CN108155945B - Chaos multi-party annular bidirectional communication system based on phase shift on-off keying - Google Patents

Abstract

The invention discloses a chaotic multi-party ring-shaped two-way communication system based on phase shift switch keying, comprising three lasers, the chaotic carrier frequency of each laser is divided into two beams of optical signals, and the two beams of optical signals are respectively connected to a circulator. The first port, the third port of the circulator is connected to the fourth port of the circulator after passing through the optical coupler and the photoelectric modulator; the second port of the circulator is connected to the part of the optical transmission mirror, the beam splitter and the optical amplifier in sequence. The adjacent said optical coupler; the said beam splitter will send part of the light into the photodetector. The invention utilizes optical devices to realize chaotic communication, and has the characteristics of low cost, stable performance, low bit error rate, strong confidentiality and the like.

Description

Chaotic multi-party ring two-way communication system based on phase-shift keying

technical field

The invention belongs to the technical field of optical information, and in particular relates to a chaotic multi-party annular two-way communication system based on phase-shift keying.

Background technique

Chaos is a definite quasi-random process, and chaos has broad prospects in secure communication, image encryption and signal detection.

After a novelty search, the prior art does not involve a two-way communication technology with relays.

Based on the above status quo, this application proposes a chaotic multi-party ring bidirectional communication system based on ON/OFF phase shift keying, which is embodied in the ring network. Through the ON/OFF phase shift keying technology, each laser site can realize data transmission. Add-drop multiplexing. This technology can ensure that the decrypted signal has a very low bit error rate and a high signal-to-noise ratio.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the present invention proposes a chaotic multi-party annular two-way communication system based on phase-shift keying. The communication system of the invention realizes the bidirectional communication between any two laser sites in the ring network, and has the characteristics of low cost, stable performance, low bit error rate, strong confidentiality and the like.

The present invention adopts following technical scheme:

A chaotic multi-party ring two-way communication system based on phase shift keying, including three lasers, the chaotic carrier frequency of each laser is divided into two beams of optical signals, and the two beams of optical signals are respectively connected to the first port of a circulator, the circulator The third port of the circulator is connected to the fourth port of the circulator after passing through the optical coupler and the photoelectric modulator; the second port of the circulator is connected to the adjacent said Optical coupler; the beam splitter will send a portion of the light to the photodetector.

Preferably, the chaotic carrier frequency of the laser is divided into the two optical signals by a beam splitter.

Preferably, the splitting ratio of the second beam splitter is 50:50.

Preferably, the electro-optical negative feedback coefficient of the partial light transmission mirror is 0.35.

Preferably, the optical feedback time delay of the two lasers is 2.5 nanoseconds.

Preferably, the bias current of the laser is 17.5mA.

Preferably, the number of transparent carriers of the laser is 1.25×10 ⁸ .

Preferably, the center wavelength of the chaotic carrier frequency light wave is 1550 nm. In the system of the present invention, each laser acts as both a transmitter and a receiver. Each laser is used as a transmitter, and its splitter divides the chaotic carrier frequency of the laser into two beams of optical signals, which are respectively transmitted to two circulators. The circulator, optical amplifier, and circulator are coupled to the next laser; a part of the feedback signal passes through the circulator, and the chaotic carrier frequency partially transmitted by another laser is combined into one channel by the coupler, and the RF signal is turned on by the modulator. /OFF phase shift keying modulation, after passing through the circulator, it is fed back to the transmitting laser, so that the information is hidden in the chaotic carrier frequency. When both ends send "0" or "1", the two lasers are synchronized; otherwise, the two lasers are synchronized. Asynchronous state. In the decoding process, the photoelectric detector is used to detect the power synchronization error of the lasers at both ends, and then the operation is performed with the local signal to decrypt the bits transmitted by the sender and realize bidirectional communication between any two lasers in the ring link.

The present invention provides basic conditions for future chaotic optical communication based on the chaotic multi-party annular two-way communication system based on phase shift key control. The generation of chaotic carrier frequency in the system and the synchronization of the system are the core technologies of the system, and the successful decryption of information is the chaotic communication. It will have huge application potential in the future chaotic secure high-speed communication network.

Description of drawings

FIG. 1 is a schematic structural diagram of a chaotic multi-party annular two-way communication system based on phase-shift keying according to the present invention. mi(t) (i=1,2,...6) is the modulation signal.

Figure 2 shows the chaotic signals generated by three lasers. Here, the first laser is used as the sending end, the second laser is used as the receiving end, and the three lasers are in a synchronized state.

