulation means MZ-2 The RZ type clock signal light output from one side is used as the third clock signal light for phase modulation driving, and the two first interference arms behind the first phase modulation means R1-1 and L1-1. Are phase-modulated by the first phase modulation means R1-1 and L1-1 and input to the third phase modulation means R1-2 and L1-2. A phase difference is produced in the RZ type clock signal light propagating in the interference arm, and the entire high-speed chaotic optical signal generating optical circuit is integrated with an optical semiconductor, or the first phase modulating means R1-1 is used. , L1-1 and the second A portion excluding the phase modulation means R2, L2 and the third phase modulation means R1-2, L1-2 is constituted by a PLC, and the first phase modulation means R1-1, L1-1 and the second phase modulation means R1-2, L1-2 The phase modulation means R2, L2 and the third phase modulation means R1-2, L1-2 are made of an optical semiconductor, and the entire high-speed chaotic optical signal generation optical circuit is made of a hybrid of PLC and optical semiconductor, Alternatively, the portion excluding the first phase modulation means R1-1 and L1-1, the second phase modulation means R2 and L2, and the third phase modulation means R1-2 and L1-2 is a photonic crystal guide. A quantum dot group is configured as the first phase modulation means R1-1, L1-1, the second phase modulation means R2, L2, and the third phase modulation means R1-2, L1-2. High-speed chaotic optical signal generation using a configuration embedded in the core layer The entire optical circuit is integrated to produce two first optical output ports P-MZ-1-cross and P-MZ-1-bar of the first Mach-Zehnder interference type light intensity modulation means MZ-1. The output signal light is obtained from any one of them.

Further, in one configuration example of the high-speed chaotic optical signal generation method of the present invention, the RZ type clock signal light used as the first clock signal light for phase modulation driving is transmitted from the same optical output port as the output signal light. This is the output RZ type clock signal light.
In one configuration example of the high-speed chaotic optical signal generation method of the present invention, the RZ type clock signal light used as the first clock signal light for phase modulation driving is output from an optical output port different from the output signal light. RZ type clock signal light.
In one configuration example of the high-speed chaotic optical signal generation method of the present invention, the RZ type clock signal light used as the second clock signal light for phase modulation driving and the third clock signal light for phase modulation driving. The RZ type clock signal light used as is an RZ type clock signal light output from the same optical output port.
In one configuration example of the high-speed chaotic optical signal generation method of the present invention, the RZ type clock signal light used as the second clock signal light for phase modulation driving and the third clock signal light for phase modulation driving. The RZ type clock signal light used as is an RZ type clock signal light output from a different optical output port.

  According to the present invention, one of the two first optical output ports P-MZ-1-cross and P-MZ-1-bar of the first Mach-Zehnder interference type light intensity modulating means MZ-1 The RZ type clock signal light output from the first Mach-Zehnder interference type optical intensity modulation means MZ-1 is used as the first clock signal light for phase modulation driving, one by one on the two first interference arms. By being input to the provided first phase modulation means R1-1 and L1-1, it is input from the first optical input port P-MZ-1-1 and propagates through the two first interference arms. A phase difference is caused in the RZ type clock signal light, and at the same time, two second optical output ports P-MZ-2-cross, P-MZ- of the second Mach-Zehnder interference type optical intensity modulation means MZ-2 From either one of 2-bar RZ type clock signal light to be applied is provided as second clock signal light for phase modulation driving, one at each of the two second interference arms in the second Mach-Zehnder interference type light intensity modulation means MZ-2. RZ type clock signal that is input from the second optical input port P-MZ-2-1 and propagates through the two second interference arms by being input to the second phase modulation means R2 and L2 A phase difference is generated in the light, and the second Mach-Zehnder interference type optical intensity modulation means MZ-2 has two second optical output ports P-MZ-2-cross and P-MZ-2-bar. The RZ type clock signal light output from either one of them is used as the third clock signal light for phase modulation driving, and the two first interferences behind the first phase modulation means R1-1 and L1-1. One on each arm RZ type clock which is phase-modulated by the first phase modulation means R1-1 and L1-1 and propagates through the two first interference arms by being input to the phase modulation means R1-2 and L1-2. Since a phase difference is generated in the signal light, it is basically a problem to apply an output signal from a system that conforms to chaos dynamics while applying a low-dimensional chaotic system that can be applied and realized engineeringly based on chaos dynamics. An optical chaos method that can obtain a more random output signal by suppressing regularity between adjacent signals in a continuous time series, and can simplify and integrate the entire system and is suitable for high speed It is possible to generate random numbers with high randomness that can respond to ultra-high-speed optical random number generation requests exceeding 10 Gb / s utilizing the above characteristics. In the present invention, it is possible to realize high-speed random number data generation exceeding 10 Gb / s, which cannot be realized by a conventional random number generation program or a random number generation method using an electronic circuit. Further, in the present invention, it is possible to realize reproducibility and controllability that are indispensable for engineering applications, which has been difficult with a complicated system configuration such as a random number generation method using a chaos laser, and has high accuracy and System integration can be realized. Further, in the present invention, it is possible to realize the integration of the system that cannot be realized by the random number generation method using the optical chaos signal source. In the present invention, since the randomness of the signal alone is insufficient, such as a random number generation method using a chaos laser or a random number generation method using an optical chaos signal source, a subsequent logic processing circuit or logic processing system is This eliminates the problem that the entire system becomes necessary. Further, in the present invention, by using a plurality of Mach-Zehnder interferometers that are controlled so as to have a certain relationship between the optical path length differences by controlling the optical path length difference between the two interference arms by the thermo-optic effect, There is no need to have an optical path length difference information storage device or temperature-based optical path length difference control unit like a device that realizes a chaotic mapping relationship with the output power from a Mach-Zehnder interferometer, which speeds up and integrates the system. Can be realized. Further, in the present invention, it is possible to realize reproducibility and controllability that are indispensable for engineering applications, which has been difficult with an apparatus that uses the optical chaos phenomenon of all light based on the nonlinear refractive index effect of an optical fiber. System integration can be realized.

