WO2017050053A1 - Light-emitting apparatus and emitting method, and light-receiving apparatus and receiving method - Google Patents

Abstract

Disclosed are a light-emitting apparatus and emitting method and a light-receiving apparatus and receiving method. A light-emitting module in the light-emitting apparatus comprises an optical carrier generation module which is used for generating a modulated optical carrier, the modulated optical carrier comprising a first modulated optical carrier and a second modulated optical carrier; an electro-optical modulator which is used for modulating a baseband signal to the first modulated optical carrier to generate a first path of optical signal; a low frequency band microwave source which is used for generating a microwave signal, the microwave signal using MHz or KHz as a unit of frequency adjustment; a frequency fine adjuster which is used for modulating the microwave signal to the second modulated optical carrier to generate a second path of optical signal; and a light radio frequency emitting module which is used for combining the first path of optical signal and the second path of optical signal into a third path of optical signal and emitting the third path of optical signal. In this solution, the microwave signal uses MHz or KHz as a unit of frequency adjustment, which improves the adjustment precision, such that a radio frequency carrier signal can be emitted at any frequency point.

Description

Light emitting device, transmitting method, light receiving device and receiving method

This application claims priority to Chinese Patent Application No. 201510624638.7, entitled "Light Emitting Device, Transmitting Method, Light Receiving Device, and Receiving Method", filed on September 25, 2015, and in 2016 Priority of the Chinese Patent Application entitled "Light Emitting Device, Transmitting Method, Light Receiving Device, and Receiving Method", filed on April 26, the Chinese Patent Office, No. 201610264795.6, the entire contents of which are incorporated herein by reference. in.

Technical field

The present invention relates to the field of optical communication technologies, and in particular, to a light emitting device, a transmitting method, a light receiving device, and a receiving method.

Background technique

With the development of wireless communication technology, the bandwidth and carrier frequency are continuously improved. The local oscillator signal generated by the traditional electrical method from 60 GHz to 100 GHz needs to be multiplied frequently, the circuit structure is complex and the power consumption is huge, especially in supporting the multi-channel communication system. In order to ensure carrier coherence, it is necessary to divide the local oscillator signal multiple times, and the complexity is high. Therefore, with the increasing complexity of high-frequency (above 30 GHz) optical communication systems, it is urgent to find a kind of complexity reduction. Optical communication system.

The current optical communication systems mainly use the following technologies:

A photo-millimeter-wave technology: an optical carrier of a single-tone optical frequency of ω ₀ output by a laser source, which is input to an input of an MZM (Mach-Zehnder Modulator), and at the same time, an external A local oscillator signal with a frequency of ω _m is also input to the MZM. By appropriately biasing the MZM, the output signal of the MZM becomes two spectral lines of frequencies ω ₀ -ω _m and ω ₀ +ω _m , respectively. The two spectral lines of the MZM output are input into an EDFA (Erbium-doped Optical Fiber Amplifier) to amplify the optical power, and then the output signal of the EDFA is input into the optical fiber to realize long-distance transmission of the optical signal. The output end of the optical fiber is connected to a photodetector PD (Photo Diode), and generates a radio frequency carrier signal with a frequency of 2ω _m through the PD beat frequency, and then amplifies and filters the signal, and finally is transmitted by the antenna;

The other is a silicon-micro-nano optical comb technology. The single-tone optical signal output from the pump source enters the micro-nano resonator to generate cascade stimulated Brillouin oscillation. The micro-nano resonator radius guarantees the free spectral range. Consistent with the Brillouin frequency, resulting in equally spaced spectral lines at the output of the udisk.

However, the optical signal generated by the above two technologies has limited ability to adjust the frequency of the optical signal, and the frequency modulation accuracy is low. Generally, the GHz level is adjusted, and adjustments like the MHz or KHz level cannot be achieved.

Summary of the invention

The embodiments of the present invention provide a light emitting device, a transmitting method, a light receiving device, and a receiving method, which are used to solve the problem of low adjustment precision existing in the prior art.