Figure 3 is a diagram of a transmission signal. Taking the first laser as the transmitter, Figure 3 shows the bits of the transmitter.

Figure 4 is a diagram of a decoded signal. Taking the second laser as the receiving end, the synchronization errors detected by the first and second lasers are calculated with the local bits of the second laser to decode the signal of the sending end of the first laser.

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , the chaotic multi-party annular two-way communication system based on phase shift keying in this embodiment includes a first laser 1-1, a second laser 1-2, a third laser 1-3, and a first circulator 2- 1. The second circulator 2-2, the third circulator 2-3, the fourth circulator 2-4, the fifth circulator 2-5, the sixth circulator 2-6, the first partial light transmission mirror 3-1 , the second partial light transmission mirror 3-2, the third partial light transmission mirror 3-3, the fourth partial light transmission mirror 3-4, the fifth partial light transmission mirror 3-5, the sixth partial light transmission mirror 3-6 , the first beam splitter 4-1, the second beam splitter 4-2, the third beam splitter 4-3, the fourth beam splitter 4-4, the fifth beam splitter 4-5, the sixth beam splitter 4-6, first optical coupler 5-1, second optical coupler 5-2, third optical coupler 5-3, fourth optical coupler (-4, fifth optical coupler 5-5, Sixth optocoupler 5-6, first optoelectronic modulator 6-1, second optoelectronic modulator 6-2, third optoelectronic modulator 6-3, fourth optoelectronic modulator 6-4, fifth optoelectronic modulator 6-5, the sixth photoelectric modulator 6-6, the first photodetector 7-1, the second photodetector 7-2, the third photodetector 7-3, the fourth photodetector 7-4, the Five photodetectors 7-5, sixth photodetectors 7-6, first optical amplifier 8-1, second optical amplifier 8-2, third optical amplifier 8-3, fourth optical amplifier 8-4, The fifth optical amplifier 8-5 and the sixth optical amplifier 8-6. The connection relationship of each component is as follows:

The first laser 1-1 is divided into two paths by a 50/50 beam splitter, and one path is connected to the a1 port of the first circulator 2-1, the b1 port of the first circulator 2-1 and the first partial light transmission mirror 3-1. One end is connected, the other end of the first partial light transmission mirror 3-1 is connected with one end of the first beam splitter 4-1, the first beam splitter 4-1 sends a part of the light into the first photodetector 7-1, the first The other end of the beam splitter 4-1 is connected to the first end of the first optical amplifier 8-1, the second end of the first optical amplifier 8-1 is connected to the first optical coupler 5-1, and the first optical coupler 5 The other end of -1 is connected to the first optoelectronic modulator 6-1, the first optoelectronic modulator 6-1 is connected to the d2 port of the second circulator 2-2, and the c2 port of the second circulator 2-1 is connected to the first optical amplifier 8-1 second end.

The c1 port of the first circulator 2-1 is connected to the d1 port of the first circulator 2-1 through the second optical coupler 5-2 and the second optical modulator 6-2.

The other channel of the first laser 1-1 is connected to the a3 port of the sixth circulator 2-6, and the b3 port of the sixth circulator 2-6 is sequentially connected to the sixth beam splitter through the sixth partial light transmission mirror 3-6 At one end of 4-6, the sixth beam splitter 4-6 sends part of the light into the sixth photodetector 7-6, and the other end of the sixth split beam 4-6 is coupled through the sixth optical amplifier 8-6. The sixth photoelectric modulator 6-6 of the device 5-6 is connected to the d6 port of the fifth circulator 2-5.

The c3 port of the sixth circulator 2-6 is connected to one end of the fifth optical coupler 5-5, and the other end of the fifth optical coupler 5-5 is connected to the sixth circulator 2 through the sixth photoelectric modulator 6-5 -6 for the d3 port.

The c6 port of the fifth circulator 2-5 is connected to one end of the sixth optical coupler 5-6. The b5 port of the fifth circulator 2-5 is connected to one end of the fifth beam splitter 4-5 through the fifth partial light transmission mirror 3-5, and the fifth beam splitter 4-5 sends a part of the light into the fifth photoelectric detection The other end of the fifth beam splitter 4-5 is connected to the fifth optical coupler 5-5 after passing through the fifth optical amplifier 8-5.

The second laser 1-2 is divided into two paths by a 50/50 beam splitter, one is connected to the a2 port of the second circulator 2-2, and the b2 port of the second circulator 2-2 passes through the second partial light transmission mirror 3-2 One end of the second beam splitter 4-2 is connected, the second beam splitter 4-2 sends part of the light into the second photodetector 7-2, and the other end of the second beam splitter 4-2 passes the second light The amplifier 8-2 is connected to one end of the second optical coupler 5-2 (connected to the c1 port).