It is a block diagram which shows the structural example of the high-speed chaotic optical signal production | generation optical circuit which concerns on the 1st Embodiment of this invention. It is a schematic diagram of the optical power change of the clock signal light in the first embodiment of the present invention. It is a figure which shows the input timing of the input clock signal light to an optical input port, and the input timing of the input signal light to a phase modulation part. It is a figure which shows the example of the normalization optical output intensity | strength of the clock light pulse output from the optical output port in the 1st Embodiment of this invention. It is a figure which shows the time-sequential return map of the optical signal according to normal chaotic dynamics. It is a figure which shows the time series return map of the optical signal according to the high-speed chaotic optical signal generation method which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structural example of the high-speed chaotic optical signal production | generation optical circuit which concerns on the 2nd Embodiment of this invention.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of a high-speed chaotic optical signal generating optical circuit according to the present embodiment.
The high-speed chaotic optical signal generation optical circuit according to the present embodiment includes optical outputs to be described later of the Mach-Zehnder interference light intensity modulation units MZ-1 and MZ-2 and the first Mach-Zehnder interference light intensity modulation unit MZ-1. An optical demultiplexing unit SP-1 that demultiplexes RZ (Return to Zero) type clock signal light output from the port P-MZ-1-cross into two systems, and a second Mach-Zehnder interference type optical intensity modulation unit MZ -2 optical demultiplexing unit SP-2 that demultiplexes RZ-type clock signal light output from an optical output port P-MZ-2-cross, which will be described later, into four systems, and demultiplexing by optical demultiplexing unit SP-1 A delay corresponding to a difference in optical propagation delay until the two RZ-type clock signal lights thus arrived at phase modulators R1-1 and L1-1 described later in the Mach-Zehnder interference type optical intensity modulator MZ-1 is obtained. , Input to phase modulators R1-1 and L1-1 Optical propagation delay difference providing unit D− that is applied to the RZ type clock signal light having the longer optical propagation delay until reaching the phase modulation units R1-1 and L1-1. D-1 and two of the four RZ-type clock signal lights demultiplexed by the optical demultiplexing unit SP-2 are phase modulation units R2 to be described later in the Mach-Zehnder interference light intensity modulation unit MZ-2. , L2 is a delay corresponding to the difference in optical propagation delay until reaching L2, among the two RZ-type clock signal lights input to the phase modulators R2 and L2, the light until reaching the phase modulators R2 and L2 Of the four systems of RZ type clock signal light demultiplexed by the optical propagation delay difference adding unit DD-2 for applying to the RZ type clock signal light having the longer propagation delay, and the optical demultiplexing unit SP-2. Two systems are phases to be described later in the Mach-Zehnder interference type light intensity modulation unit MZ-1. The delay corresponding to the difference in optical propagation delay until reaching the modulation units R1-2 and L1-2 is determined as the phase of the two RZ-type clock signal lights input to the phase modulation units R1-2 and L1-2. An optical propagation delay difference providing unit DD-2-1 for applying to the RZ type clock signal light having a longer optical propagation delay until reaching the modulation units R1-2 and L1-2.

  The Mach-Zehnder interference type light intensity modulation unit MZ-1 includes an optical input port P-MZ-1-1 that receives an RZ type clock signal light having a constant peak light power output from a clock signal light source (not shown), Two interference arms that transmit the RZ-type clock signal light input to the input port P-MZ-1-1, and two optical output ports P-MZ-1- provided at the ends of the two interference arms cross, P-MZ-1-bar, and two optical signals demultiplexed by the optical demultiplexing unit SP-1 are phase modulation described later in the two interference arms of the Mach-Zehnder interferometric light intensity modulation unit MZ-1. Optical input ports P-R1-1 and P-L1-1 for phase modulation driving for input to the units R1-1 and L1-1, and four optical signals demultiplexed by the optical demultiplexing unit SP-2 Mach-Zehnder interference type Optical input ports P-R1-2 and P-L1-2 for phase modulation driving for inputting to phase modulation units R1-2 and L1-2, which will be described later, in the two interference arms of the intensity modulation unit MZ-1. One RZ type clock signal light provided on each of the two interference arms and transmitted by the interference arm is used as the light of the RZ type clock signal light input from the optical input ports P-R1-1 and P-L1-1. One is provided in each of the phase modulation units R1-1 and L1-1 that performs phase modulation according to the intensity and the two interference arms behind the phase modulation units R1-1 and L1-1, and is transmitted by the interference arm. Phase modulators R1-2 and L1-2 that phase-modulate the RZ-type clock signal light according to the light intensity of the RZ-type clock signal light input from the optical input ports P-R1-2 and P-L1-2 Consists of

  The Mach-Zehnder interference light intensity modulator MZ-2 includes an optical input port P-MZ-2-1 that receives an RZ-type clock signal light having a constant peak light power output from a clock signal light source (not shown). Two interference arms that transmit the RZ type clock signal light input to the optical input port P-MZ-2-1, and two optical output ports P-MZ-2 provided at the ends of the two interference arms -Cross, P-MZ-2-bar, and two of the four optical signals demultiplexed by the optical demultiplexing unit SP-2 are converted into two of the Mach-Zehnder interference type optical intensity modulation unit MZ-2. Optical input ports P-R2 and P-L2 for phase modulation driving for inputting to phase modulation units R2 and L2 (to be described later) in the interference arm, one each provided for the two interference arms, and transmitted by the interference arm RZ type clock The issue light, and a phase modulation unit R2, L2 Metropolitan to phase modulation in accordance with the light intensity of the RZ type clock signal light inputted from the optical input port P-R2, P-L2.

  In FIG. 1, 100 is an optical waveguide having one end connected to the optical input port P-MZ-1-1 and the other end connected to the input of the phase modulation unit L1-1, and 101 is disposed close to the optical waveguide 100. The other end of the optical waveguide is connected to the input of the phase modulation unit R1-1, and 102 is an optical waveguide having one end connected to the output of the phase modulation unit L1-1 and the other end connected to the input of the phase modulation unit L1-2. Waveguide 103 has one end connected to the output of phase modulator R1-1 and the other end connected to the input of phase modulator R1-2. 104 has one end connected to the output of phase modulator L1-2. An optical waveguide having the other end connected to the optical output port P-MZ-1-bar, 105 has one end connected to the output of the phase modulator R1-2, and the other end connected to the optical output port P-MZ-1-cross And a part of the light arranged close to the optical waveguide 104 A waveguide.

  The optical waveguides 100, 102, 104 constitute one interference arm of the Mach-Zehnder interference type light intensity modulation unit MZ-1, and the optical waveguides 101, 103, 105 constitute the other of the Mach-Zehnder interference type light intensity modulation unit MZ-1. It constitutes an interference arm. An optical signal leaks between the optical waveguide 100 and the optical waveguide 101, and the optical signal input to the optical waveguide 100 is also input to the optical waveguide 101. The optical signal leaks between the optical waveguide 104 and the optical waveguide 105.

  Reference numeral 106 denotes an optical waveguide having one end connected to the optical input port P-MZ-2-1 and the other end connected to the input of the phase modulation unit L2. Reference numeral 107 denotes one end arranged close to the optical waveguide 106 and the other end. Is an optical waveguide connected to the input of the phase modulation unit R2, 108 is an optical waveguide having one end connected to the output of the phase modulation unit L2 and the other end connected to the optical output port P-MZ-2-bar, 109 is one end Is an optical waveguide that is connected to the output of the phase modulation section R2, has the other end connected to the optical output port P-MZ-2-cross, and a part of which is disposed close to the optical waveguide.

  The optical waveguides 106 and 108 constitute one interference arm of the Mach-Zehnder interference type light intensity modulation unit MZ-2, and the optical waveguides 107 and 109 constitute the other interference arm of the Mach-Zehnder interference type light intensity modulation unit MZ-2. doing. An optical signal leaks between the optical waveguide 106 and the optical waveguide 107, and the optical signal input to the optical waveguide 106 is also input to the optical waveguide 107. Between the optical waveguide 108 and the optical waveguide 109, optical signal leakage occurs mutually.