In a first aspect, a light emitting module is provided, comprising:

An optical carrier generating module, configured to generate a modulated optical carrier, where the modulated optical carrier includes a first modulated optical carrier and a second modulated optical carrier;

An electro-optic modulator for modulating a baseband signal onto the first modulated optical carrier to generate a first optical signal;

a low-band microwave source for generating a microwave signal, the microwave signal being adjusted in units of frequency of MHz or KHz;

a frequency fine adjuster for modulating the microwave signal onto the second modulated optical carrier to generate a second optical signal;

The optical RF transmitting module is configured to combine the first optical signal and the second optical signal into a third optical signal, and transmit the third optical signal.

With reference to the first aspect, in a first possible implementation, the optical carrier generating module includes a pump laser source for generating an initial modulated optical carrier;

The optical carrier generation module further includes a micro-nano resonator and an arrayed waveguide grating, wherein:

The micro-nano resonator is configured to adjust the initial modulated optical carrier to a modulated optical carrier of equal frequency spacing;

The arrayed waveguide grating is configured to perform frequency domain separation on the equal frequency interval modulated optical carriers, where the separated modulated optical carriers comprise the first modulated optical carrier and the second modulated optical carrier.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in a second possible implementation, the frequency fine modulator modulates the microwave signal to the second modulated optical carrier ,Specifically:

The frequency fine adjuster uses a Mach-Zehnder modulator MZM to modulate the microwave signal onto the second modulated optical carrier.

In a second aspect, there is provided an optical transmitter comprising the at least one light emitting module and the at least one photodetector according to the first aspect, or the first to second possible implementations of the first aspect, The number of the at least one photodetector is the same as the number of the at least one light emitting module; each of the at least one light emitting module corresponds to one photodetector, respectively, in the at least one light emitting module Any two different light emitting modules respectively have different photodetectors;

The photodetector is configured to beat the optical signal emitted by the corresponding optical transmitting module into a radio frequency carrier signal for transmission.

With reference to the second aspect, in a first possible implementation, the optical transmitter includes N light emitting modules, and the N is greater than or equal to 2;

The optical transmitter further includes at least two analog phase shifting units, and any one of the at least two analog phase shifting units corresponds to any one of the N light emitting modules, The light emitting modules corresponding to any two different analog phase shifting units of the at least two analog phase shifting units are different, and any one of the at least two analog phase shifting units is used for The baseband signal of the corresponding light emitting module is phase-adjusted so that the signal obtained by synthesizing the phase-adjusted baseband signal is directed to the target direction.

With reference to the second aspect, or the first possible implementation manner of the second aspect, in a second possible implementation manner, the optical transmitter includes N light emitting modules, and the N is greater than or equal to 2;

The optical transmitter further includes an analog beamforming network module for using the N optical emission modes The RF carrier signals generated by the at least two optical transmitting modules in the block are phase-adjusted such that the signals obtained by synthesizing the phase-adjusted RF carrier signals are directed to the target direction.

In a third aspect, a light receiving module is provided, including:

An optical radio frequency receiving module, configured to receive a radio frequency carrier signal;

An optical carrier generating module, configured to generate a modulated optical carrier, where the modulated optical carrier includes a first modulated optical carrier and a second modulated optical carrier;

a low-band microwave source for generating a microwave signal, the microwave signal being adjusted in units of MHz or KHz;

a frequency fine adjuster for modulating the microwave signal onto the first modulated optical carrier to generate an optical signal;

a photodetector for scrambling the optical signal and the second modulated optical carrier to generate a local oscillator signal;

The optical radio frequency receiving module is further configured to perform frequency adjustment on the radio frequency carrier signal according to the local oscillator signal.

With reference to the third aspect, in a first possible implementation, the optical carrier generating module includes a pump laser source, configured to generate an initial modulated optical carrier;

The optical carrier generation module further includes a micro-nano resonator and an arrayed waveguide grating, wherein:

The micro-nano resonator is configured to adjust the initial modulated optical carrier to a modulated optical carrier of equal frequency spacing;

The arrayed waveguide grating is configured to perform frequency domain separation on the equal frequency interval modulated optical carriers, where the separated modulated optical carriers comprise the first modulated optical carrier and the second modulated optical carrier.

With reference to the third aspect, or the first possible implementation manner of the third aspect, in a second possible implementation, the frequency fine adjuster modulates the microwave signal to the first modulated optical carrier ,Specifically:

The frequency fine adjuster uses a Mach-Zehnder modulator MZM to modulate the microwave signal onto the first modulated optical carrier.