The other channel of the second laser 1-2 is connected to the b2 port of the third circulator 2-3.

The third laser 1-3 is divided into two channels by a 50/50 beam splitter, and one is connected to the a6 port of the fifth circulator 2-5; the other is connected to the a5 port of the fourth circulator 2-4, and the b5 port is connected to the third circulator 2-4. Part of the light transmission mirror 3-3 is connected to one end of the third beam splitter 4-3, the third beam splitter 4-3 sends part of the light into the third photodetector 7-3, and the third beam splitter 4-3 The other end is connected to the a4 port of the third circulator 2-3 through the third optical amplifier 8-3, the third optical coupler 5-3, and the third photoelectric modulator 6-3.

The c5 port of the fourth circulator 2-4 is connected to the d5 port of the fourth circulator through the fourth optical coupler 5-4 and the fourth photoelectric modulator 6-5.

The d4 port of the third circulator 2-3 is connected to one end of the third optical coupler 5-3. The c4 port of the third circulator 2-3 is connected to one end of the fourth beam splitter 4-4 through the fourth partial light transmission mirror 3-4, and the fourth beam splitter 4-4 sends part of the light into the fourth photoelectric detection The other end of the fourth beam splitter 4-4 is connected to one end of the fourth optical coupler 5-4 through the fourth amplifier 8-4.

When communicating between the first laser 1-1 and the second laser 1-2, a 50/50 beam splitter is used to divide the chaotic carrier frequency emitted by the first laser (1-1) into two paths, and one path is connected to the The a1 port of the first circulator 2-1 and the b1 port of the first circulator 2-1 are connected to one end of the first partial optical transmission mirror 3-1 through an optical fiber, and a part of the optical signal is reflected to the first circulator 2-1 The b1 port of the first circulator flows out from the c1 port of the first circulator 2-1. The other end of the first partial light transmission mirror 3-1 is connected to one end of the first beam splitter 4-1, and another part of the light is input to the first beam splitter 4-1, and the first beam splitter 4-1 will A part of the light is sent to the first photodetector 7-1 for detecting the optical power of the first laser 1-1, and the other end of the first beam splitter 4-1 is connected to one end of the first optical amplifier 8-1 to connect The optical signal is amplified. Similarly, a 50/50 beam splitter is used to divide the chaotic carrier frequency emitted by the second laser 1-2 into two channels, and one channel is connected to the a2 port of the second circulator 2-2 through an optical fiber. The second circulator 2-2 The b2 port is connected to one end of the second partial optical transmission mirror 3-2 through an optical fiber, and a part of the optical signal is reflected to the b2 port of the second circulator 2-2, and flows out from the c2 port of the second circulator 2-2 . The other end of the second partial light transmission mirror 3-2 is connected to one end of the second beam splitter 4-2, and another part of the light is input to the second beam splitter 4-2, and the second beam splitter 4-2 will A part of the light is sent to the second photodetector 7-2 to detect the optical power of the second laser 1-2, and the other end of the second beam splitter 4-2 is connected to one end of the second optical amplifier 8-2, and the The optical signal is amplified.

The signal amplified by the first optical amplifier 8-1 and the signal from the c2 port of the second circulator 2-2 are combined into one through the first coupler 5-1, and the other end of the first coupler 5-1 is connected to the first coupler 5-1. One end of the phase modulator 6-1 is connected, the other end of the first phase modulator 6-1 is connected to the d2 port of the second circulator 2-2, from the first laser 1-1 and the second laser 1-2 are respectively Coupling and feedback to the second laser 1-2. Similarly, the signal amplified by the second optical amplifier 8-2 and the signal from the c1 port of the first circulator 2-1 are combined into one through the second coupler 5-2, and the other end of the second coupler 5-2 is connected to the One end of the second phase modulator 6-2 is connected, and the other end of the second phase modulator 6-2 is connected to the d1 port of the first circulator 2-1, from the second laser 1-2 and the second laser 1-1 are coupled and fed back to the first laser 1-1, respectively. In addition, the connections between the laser 1-1 and the laser 1-3 and between the laser 1-2 and the laser 1-3 are similar, which can be referred to above.

For the connection between more than three lasers, such a ring network connection is similarly formed, and services are added, dropped and multiplexed at each site.