  110 is an optical waveguide having one end connected to the optical output port P-MZ-1-cross and the other end connected to the input of the optical demultiplexing unit SP-1, and 111 is one end of the optical demultiplexing unit SP-1. An optical waveguide connected to the first output and having the other end connected to the input of the optical propagation delay difference applying unit DD-1, 112 has one end connected to the output of the optical propagation delay difference applying unit DD-1. An optical waveguide having the other end connected to the optical input port P-L1-1, 113 has one end connected to the second output of the optical demultiplexing unit SP-1, and the other end connected to the optical input port P-R1-1. Optical waveguide.

  Reference numeral 114 denotes an optical waveguide having one end connected to the optical output port P-MZ-2-cross and the other end connected to the input of the optical demultiplexing unit SP-2. 115 is one end of the optical demultiplexing unit SP-2. An optical waveguide connected to the first output and having the other end connected to the input of the optical propagation delay difference applying unit DD-2. One end of the optical waveguide 116 is connected to the output of the optical propagation delay difference applying unit DD-2. An optical waveguide having the other end connected to the optical input port P-L2, 117 is an optical waveguide having one end connected to the second output of the optical demultiplexing unit SP-2 and the other end connected to the optical input port P-R2. , 118 is an optical waveguide having one end connected to the third output of the optical demultiplexing unit SP-2 and the other end connected to the input of the optical propagation delay difference providing unit DD-2-1. An optical waveguide connected to the output of the propagation delay difference providing unit DD-2-1 and having the other end connected to the optical input port PR1-2. 120 is an optical waveguide having one end and the other end connected to the fourth output of the optical demultiplexing section SP-2 is connected to the optical input port P-L1-2.

  FIG. 2 shows changes in the optical power of the clock signal light input to the optical input ports P-MZ-1-1 and P-MZ-2-1. Thus, the clock signal light input to the optical input ports P-MZ-1-1 and P-MZ-2-1 from a clock signal light source (not shown) is RZ type signal light with a constant peak light power. .

  Here, in the high-speed chaotic optical signal generation optical circuit of the present embodiment, the optical waveguide portion is configured by a low-loss semiconductor waveguide, and a semiconductor optical amplifier (SOA) or a quantum dot type SOA (QD-SOA) is used as a phase modulation unit. ) Or a configuration in which a semiconductor EA (Electro-absorption) modulator is used for constant voltage driving as a phase modulation unit, and the whole is integrated by an optical semiconductor.

  Further, in the high-speed chaotic optical signal generation optical circuit of the present embodiment, the optical waveguide portion is configured by PLC (Planar Lightwave Circuit), and SOA or QD-SOA is used as the phase modulation unit, or the semiconductor EA as the phase modulation unit A configuration in which the modulator is driven by constant voltage drive may be used, and the whole may be manufactured by a hybrid of PLC and optical semiconductor. Such an optical circuit is described in the document “T.Ito, et al.,“ Bit-rate and format conversion from 10-Gbit / s WDM channels to a 40-Gbit / s channel using a monolithic Sagnac interferometer integrated with parallelamplifier structure ”. , IEE Proc.-Optoelectron., Vol.151, No.1, p.41-45, February 2004 ”.

  In addition, the high-speed chaotic optical signal generation optical circuit of the present embodiment uses a configuration in which a photonic crystal waveguide is used for the optical waveguide portion, and a quantum dot group is embedded in the core layer as a phase modulation unit, and the whole is integrated integrally. May be produced. Such optical circuits are described in the literature “H. Nakamura, Y. Sugimoto, K. Kanamoto, N. Ikeda, Y. Tanaka, Y. Nakamura, S. Ohkouchi, Y. Watanabe, K. Inoue, H. Ishikawa and K. Asakawa, “Ultra-fast photonic crystal / quantum dot all-optical switch for future photonic networks”, Optics Express, vol. 12, no. 26, p. 6606-6614, 2004 ”.

  In a standard Mach-Zehnder interferometric light intensity modulation unit, a state in which no phase difference occurs when light propagates through two interference arms constituting an interferometer is a state in which modulation driving is not performed. 100% of the optical signal is output from the optical output port of the interference arm on the different side with respect to the interference arm on the input side. In a state where the phase difference is π when light propagates through the two interference arms, 100% of the optical signal is output from the optical output port of the interference arm on the same side as the optical input port.

  Therefore, when the clock signal light is input from the optical input port P-MZ-1-1 to the high-speed chaos optical signal generation optical circuit shown in FIG. 1, the first clock optical pulse p0 is the optical input port P-MZ- 100% is output from the optical output port P-MZ-1-cross of the interference arm on the side different from 1-1, and is demultiplexed into two optical clock pulses p0-1 and p0-2 by the optical demultiplexing unit SP-1. After the delay difference is subsequently given by the optical propagation delay difference giving means DD-1, the optical input ports P-R1-1, P-L1-1 to the phase modulators R1-1, L1-1, respectively. Is entered.

3A shows the input timing of the input clock signal light to the optical input port P-MZ-1-1, and FIG. 3B shows the input timing of the input signal light to the phase modulator R1-1. FIG. 3C is a diagram illustrating the input timing of the input signal light to the phase modulation unit L1-1.
As shown in FIG. 3B, the optical propagation delay difference is applied at the timing between the clock light pulse p0 input to the optical input port P-MZ-1-1 and the clock light pulse p1 of the next time step. The clock light pulse p0-1 to which the optical propagation delay by the part DD-1 is not given is input to the phase modulation part R1-1. On the other hand, as shown in FIG. 3C, an optical propagation delay is imparted by the optical propagation delay difference providing unit DD-1 at a timing between the clock optical pulse p1 and the clock optical pulse p2 of the next time step. The generated clock light pulse p0-2 is input to the phase modulator L1-1.

  The phase modulator R1-1 is input from the optical input port P-R1-1 immediately before the clock optical pulse p1 is input from the optical input port P-MZ-1-1 via the optical waveguides 100 and 101. The phase of the clock light pulse p1 is modulated according to the light intensity of the clock light pulse p0-1.

  On the other hand, the phase modulator L1-1 is input from the optical input port P-L1-1 immediately after the clock optical pulse p1 is input from the optical input port P-MZ-1-1 via the optical waveguide 100. The phase of the clock light pulse p1 is modulated according to the light intensity of the clock light pulse p0-2.

  As a result, Mach-Zehnder interferometric light intensity modulation is performed after the clock light pulse p0-1 is input to the phase modulation unit R1-1 until the clock light pulse p0-2 is input to the phase modulation unit L1-1. A phase difference is generated between the two interference arms of the unit MZ-1, and the optical output intensity of the clock light pulse p1 output from the optical output port P-MZ-1-cross is modulated.

  Similarly, it is demultiplexed by the optical demultiplexing unit SP-1 at the timing between the clock optical pulse p1 input to the optical input port P-MZ-1-1 and the clock optical pulse p2 of the next time step. Of the clock light pulses p1-1 and p1-2, the clock light pulse p1-1 to which the light propagation delay by the light propagation delay difference applying unit DD-1 is not applied is input to the phase modulation unit R1-1. The On the other hand, at the timing between the clock light pulse p2 and the clock light pulse p3 of the next time step, the clock light pulse p1-2 to which the light propagation delay is imparted by the light propagation delay difference imparting unit DD-1 is provided. Is input to the phase modulation unit L1-1.