In a fourth aspect, there is provided an optical receiver comprising the at least one light receiving module of any one of the first to second possible implementations of the third aspect.

With reference to the fourth aspect, in a first possible implementation, the optical receiver includes N optical receiving modules, where N is greater than or equal to 2;

The optical receiver further includes at least two analog phase shifting units, and any one of the at least two analog phase shifting units corresponds to any one of the N light receiving modules, The light receiving modules corresponding to any two different analog phase shifting units of the at least two analog phase shifting units are different, and any one of the at least two analog phase shifting units is used for The phase adjustment of the local oscillator signal of the corresponding light receiving module is performed such that the signal obtained by synthesizing the RF carrier signal whose frequency is adjusted by the phase adjusted local oscillator signal is directed to the target direction.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation, the optical receiver further includes an analog beamforming network module, configured to receive the N light The RF carrier signals received by the at least two optical receiving modules in the module are phase-shifted, so that the signals obtained by synthesizing the phase-adjusted RF carrier signals are directed to the target direction.

A fifth aspect provides a method for transmitting an optical signal, including:

The optical transmitting module generates a modulated optical carrier, where the modulated optical carrier includes a first modulated optical carrier and a second modulated optical carrier;

The light emitting module modulates a baseband signal onto the first modulated optical carrier to generate a first optical signal;

The light emitting module generates a microwave signal, and the microwave signal is adjusted in units of frequency of MHz or KHz;

The light emitting module modulates the microwave signal onto the second modulated optical carrier to generate a second optical signal;

The light emitting module combines the first road light signal and the second road light signal into a third road light signal, and transmits the third road light signal.

In conjunction with the fifth aspect, in a first possible implementation, the light emitting module generates a modulation Optical carrier, including:

The light emitting module generates an initial modulated optical carrier;

After the optical transmitting module generates the initial modulated optical carrier, and before modulating the baseband signal to the first modulated optical carrier, the method further includes:

The optical transmitting module adjusts the initial modulated optical carrier to a modulated optical carrier of equal frequency interval;

The optical transmitting module performs frequency domain separation on the modulated optical carriers of the equal frequency interval, and the separated modulated optical carriers include the first modulated optical carrier and the second modulated optical carrier.

With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, in a second possible implementation, the optical transceiver module modulates the microwave signal to the second modulated optical carrier, including :

The light emitting module employs a Mach-Zehnder modulator MZM to modulate the microwave signal onto the second modulated optical carrier.

According to a sixth aspect, a method for transmitting a radio frequency carrier signal is provided, which is applied to an optical transmitter, where the optical transmitter includes at least one light emitting module and at least one photodetector, wherein the number and location of the at least one photodetector The number of the at least one light emitting module is the same; each of the at least one light emitting module corresponds to one photodetector, and any two different light emitting modules of the at least one light emitting module Corresponding photodetectors are different;

Any one of the at least one light emitting module adopting the transmitting optical signal of the method of any one of the first aspect or the second possible implementation manner of the fifth aspect;

The photodetector beats the received optical signal into a radio frequency carrier signal for transmission.

With reference to the sixth aspect, in a first possible implementation, the optical transmitter includes N optical transmitting modules, and the N is greater than or equal to 2; the optical transmitter further includes at least two analog phase shifting units, Any one of the at least two analog phase shifting units corresponding to any one of the N light emitting modules, and any two of the at least two analog phase shifting units are different The light-emitting modules corresponding to the analog phase shifting units are different;

The method further includes:

The analog phase shifting unit of the at least two analog phase shifting units performs phase adjustment on the baseband signal of the corresponding light emitting module, so that the signal obtained by combining the phase adjusted baseband signals is directed to the target direction.

With reference to the sixth aspect, or the first possible implementation manner of the sixth aspect, in a second possible implementation manner, the optical transmitter includes N light emitting modules, and the N is greater than or equal to 2;

The method further includes:

The optical beam transmitter includes: an analog beamforming network module that performs phase adjustment on a radio frequency carrier signal generated by at least two of the N optical transmitting modules, so that a signal obtained by synthesizing the phase adjusted RF carrier signal is directed Target direction.