混沌载频光波的中心波长为1550nm。In this embodiment, the optical feedback time delays of the first laser and the second laser are both 2.5 nanoseconds. The threshold current of all three lasers is 17.5mA. The number of transparent carriers in the laser is 1.25×10 ⁸ . The splitting ratio of the beam splitter is 50:50. The emission coefficient of the partial mirror is

The center wavelength of the chaotic carrier frequency light wave is 1550nm.

The present invention is based on the realization process of the ON/OFF phase shift keying chaotic multi-party annular two-way communication system:

Three lasers are used as transmitter and receiver respectively. When used as the transmitting end, its beam splitter divides the chaotic signal of the laser into two optical signals, both of which pass through the circulator, part of the light is fed back to the transmitting laser through the transmission mirror, and the other part of the transmitted light is amplified and combined with the signal from the receiver end. The feedback light is coupled together into the corresponding receiving laser.

In the technical solution of the present invention, the phase of the feedback light and a part of the transmitted light from the transmitting end is subjected to ON/OFF phase shift keying modulation through the phase modulator, and then hidden in the chaotic carrier frequency. Both lasers transmit "0" or When "1", the two lasers are synchronized, otherwise, they are in an asynchronous state. In the decoding process, the power error of the lasers at both ends is detected, and then the operation is performed with the local signal, so that the bits transmitted by the sender can be decrypted, and the two-way communication between any two lasers in the ring network can be realized. A brief summary is as follows:

1. Coupling and feedback are realized between the lasers through some optical transmission mirrors, and finally chaos synchronization is realized.

2. When two ends transmit different bits, there is a synchronization error.

3. The signal transmitted by the sending end is recovered according to the operation of the synchronization error and the local signal.

The invention utilizes the chaotic principle, and compares the detected optical power difference with the local signal during decoding to restore the information to be transmitted, which increases the confidentiality of the system. Even if the signal is intercepted during transmission, there is no clue to know The information sent by either party cannot successfully decode the bit information to be transmitted by the sender.

The invention utilizes optical devices to realize chaotic communication, and has the characteristics of low cost, stable performance, low bit error rate, strong confidentiality and the like.

The preferred embodiments and principles of the present invention have been described in detail above. For those of ordinary skill in the art, according to the ideas provided by the present invention, there will be changes in the specific embodiments, and these changes should also be regarded as the present invention. scope of protection.

Claims (6)

1. The chaotic multi-party annular bidirectional communication system based on phase shift on-off keying is characterized by comprising: the device comprises a first laser (1-1), a second laser (1-2), a third laser (1-3), a first circulator (2-1), a second circulator (2-2), a third circulator (2-3), a fourth circulator (2-4), a fifth circulator (2-5), a sixth circulator (2-6), a first part light transmission mirror (3-1), a second part light transmission mirror (3-2), a third part light transmission mirror (3-3), a fourth part light transmission mirror (3-4), a fifth part light transmission mirror (3-5), a sixth part light transmission mirror (3-6), a first beam splitter (4-1), a second beam splitter (4-2), a third beam splitter (4-3), a fourth beam splitter (4-4), A fifth beam splitter (4-5), a sixth beam splitter (4-6), a first optical coupler (5-1), a second optical coupler (5-2), a third optical coupler (5-3), a fourth optical coupler (5-4), a fifth optical coupler (5-5), a sixth optical coupler (5-6), a first photoelectric modulator (6-1), a second photoelectric modulator (6-2), a third photoelectric modulator (6-3), a fourth photoelectric modulator (6-4), a fifth photoelectric modulator (6-5), a sixth photoelectric modulator (6-6), a first photoelectric detector (7-1), a second photoelectric detector (7-2), a third photoelectric detector (7-3), a fourth photoelectric detector (7-4), A fifth photoelectric detector (7-5), a sixth photoelectric detector (7-6), a first optical amplifier (8-1), a second optical amplifier (8-2), a third optical amplifier (8-3), a fourth optical amplifier (8-4), a fifth optical amplifier (8-5) and a sixth optical amplifier (8-6), wherein the connection relations are as follows:

the first laser (1-1) passes 50: the 50 beam splitter is divided into two paths, the first path is connected with a first port (a1) of a first circulator (2-1), a second port (b1) of the first circulator (2-1) is connected with a first end of a first part light transmission mirror (3-1), a second end of the first part light transmission mirror (3-1) is connected with a first end of a first beam splitter (4-1), the first beam splitter (4-1) sends a part of light to a first photoelectric detector (7-1), a second end of the first beam splitter (4-1) is connected with a first end of a first optical amplifier (8-1), a second end of the first optical amplifier (8-1) is connected with a first end of a first optical coupler (5-1), a second end of the first optical coupler (5-1) is connected with a first photoelectric modulator (6-1), the first photoelectric modulator (6-1) is connected with the fourth port (d2) of the second circulator (2-2), and the third port (c2) of the second circulator (2-1) is connected with the second end of the first optical amplifier (8-1);