  The phase modulation unit R1-1 receives a clock light pulse that is a demultiplexed light of the clock light pulse p1 immediately before the clock light pulse p2 is input from the optical input port P-MZ-1-1 through the optical waveguides 100 and 101. When p1-1 is input from the optical input port PR1-1, the phase of the clock light pulse p2 is modulated according to the light intensity of the clock light pulse p1-1.

  The phase modulation unit L1-1 receives a clock light pulse p1- that is a demultiplexed light of the clock light pulse p1 immediately after the clock light pulse p2 is input from the optical input port P-MZ-1-1 via the optical waveguide 100. When 2 is input from the optical input port P-L1-1, the phase of the clock light pulse p2 is modulated according to the light intensity of the clock light pulse p1-2. As a result, the optical output intensity of the clock optical pulse p2 output from the optical output port P-MZ-1-cross is modulated.

  As described above, at the timing between the clock light pulse p (t) (t = 0, 1, 2, 3,...) And the clock light pulse p (t + 1) of the next time step, One clock optical pulse p (t) output from the output port P-MZ-1-cross and demultiplexed by the optical demultiplexing unit SP-1 is input to the phase modulation unit R1-1, and the clock optical pulse p (t + 1) ) And the clock light pulse p (t + 2) of the next time step, the other clock light output from the optical output port P-MZ-1-cross and demultiplexed by the optical demultiplexing unit SP-1 The pulse p (t) is input to the phase modulation unit L1-1. As a result, the optical output intensity of the clock optical pulse p (t + 1) output from the optical output port P-MZ-1-cross is modulated. Thus, the modulation of the clock light pulses p1, p2, p3,.

  FIG. 4 is a diagram illustrating a normalized light output intensity obtained by normalizing the light intensity of the clock light pulse output from the light output port P-MZ-1-cross of the Mach-Zehnder interference type light intensity modulator MZ-1. This shows a case where the amount of phase modulation generated in the clock light pulse of the next time step by the clock light pulse output from the optical output port P-MZ-1-cross is 1.8261π.

  The clock output from the optical output port P-MZ-1-cross under the condition that the output is 100% from the optical output port P-MZ-1-cross of the Mach-Zehnder interference type optical intensity modulator MZ-1. By setting the phase modulators R1-1 and L1-1 so that the amount of phase modulation generated by the optical pulse in the clock optical pulse at the next time step is sufficient and appropriate, for example, as shown in FIG. As in the case, the intensity of the clock light pulse output from the optical output port P-MZ-1-cross becomes a chaotic state in time series, and at the same time, the clock light pulse output from the optical output port P-MZ-1-bar The intensity of chaos also becomes chaos in time series.

  The reason why the intensity of the clock light pulse output from the optical output port P-MZ-1-bar of the Mach-Zehnder interference type optical intensity modulator MZ-1 is also in a chaos state in time series is that the total light intensity of the clock light pulse is The clock light pulse having the remaining light intensity obtained by subtracting the light intensity of the same clock light pulse output from the light output port P-MZ-1-cross is output from the light output port P-MZ-1-bar. is there.

  However, the output clock signal light whose optical output intensity is chaotic in time series is required to have completely random characteristics like physical noise used as a physical random number source. Not suitable for the field. The reason for this is that a system that follows a dynamic system that generally behaves chaoticly behaves unpredictably and randomly in the long term, but the light intensity between adjacent pulses on a time step is, for example, shown in FIG. Because there is a clear relationship / correlation as shown in the return map, it becomes easy to predict the light intensity at the next time step from the light intensity at a certain time step. This is because it is not a good behavior. In the example of FIG. 5, it is shown that there is a correlation between the normalized light output intensity at the time step i and the normalized light output intensity at the next time step i + 1.

  Therefore, in the present embodiment, an additional logic operation process is applied to the problem that the output clock signal optical pulse train of the Mach-Zehnder interference type optical intensity modulation unit MZ-1 is not messy when viewed in a short time in a time series. It has been solved. In the present embodiment, a Mach-Zehnder interference light intensity modulator MZ-2 is provided separately from the Mach-Zehnder interference light intensity modulator MZ-1, and the light output port P of the Mach-Zehnder interference light intensity modulator MZ-2 is provided. -Under the condition that 100% is output from the MZ-2-cross, the clock light pulse output from the optical output port P-MZ-2-cross is clocked at the next time step in the phase modulators R2 and L2. The phase modulation amount generated in the optical pulse is set to be sufficient and appropriate, and the clock signal light synchronized with the clock signal light input to the optical input port P-MZ-1-1 is optically input. Input is also made to the port P-MZ-2-1.

  When the clock signal light is input from the optical input port P-MZ-2-1 of the Mach-Zehnder interference light intensity modulation unit MZ-2, similarly to the Mach-Zehnder interference light intensity modulation unit MZ-1, the first clock The optical pulse p0 is output 100% from the optical output port P-MZ-2-cross of the interference arm on the side different from the optical input port P-MZ-2-1, and the clock optical pulse p0 is output by the optical demultiplexing unit SP-2. -1 and p0-2, and after the delay difference is subsequently given by the optical propagation delay difference giving means DD-2, from the optical input ports PR-2 and PL-2, respectively, the phase modulators Input to R2 and L2.

  Then, at the timing between the clock light pulse p0 input to the optical input port P-MZ-2-1 and the clock light pulse p1 of the next time step, the light by the light propagation delay difference providing unit DD-2 The clock light pulse p0-1 to which the propagation delay is not given is input to the phase modulation unit R2. On the other hand, at the timing between the clock light pulse p1 and the clock light pulse p2 of the next time step, the clock light pulse p0-2 to which the light propagation delay is applied by the light propagation delay difference providing unit DD-2. Is input to the phase modulation unit L2.

  The phase modulation unit R2 receives the clock light pulse p0 input from the optical input port P-R2 immediately before the clock light pulse p1 is input from the optical input port P-MZ-2-1 through the optical waveguides 106 and 107. The phase of the clock light pulse p1 is modulated according to the light intensity of -1. The phase modulation unit L2 receives the clock light pulse p0-2 input from the optical input port P-L2 immediately after the clock light pulse p1 is input from the optical input port P-MZ-2-1 through the optical waveguide 106. The phase of the clock light pulse p1 is modulated according to the light intensity.

  As a result, the Mach-Zehnder interference light intensity modulation unit MZ-2 is from the time when the clock light pulse p0-1 is input to the phase modulation unit R2 to the time when the clock light pulse p0-2 is input to the phase modulation unit L2. A phase difference occurs between the two interference arms, and the optical output intensity of the clock optical pulse p1 output from the optical output port P-MZ-2-cross is modulated.