A seventh aspect provides a radio frequency carrier receiving method, where the optical receiving module receives a radio frequency carrier signal;

The optical receiving module generates a modulated optical carrier, where the modulated optical carrier includes a first modulated optical carrier and a second modulated optical carrier;

The light receiving module generates a microwave signal, and the microwave signal is adjusted in units of MHz or KHz;

The light receiving module modulates the microwave signal onto the first modulated optical carrier to generate an optical signal;

The light receiving module beats the optical signal and the second modulated optical carrier to generate a local oscillator signal;

The light receiving module performs frequency adjustment on the radio frequency carrier signal according to the local oscillation signal

With reference to the seventh aspect, in a first possible implementation manner, the optical receiving module generates a modulated optical carrier, including:

The light receiving module generates an initial modulated optical carrier;

After the optical receiving module generates the initial modulated optical carrier, and before modulating the microwave signal to the first modulated optical carrier, the method further includes:

The light receiving module adjusts the initial modulated optical carrier to a modulated optical load of equal frequency interval wave;

The optical receiving module performs frequency domain separation on the modulated optical carriers of the equal frequency interval, and the separated modulated optical carriers include the first modulated optical carrier and the second modulated optical carrier.

With reference to the seventh aspect, or the first possible implementation manner of the seventh aspect, in a second possible implementation, the optical receiving module modulates the microwave signal to the first modulated optical carrier, including :

The light receiving module uses a Mach-Zehnder modulator MZM to modulate the microwave signal onto the first modulated optical carrier.

According to an eighth aspect, a radio frequency carrier signal receiving method is provided for use in an optical receiver, the optical receiver adopting any one of the first to second possible implementations of the seventh aspect, or the seventh aspect Said method.

With reference to the eighth aspect, in a first possible implementation, the optical receiver includes N optical receiving modules, and the N is greater than or equal to 2; the optical receiver further includes at least two analog phase shifting units, Any one of the at least two analog phase shifting units corresponding to any one of the N light receiving modules, and any two of the at least two analog phase shifting units are different The optical receiving modules corresponding to the analog phase shifting units are different;

The method further includes:

Any one of the at least two analog phase shifting units performs phase adjustment on the local oscillator signal of the corresponding light receiving module, so that the frequency carrier signal synthesis using the phase adjusted local oscillator signal is performed The resulting signal points to the target direction.

With reference to the eighth aspect, or the first possible implementation manner of the eighth aspect, in a second possible implementation manner, the method further includes:

The optical beam receiver includes an analog beamforming network module, and performs phase shift adjustment on a radio frequency carrier signal received by at least two of the N optical receiving modules, so that the phase adjusted RF carrier signal is synthesized. The signal points to the target direction.

In a ninth aspect, a millimeter wave local oscillator source is provided, including:

a pumping laser source for generating a first optical carrier;

An optical microcavity for adjusting the first optical carrier to an optical carrier of equal frequency spacing;

An optical filter, configured to perform frequency domain separation on the optical carriers of the equal frequency intervals, separate a set number of second optical carriers, and combine the second optical carriers to form a second carrier pair ;

a photodetector for scrambling two second optical carriers in each of the second carrier pairs, and forming a millimeter wave corresponding to each of the second carrier pairs after the beat frequency; wherein each of the The frequency of the millimeter wave is the difference between the frequencies of the two second optical carriers in the corresponding second carrier pair.

In conjunction with the ninth aspect, in a first possible implementation, the optical microresonator comprises a microring resonator, a microdisk resonator or a microsphere resonator.

In conjunction with the ninth aspect, or the first possible implementation of the ninth aspect, in a second possible implementation, the optical filter comprises an arrayed waveguide grating AWG, a Bragg grating filter or an optical thin film filter.

With reference to the ninth aspect, or the first possible implementation manner of the ninth aspect, in a third possible implementation, the optical filter specifically includes:

An arrayed waveguide grating AWG, configured to separate a second optical carrier of each of the equal frequency spaced optical carriers;

2x1AWG, configured to combine the second optical carriers in pairs according to the frequency of the millimeter wave to form the second carrier pair.

With reference to the ninth aspect, or the first to third possible implementation manners of the ninth aspect, in the fourth possible implementation, the millimeter wave local oscillator source further includes:

An optical amplifier disposed between the optical filter and the photodetector for amplifying optical power of the second optical carrier.