the third port (c1) of the first circulator (2-1) is connected to the fourth port (d1) of the first circulator (2-1) through the second optical coupler (5-2) and the second optical modulator (6-2);

the second path of the first laser (1-1) is connected into a first port (a3) of a sixth circulator (2-6), a second port (b3) of the sixth circulator (2-6) is connected into a first end of a sixth beam splitter (4-6) through a sixth part of light transmission mirror (3-6) in sequence, the sixth beam splitter (4-6) sends a part of light into a sixth photoelectric detector (7-6), and a second end of the sixth beam splitter (4-6) is connected into a fourth port (d6) of the fifth circulator (2-5) after passing through a sixth optical amplifier (8-6), a sixth optical coupler (5-6) and a sixth photoelectric modulator (6-6);

a third port (c3) of the sixth circulator (2-6) is connected with a first end of a fifth optical coupler (5-5), and a second end of the fifth optical coupler (5-5) is connected into a fourth port (d3) of the sixth circulator (2-6) after passing through a sixth photoelectric modulator (6-5);

the third port (c6) of the fifth circulator (2-5) is connected to the first end of the sixth optical coupler (5-6); a second port (b5) of the fifth circulator (2-5) is connected to a first end of a fifth beam splitter (4-5) through a fifth partial light transmission mirror (3-5), the fifth beam splitter (4-5) sends a part of light to a fifth photodetector (7-5), and a second end of the fifth beam splitter (4-5) is connected to a fifth optical coupler (5-5) after passing through a fifth optical amplifier (8-5);

the second laser (1-2) passes 50: the 50 beam splitter is divided into two paths, the first path is connected with a first port (a2) of a second circulator (2-2), a second port (b2) of the second circulator (2-2) is connected to a first end of a second beam splitter (4-2) through a second part of light transmission mirror (3-2), the second beam splitter (4-2) sends a part of light to a second photoelectric detector (7-2), and a second end of the second beam splitter (4-2) is connected to a first end of a second optical coupler (5-2) after passing through a second optical amplifier (8-2);

a second path of the second laser (1-2) is connected to a second port (b2) of the third circulator (2-3);

the third laser (1-3) passes 50: the 50 beam splitter is divided into two paths, and the first path is connected with a first port (a6) of a fifth circulator (2-5); the second path is connected with a first port (a5) of a fourth circulator (2-4), a second port (b5) is connected to a first end of a third beam splitter (4-3) through a third part of light transmission mirror (3-3), the third beam splitter (4-3) sends a part of light to a third photoelectric detector (7-3), and a second end of the third beam splitter (4-3) is connected to a first port (a4) of the third circulator (2-3) after passing through a third optical amplifier (8-3), a third optical coupler (5-3) and a third photoelectric modulator (6-3);

the third port (c5) of the fourth circulator (2-4) is connected to the fourth port (d5) of the fourth circulator through a fourth optical coupler (5-4) and a fourth photoelectric modulator (6-5);

the fourth port (d4) of the third circulator (2-3) is connected to the first end of the third optical coupler (5-3); the third port (c4) of the third circulator (2-3) is connected to the first end of the fourth beam splitter (4-4) through a fourth partially light-transmitting mirror (3-4), the fourth beam splitter (4-4) sends a part of light to a fourth photodetector (7-4), and the second end of the fourth beam splitter (4-4) is connected to the first end of a fourth optical coupler (5-4) through a fourth amplifier (8-4).

2. The chaotic multi-party ring bi-directional communication system based on phase shift on-off keying as claimed in claim 1, wherein: the electro-optic negative feedback coefficient of the partial light transmission mirror is 0.35.

3. The chaotic multi-party ring bi-directional communication system based on phase shift on-off keying as claimed in claim 2, wherein: wherein the optical feedback time delay of both said lasers is 2.5 nanoseconds.

4. The chaotic multi-party ring bi-directional communication system based on phase shift on-off keying as claimed in claim 1, wherein: the bias current of the laser was 17.5 mA.

5. The chaotic multi-party ring bi-directional communication system based on phase shift on-off keying according to claim 1 or 4, wherein: the number of transparent carriers of the laser is 1.25 × 108.

6. The chaotic multi-party ring bi-directional communication system based on phase shift on-off keying as claimed in claim 1, wherein: the central wavelength of the chaotic carrier frequency optical wave is 1550 nm.

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