  As described above, at the timing between the clock light pulse p (t) (t = 0, 1, 2, 3,...) And the clock light pulse p (t + 1) of the next time step, One clock optical pulse p (t) output from the output port P-MZ-2-cross and demultiplexed by the optical demultiplexing unit SP-2 is input to the phase modulation unit R2, and the clock optical pulse p (t + 1) and The other clock light pulse p output from the optical output port P-MZ-2-cross and demultiplexed by the light demultiplexing unit SP-2 at the timing between the clock light pulse p (t + 2) of the next time step. (T) is input to the phase modulator L2. As a result, the optical output intensity of the clock optical pulse p (t + 1) output from the optical output port P-MZ-2-cross is modulated. Thus, similarly to the Mach-Zehnder interference type light intensity modulation unit MZ-1, the Mach-Zehnder interference type light intensity modulation unit MZ-2 continuously modulates the clock light pulses p1, p2, p3,. Done.

  The pulse train of the output clock signal light output from the optical output port P-MZ-2-cross of the Mach-Zehnder interference type light intensity modulation unit MZ-2 is the optical output port P of the Mach-Zehnder interference type light intensity modulation unit MZ-1. The pulse sequence of the output clock signal light output from -MZ-1-cross matches the clock timing, and the optical output intensity is chaotic in time series. In addition, the chaotic state generated in the pulse train of the output clock signal light output from the optical output port P-MZ-2-cross of the Mach-Zehnder interference type optical intensity modulation unit MZ-2 is a chaotic dynamic viewpoint. The pulse train of the output clock signal light from the optical output port P-MZ-1-cross is not affected at all.

  Therefore, due to the butterfly effect that is one of the characteristics of chaos, the optical output intensity of the pulse at a certain time step i included in the output clock signal optical pulse train from the optical output port P-MZ-1-cross is A state that cannot be predicted based on the light output intensity of the pulse at the time step i-1 immediately before the time step i included in the output clock signal optical pulse train from the output port P-MZ-2-cross, ie, light The output clock signal light from the output port P-MZ-1-cross and the output clock signal light from the optical output port P-MZ-2-cross are in a messy state.

  Next, the output clock signal light output from the optical output port P-MZ-2-cross is demultiplexed into four by the optical demultiplexing unit SP-2, and two outputs guided to the phase modulation units R2 and L2 A propagation delay difference is given to the remaining two output clock signal lights excluding the clock signal light by the optical propagation delay difference giving unit DD-2-1, and the two output clock signal lights to which the propagation delay difference is given are converted into Mach. The light is input from the optical input ports P-R1-2 and P-L1-2 of the Zehnder interference type light intensity modulation unit MZ-1 to the phase modulation units R1-2 and L1-2.

  The phase modulation units R1-2 and L1-2 are provided independently of the phase modulation units R1-1 and L1-1, and are input from the phase modulation units R1-1 and L1-1 via the optical waveguides 103 and 102. The phase modulation amount with respect to the maximum value of the intensity of the input clock signal light is set to be sufficient and appropriate. For this reason, the phase modulators R1-2 and L1-2 cause a phase difference between the two interference arms of the Mach-Zehnder interference light intensity modulator MZ-1.

  Thus, in the present embodiment, the chaotic state generated in the output clock signal optical pulse train from the optical output port P-MZ-2-cross is detected as the output clock signal optical pulse train from the optical output port P-MZ-1-cross. By convolving with respect to the chaos state occurring in the optical output port P-MZ-1-cross, the behavior of the optical output intensity of the output clock signal light from the optical output port P-MZ-1-cross can be made messy. In the present embodiment, when the optical circuit unit including the Mach-Zehnder interference type optical intensity modulation unit MZ-1, the optical demultiplexing unit SP-1, and the optical propagation delay difference providing unit DD-1 is driven alone. As shown in FIG. 6, the relationship of the light intensity between adjacent pulses on the time step, as shown in FIG. 6, can be lost, and a random number sequence with increased randomness can be generated.

  In this embodiment, it is possible to realize high-speed random number data generation exceeding 10 Gb / s, which cannot be realized by a conventional random number generation program or a random number generation method using an electronic circuit. Also, in this embodiment, the reproducibility and controllability that are indispensable for engineering applications, which was difficult with a complicated system configuration such as the random number generation method using a chaotic laser disclosed in Non-Patent Document 1, is realized. In addition, higher accuracy and system integration can be realized.

  Further, in this embodiment, it is possible to realize system integration that cannot be realized by the random number generation method using the optical chaos signal source disclosed in Patent Document 1. In this embodiment, the randomness of the signal alone is not possible, as in the random number generation method using a chaotic laser disclosed in Non-Patent Document 1 or the random number generation method using an optical chaos signal source disclosed in Patent Document 1. Since this is insufficient, it is possible to solve the problem that the subsequent logic processing circuit and logic processing system are required and the entire system becomes large.

  Further, in the present embodiment, by using a plurality of Mach-Zehnder interferometers that are controlled so as to give a certain relationship to the optical path length difference by controlling the optical path length difference between the two interference arms by the thermo-optic effect, There is no need to have an optical path length difference information storage device or temperature-based optical path length difference control unit like a device that realizes a chaotic mapping relationship with the output power from each Mach-Zehnder interferometer, and the system is speeded up and integrated. Can be realized.

  In addition, in this embodiment, it is possible to realize reproducibility and controllability that are indispensable for engineering applications, which has been difficult with an apparatus using an optical chaos phenomenon of all light based on the nonlinear refractive index effect of an optical fiber. Further, system integration can be realized.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. FIG. 7 is a block diagram showing a configuration example of the high-speed chaotic optical signal generation optical circuit according to the present embodiment, and the same components as those in FIG. 1 are denoted by the same reference numerals.
The high-speed chaotic optical signal generation optical circuit of the present embodiment is a Mach-Zehnder interference type optical intensity modulation unit MZ- instead of the optical demultiplexing unit SP-2 in the high-speed chaotic optical signal generation optical circuit of the first embodiment. Optical demultiplexing unit SP-2-1 for demultiplexing the optical signal output from the two optical output ports P-MZ-2-cross, and the optical output of the Mach-Zehnder interference type optical intensity modulation unit MZ-2 An optical demultiplexing unit SP-2-2 for demultiplexing the optical signal output from the port P-MZ-2-bar into two is provided.

  In FIG. 7, 121 is an optical waveguide having one end connected to the optical output port P-MZ-2-cross and the other end connected to the input of the optical demultiplexing unit SP-2-1, and 122 has one end connected to the optical demultiplexing unit SP. The optical waveguide is connected to the first output of 2-1 and the other end is connected to the input of the optical propagation delay difference adding unit DD-2, and 123 is one end of the optical demultiplexing unit SP-2-1. 2 is connected to the optical output port P-R2 and the other end is connected to the optical output port P-MZ-2-bar, and the other end is connected to the optical demultiplexing unit SP-2-. 1 is connected to the first output of the optical demultiplexing unit SP-2-2 and the other end is connected to the input of the optical propagation delay difference providing unit DD-2-1. One end of the connected optical waveguide 126 is connected to the second output of the optical demultiplexing unit SP-2-2, and the other end is the optical input port P-L1-2. It is connected to the optical waveguide.

  The output clock signal light output from the optical output port P-MZ-2-cross of the Mach-Zehnder interference type optical intensity modulation unit MZ-2 and demultiplexed into two by the optical demultiplexing unit SP-2-1 is Mach-Zehnder It is input to the phase modulators R2 and L2 as clock signal light for phase modulation driving in the interference light intensity modulator MZ-2. On the other hand, the output clock signal light output from the optical output port P-MZ-2-bar of the Mach-Zehnder interference type optical intensity modulation unit MZ-2 and split into two by the optical branching unit SP-2-2 is The clock signal light for driving the phase modulation in the Mach-Zehnder interference light intensity modulation unit MZ-1 is input to the phase modulation units R1-2 and L1-2.

  Since the operation of the high-speed chaotic optical signal generating optical circuit of this embodiment is the same as that of the first embodiment, detailed description thereof is omitted. Thus, in this embodiment, the same effect as that of the first embodiment can be obtained.

  In the first and second embodiments, the optical output port P-MZ-1-cross is connected to the input of the optical demultiplexing unit SP-1, but the optical output port P-MZ-1- You may make it connect bar and the input of optical demultiplexing part SP-1. Further, the optical output port P-MZ-2-bar is connected to the inputs of the optical demultiplexing units SP-2 and SP-2-1, and the optical output port P-MZ-2-cross and the optical demultiplexing unit SP- are connected. The input of 2-2 may be connected.

  In the first and second embodiments, the output of the optical propagation delay difference providing unit DD-2-1 is connected to the optical input port PR1-2. The output of DD-2-1 is connected to the optical input port P-L1-2, and among the outputs of the optical demultiplexing units SP-2 and SP2-2, the optical propagation delay difference adding unit DD-2-1. The output to which the optical propagation delay is not applied may be connected to the optical input port PR1-2.

  In the first and second embodiments, the RZ type clock signal light output from the same clock signal light source is demultiplexed in advance to generate the optical input ports P-MZ-1-1 and P-MZ-2. -1 or RZ type clock signal light output from the first clock signal light source is input to the optical input port P-MZ-1-1 and the first clock signal light source The RZ type clock signal light output from the synchronized second clock signal light source may be input to the optical input port P-MZ-2-1.

  In the first and second embodiments, the output signal light of the high-speed chaotic optical signal generation optical circuit is the two optical output ports P-MZ-1-cross of the Mach-Zehnder interference type optical intensity modulation unit MZ-1. , P-MZ-1-bar can be obtained from either one of them. At this time, the light intensity at 100% output is set to 1 and the threshold is set to 0.5. If the light intensity of the output signal light is larger than the threshold, the value of the binarized signal is set to 1, and the output signal light If the light intensity is less than or equal to the threshold value, a binary random number sequence is obtained by performing binarization processing in which the value of the binarized signal is 0.

  The present invention is a technique for generating random numbers used in a computer that performs calculations such as device modeling, financial derivative calculation, and weather simulation, a random number used in a secret key sharing cryptographic system, or a random number used in quantum cryptographic communication. Can be applied to.

  MZ-1, MZ-2: Mach-Zehnder interference type light intensity modulation unit, SP-1, SP-2, SP-2-1, SP-2-2 ... optical demultiplexing unit, DD-1, D- D-2, D-D-2-1 ... optical propagation delay difference providing unit, P-MZ-1-1, P-R1-1, P-L1-1, P-R1-2, P-L1-2 , P-MZ-2-1, P-R2, P-L2,... Optical input port, R1-1, R1-2, L1-1, L1-2, R2, L2,. -Cross, P-MZ-1-bar, P-MZ-2-cross, P-MZ-2-bar ... optical output port, 100-126 ... optical waveguide.

Claims (9)

First Mach-Zehnder interference type light intensity modulation means MZ-1 for inputting RZ type clock signal light;
A second Mach-Zehnder interference light intensity modulating means MZ-2 for inputting the RZ-type clock signal light;
RZ output from one of the two first optical output ports P-MZ-1-cross and P-MZ-1-bar of the first Mach-Zehnder interference type light intensity modulation means MZ-1. First optical demultiplexing means SP-1 for demultiplexing the type clock signal light into two systems;
RZ output from one of the two second optical output ports P-MZ-2-cross and P-MZ-2-bar of the second Mach-Zehnder interference type light intensity modulating means MZ-2 Second optical demultiplexing means SP-2 for demultiplexing the type clock signal light into four systems;
The first Mach-Zehnder interference type light intensity modulating means MZ using the two systems of RZ type clock signal light demultiplexed by the first optical demultiplexing means SP-1 as the first clock signal light for phase modulation driving. A first optical waveguide leading to first phase modulation means in -1,
Two of the four RZ-type clock signal lights demultiplexed by the second optical demultiplexing means SP-2 are used as the second clock signal light for phase modulation driving, and the second Mach-Zehnder interference type. A second optical waveguide leading to the second phase modulation means in the light intensity modulation means MZ-2;
The remaining two systems of the four systems of RZ type clock signal light demultiplexed by the second optical demultiplexing means SP-2 are used as the third clock signal light for phase modulation driving, and the first Mach-Zehnder. A third optical waveguide leading to the third phase modulation means in the interference type light intensity modulation means MZ-1,
The first Mach-Zehnder interference type light intensity modulation means MZ-1
A first optical input port P-MZ-1-1 that receives the RZ type clock signal light;
Two first interference arms for transmitting the RZ type clock signal light input to the first optical input port P-MZ-1-1;
The two first optical output ports P-MZ-1-cross, P-MZ-1-bar provided at the ends of the two first interference arms;
One RZ type clock signal light provided on each of the two first interference arms and transmitted by the first interference arm is used as the light intensity of the RZ type clock signal light input from the first optical waveguide. The first phase modulation means R1-1 and L1-1 that perform phase modulation according to
RZ type clock signal light that is provided one by one in the two first interference arms behind the first phase modulation means R1-1 and L1-1 and transmitted by the first interference arm, The third phase modulation means R1-2 and L1-2 that perform phase modulation according to the light intensity of the RZ-type clock signal light input from the third optical waveguide;
The second Mach-Zehnder interference type light intensity modulation means MZ-2 includes:
A second optical input port P-MZ-2-1 that receives the RZ type clock signal light;
Two second interference arms that transmit the RZ-type clock signal light input to the second optical input port P-MZ-2-1;
The two second optical output ports P-MZ-2-cross, P-MZ-2-bar provided at the ends of the two second interference arms;
One RZ type clock signal light provided on each of the two second interference arms and transmitted by the second interference arm is used as the light intensity of the RZ type clock signal light input from the second optical waveguide. The second phase modulation means R2 and L2 that perform phase modulation according to
The entire high-speed chaotic optical signal generation optical circuit is integrated with an optical semiconductor, or the first phase modulation means R1-1 and L1-1, the second phase modulation means R2 and L2, and the third phase modulation means. A portion excluding the phase modulation means R1-2 and L1-2 is configured by a PLC, and the first phase modulation means R1-1 and L1-1, the second phase modulation means R2 and L2, and the third phase modulation means R1-2 and L1-2. The phase modulation means R1-2 and L1-2 are made of optical semiconductors, and the entire high-speed chaotic optical signal generating optical circuit is made of a hybrid of PLC and optical semiconductor, or the first phase modulation means R1-1. , L1-1, the second phase modulation means R2, L2, and the third phase modulation means R1-2, L1-2 are configured by photonic crystal waveguides, and the first phase modulation is performed. Means R1-1, L1-1 and the second phase modulation hand R2, L2 and the third phase modulation means R1-2, quantum dot groups using the configuration embedded in the core layer, fabricated by integrating the entire high-speed chaotic optical signal generating optical circuit as L1-2,
Output signal light is output from either one of the two first optical output ports P-MZ-1-cross and P-MZ-1-bar of the first Mach-Zehnder interference type optical intensity modulation means MZ-1. A high-speed chaotic optical signal generating optical circuit. First Mach-Zehnder interference type light intensity modulation means MZ-1 for inputting RZ type clock signal light;
A second Mach-Zehnder interference light intensity modulating means MZ-2 for inputting the RZ-type clock signal light;
RZ output from one of the two first optical output ports P-MZ-1-cross and P-MZ-1-bar of the first Mach-Zehnder interference type light intensity modulation means MZ-1. First optical demultiplexing means SP-1 for demultiplexing the type clock signal light into two systems;
RZ output from one of the two second optical output ports P-MZ-2-cross and P-MZ-2-bar of the second Mach-Zehnder interference type light intensity modulating means MZ-2 Second optical demultiplexing means SP-2-1 for demultiplexing the type clock signal light into two systems;
Of the two second optical output ports P-MZ-2-cross and P-MZ-2-bar of the second Mach-Zehnder interference type optical intensity modulation means MZ-2, the second optical demultiplexing means Third optical demultiplexing means SP-2-2 for demultiplexing the RZ-type clock signal light output from the one not connected to SP-2-1 into two systems;
The first Mach-Zehnder interference type light intensity modulating means MZ using the two systems of RZ type clock signal light demultiplexed by the first optical demultiplexing means SP-1 as the first clock signal light for phase modulation driving. A first optical waveguide leading to first phase modulation means in -1,
The second Mach-Zehnder interferometric light intensity modulation is performed by using two systems of RZ type clock signal light demultiplexed by the second optical demultiplexing means SP-2-1 as second clock signal light for phase modulation driving. A second optical waveguide leading to second phase modulation means in the means MZ-2;
The first Mach-Zehnder interference light intensity modulation is performed by using two systems of RZ type clock signal light demultiplexed by the third optical demultiplexing means SP-2-2 as third clock signal light for phase modulation driving. A third optical waveguide leading to third phase modulation means in means MZ-1;
The first Mach-Zehnder interference type light intensity modulation means MZ-1
A first optical input port P-MZ-1-1 that receives the RZ type clock signal light;
Two first interference arms for transmitting the RZ type clock signal light input to the first optical input port P-MZ-1-1;
The two first optical output ports P-MZ-1-cross, P-MZ-1-bar provided at the ends of the two first interference arms;
One RZ type clock signal light provided on each of the two first interference arms and transmitted by the first interference arm is used as the light intensity of the RZ type clock signal light input from the first optical waveguide. The first phase modulation means R1-1 and L1-1 that perform phase modulation according to
RZ type clock signal light that is provided one by one in the two first interference arms behind the first phase modulation means R1-1 and L1-1 and transmitted by the first interference arm, The third phase modulation means R1-2 and L1-2 that perform phase modulation according to the light intensity of the RZ-type clock signal light input from the third optical waveguide;
The second Mach-Zehnder interference type light intensity modulation means MZ-2 includes:
A second optical input port P-MZ-2-1 that receives the RZ type clock signal light;
Two second interference arms that transmit the RZ-type clock signal light input to the second optical input port P-MZ-2-1;
The two second optical output ports P-MZ-2-cross, P-MZ-2-bar provided at the ends of the two second interference arms;
One RZ type clock signal light provided on each of the two second interference arms and transmitted by the second interference arm is used as the light intensity of the RZ type clock signal light input from the second optical waveguide. The second phase modulation means R2 and L2 that perform phase modulation according to
The entire high-speed chaotic optical signal generation optical circuit is integrated with an optical semiconductor, or the first phase modulation means R1-1 and L1-1, the second phase modulation means R2 and L2, and the third phase modulation means. A portion excluding the phase modulation means R1-2 and L1-2 is configured by a PLC, and the first phase modulation means R1-1 and L1-1, the second phase modulation means R2 and L2, and the third phase modulation means R1-2 and L1-2. The phase modulation means R1-2 and L1-2 are made of optical semiconductors, and the entire high-speed chaotic optical signal generating optical circuit is made of a hybrid of PLC and optical semiconductor, or the first phase modulation means R1-1. , L1-1, the second phase modulation means R2, L2, and the third phase modulation means R1-2, L1-2 are configured by photonic crystal waveguides, and the first phase modulation is performed. Means R1-1, L1-1 and the second phase modulation hand R2, L2 and the third phase modulation means R1-2, quantum dot groups using the configuration embedded in the core layer, fabricated by integrating the entire high-speed chaotic optical signal generating optical circuit as L1-2,
Output signal light is output from either one of the two first optical output ports P-MZ-1-cross and P-MZ-1-bar of the first Mach-Zehnder interference type optical intensity modulation means MZ-1. A high-speed chaotic optical signal generating optical circuit. The high-speed chaotic optical signal generating optical circuit according to claim 1,
Further, two RZ-type clock signal lights provided in the first optical waveguide and demultiplexed by the first optical demultiplexing means SP-1 are converted into the first phase modulation means R1-1 and L1-. The delay corresponding to the difference in optical propagation delay until reaching 1 is calculated by using the first phase of the two RZ-type clock signal lights input to the first phase modulation means R1-1 and L1-1. First optical propagation delay difference providing means DD-1 for applying to the RZ-type clock signal light having a longer light propagation delay until reaching the modulation means R1-1, L1-1,
Two of the four RZ-type clock signal lights provided in the second optical waveguide and demultiplexed by the second optical demultiplexing means SP-2 are the second phase modulation means R2, L2. The delay corresponding to the difference in optical propagation delay until reaching the second phase modulation means R2 and L2 among the two systems of RZ type clock signal light input to the second phase modulation means R2 and L2. Second optical propagation delay difference providing means DD-2 for imparting to the RZ type clock signal light having a longer light propagation delay until reaching
Two of the four RZ-type clock signal lights provided in the third optical waveguide and demultiplexed by the second optical demultiplexing means SP-2 are the third phase modulating means R1-2. , L1-2, a delay corresponding to the difference in optical propagation delay, among the two RZ-type clock signal lights input to the third phase modulation means R1-2 and L1-2, A third optical propagation delay difference providing unit DD-2-1 for applying to the RZ type clock signal light having a longer optical propagation delay until reaching the third phase modulation unit R1-2, L1-2. Prepared ,
The first light propagation delay difference providing means DD-1, the first light propagation delay difference providing means DD-1 and the third light propagation delay difference providing means DD-2-1. Or a first high-speed chaotic optical signal generation optical circuit integrated with an optical semiconductor, or the first optical propagation delay difference providing means DD-1 and the first optical propagation delay. The difference providing unit DD-1 and the third optical propagation delay difference providing unit DD-2-1 are configured by PLC, and the entire high-speed chaotic optical signal generating optical circuit is manufactured by a hybrid of PLC and optical semiconductor. Or the first optical propagation delay difference providing means DD-1, the first optical propagation delay difference providing means DD-1, and the third optical propagation delay difference providing means DD-. 2-1 is composed of photonic crystal waveguides, and the entire high-speed chaotic optical signal generation optical circuit is integrated and manufactured. Fast chaotic optical signal generating optical circuit, characterized in that. The high-speed chaotic optical signal generating optical circuit according to claim 2,
Further, two RZ-type clock signal lights provided in the first optical waveguide and demultiplexed by the first optical demultiplexing means SP-1 are converted into the first phase modulation means R1-1 and L1-. The delay corresponding to the difference in optical propagation delay until reaching 1 is calculated by using the first phase of the two RZ-type clock signal lights input to the first phase modulation means R1-1 and L1-1. First optical propagation delay difference providing means DD-1 for applying to the RZ-type clock signal light having a longer light propagation delay until reaching the modulation means R1-1, L1-1,
Two systems of RZ type clock signal light provided in the second optical waveguide and demultiplexed by the second optical demultiplexing means SP-2-1 reach the second phase modulation means R2 and L2. A delay corresponding to the difference in optical propagation delay until the second phase modulation means R2 and L2 of the two systems of RZ type clock signal light input to the second phase modulation means R2 and L2 is reached. Second optical propagation delay difference providing means DD-2 for applying to the RZ type clock signal light having the longer optical propagation delay until,
Two systems of RZ type clock signal light provided in the third optical waveguide and demultiplexed by the third optical demultiplexing means SP-2-2 are used as the third phase modulating means R1-2, L1-. The delay corresponding to the difference in optical propagation delay until reaching 2 is set to the third phase of the two RZ-type clock signal lights input to the third phase modulation means R1-2 and L1-2. A third optical propagation delay difference providing unit DD-2-1 for applying to the RZ type clock signal light having a longer optical propagation delay until reaching the modulating unit R1-2, L1-2 ,
The first optical propagation delay difference providing means DD-1, the second optical propagation delay difference providing means DD-2, the third optical propagation delay difference providing means DD-2-1, Or a first high-speed chaotic optical signal generating optical circuit integrated with an optical semiconductor, or the first optical propagation delay difference providing means DD-1 and the second optical propagation delay. The difference providing unit DD-2 and the third optical propagation delay difference providing unit DD-2-1 are configured by PLC, and the entire high-speed chaotic optical signal generating optical circuit is manufactured by a hybrid of PLC and optical semiconductor. Or the first optical propagation delay difference providing means DD-1, the second optical propagation delay difference providing means DD-2, and the third optical propagation delay difference providing means DD-. 2-1 is composed of photonic crystal waveguides, and the entire high-speed chaotic optical signal generation optical circuit is integrated and manufactured. Fast chaotic optical signal generating optical circuit, characterized in that. A high-speed chaotic optical signal generation method for generating output signal light in a high-speed chaotic optical signal generation optical circuit,
The RZ type clock signal light is supplied to the first optical input port P-MZ-1-1 of the first Mach-Zehnder interference type light intensity modulation means MZ-1 and the second Mach-Zehnder interference type light intensity modulation means MZ-2. Input to the second optical input port P-MZ-2-1,
RZ output from one of the two first optical output ports P-MZ-1-cross and P-MZ-1-bar of the first Mach-Zehnder interference type optical intensity modulation means MZ-1. Type clock signal light is used as first clock signal light for phase modulation driving, and is provided on each of the two first interference arms in the first Mach-Zehnder interference type light intensity modulation means MZ-1. RZ which is input from the first optical input port P-MZ-1-1 and propagates through the two first interference arms by being input to one phase modulation means R1-1 and L1-1. Phase difference is generated in the clock signal light,
At the same time, the light is output from one of the two second optical output ports P-MZ-2-cross and P-MZ-2-bar of the second Mach-Zehnder interference type light intensity modulating means MZ-2. RZ type clock signal light is provided as second clock signal light for phase modulation driving, and is provided on each of the two second interference arms in the second Mach-Zehnder interference type light intensity modulation means MZ-2. RZ type clock that is input from the second optical input port P-MZ-2-1 and propagates through the two second interference arms by being input to the second phase modulation means R2 and L2. Create a phase difference in the signal light,
Further, the light is output from one of the two second light output ports P-MZ-2-cross and P-MZ-2-bar of the second Mach-Zehnder interference type light intensity modulation means MZ-2. RZ type clock signal light is used as third clock signal light for phase modulation driving, one at each of the two first interference arms behind the first phase modulation means R1-1 and L1-1. By inputting to the provided third phase modulation means R1-2 and L1-2, the phase modulation is performed by the first phase modulation means R1-1 and L1-1 and the two first interference arms are passed through. A phase difference is caused in the propagating RZ type clock signal light,
The entire high-speed chaotic optical signal generation optical circuit is integrated with an optical semiconductor, or the first phase modulation means R1-1 and L1-1, the second phase modulation means R2 and L2, and the third phase modulation means. A portion excluding the phase modulation means R1-2 and L1-2 is configured by a PLC, and the first phase modulation means R1-1 and L1-1, the second phase modulation means R2 and L2, and the third phase modulation means R1-2 and L1-2. The phase modulation means R1-2 and L1-2 are made of optical semiconductors, and the entire high-speed chaotic optical signal generating optical circuit is made of a hybrid of PLC and optical semiconductor, or the first phase modulation means R1-1. , L1-1, the second phase modulation means R2, L2, and the third phase modulation means R1-2, L1-2 are configured by photonic crystal waveguides, and the first phase modulation is performed. Means R1-1, L1-1 and the second phase modulation hand R2, L2 and the third phase modulation means R1-2, quantum dot groups using the configuration embedded in the core layer, fabricated by integrating the entire high-speed chaotic optical signal generating optical circuit as L1-2,
Output signal light is output from either one of the two first optical output ports P-MZ-1-cross and P-MZ-1-bar of the first Mach-Zehnder interference type optical intensity modulation means MZ-1. A method for generating a high-speed chaotic optical signal. The high-speed chaotic optical signal generation method according to claim 5,
The RZ type clock signal light used as the first clock signal light for phase modulation driving is an RZ type clock signal light output from the same optical output port as the output signal light. Optical signal generation method. The high-speed chaotic optical signal generation method according to claim 5,
The RZ type clock signal light used as the first clock signal light for phase modulation driving is an RZ type clock signal light output from an optical output port different from the output signal light. Signal generation method. The high-speed chaotic optical signal generation method according to claim 5,
The RZ type clock signal light used as the second clock signal light for phase modulation driving and the RZ type clock signal light used as the third clock signal light for phase modulation driving are sent from the same optical output port. A high-speed chaotic optical signal generation method, characterized in that the RZ-type clock signal light is output. The high-speed chaotic optical signal generation method according to claim 5,
The RZ type clock signal light used as the second clock signal light for phase modulation driving and the RZ type clock signal light used as the third clock signal light for phase modulation driving are output from different optical output ports. A high-speed chaotic optical signal generation method, characterized in that it is an RZ type clock signal light.

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