With reference to the ninth aspect, or the first to fourth possible implementation manners of the ninth aspect, in the fifth possible implementation, the millimeter wave local oscillator source further includes:

An optical circulator disposed between the pump laser source and the optical micro-resonator for inputting a first optical carrier output by the pump laser source to the optical micro-resonator The optical carrier reflected back from the optical microcavity is output from the set port.

In a tenth aspect, a method for generating a millimeter wave is provided, including:

Generating a first optical carrier of a single frequency;

Adjusting the first optical carrier to an optical carrier of equal frequency spacing;

Performing frequency domain separation on the optical carriers of the equal frequency intervals, separating the obtained set number of second optical carriers, and combining the second optical carriers to form a second carrier pair;

Performing beat frequency on two second optical carriers in each of the second carrier pairs, and forming a millimeter wave corresponding to each of the second carrier pairs after the beat frequency; wherein the frequency of each millimeter wave is The difference between the frequencies of the two second optical carriers in the corresponding second carrier pair.

With reference to the tenth aspect, in a first possible implementation, the combining the second optical carriers to form a second carrier pair comprises:

And combining the second optical carriers to form a second carrier pair according to the frequency of the millimeter wave.

With reference to the tenth aspect, or the first possible implementation manner of the tenth aspect, in a second possible implementation manner, before performing frequency scrambling on two second optical carriers in each of the second carrier pairs, Also included is amplifying the optical power of the second optical carrier.

In an embodiment of the present invention, an optical transmitting module is disclosed, including an optical carrier generating module, configured to generate a modulated optical carrier, where the modulated optical carrier includes a first modulated optical carrier and a second modulated optical carrier; and an electro-optic modulator is used to The baseband signal is modulated onto the first modulated optical carrier to generate a first optical signal; the low-band microwave source is used to generate a microwave signal, the microwave signal is adjusted in units of frequency by MHz or KHz; and the frequency fine adjuster is used for microwave The signal is modulated onto the second modulated optical carrier to generate a second optical signal; the optical RF transmitting module is configured to combine the first optical signal and the second optical signal into a third optical signal, and the third optical signal Signal transmission; in this scheme, the microwave signal generated by the low-frequency microwave source is adjusted in units of frequency of MHz or KHz, and the adjustment precision is improved, so that the optical transmission module can transmit the RF carrier signal at any frequency point;

An embodiment of the present invention further provides an optical receiving module, including an optical radio frequency receiving module, configured to receive a radio frequency carrier signal, and an optical carrier generating module, configured to generate a modulated optical carrier, where the modulated optical carrier includes a first modulated optical carrier and a second Modulated optical carrier; low-band microwave source for generating microwave signals, microwave signal in MHz or KHz as frequency adjustment unit; frequency fine-tuner for microwave signal Modulating onto the first modulated optical carrier to generate an optical signal; the photodetector is configured to beat the optical signal and the second modulated optical carrier to generate a local oscillator signal; and the optical RF receiving module is further configured to: according to the local oscillator signal pair The RF carrier signal is frequency-adjusted. In this scheme, the microwave signal generated by the low-band microwave source is adjusted in units of frequency of MHz or KHz, and the adjustment precision is improved, so that the optical receiving module can receive the RF carrier signal at an arbitrary frequency point.

DRAWINGS

1A is a schematic diagram of a light emitting module according to an embodiment of the present invention;

FIG. 1B is a schematic diagram of an optical carrier generating module according to an embodiment of the present invention; FIG.

1C is a schematic diagram of an optical transmitter according to an embodiment of the present invention;

FIG. 1D is another schematic diagram of an optical transmitter according to an embodiment of the present invention; FIG.

FIG. 1E is another schematic diagram of an optical transmitter according to an embodiment of the present invention; FIG.

FIG. 1F is another schematic diagram of an optical transmitter according to an embodiment of the present invention; FIG.

FIG. 1G is another schematic diagram of an optical transmitter according to an embodiment of the present invention; FIG.

2A is a schematic diagram of a light receiving module according to an embodiment of the present invention;

2B is a schematic diagram of an optical carrier generation module according to an embodiment of the present invention;

2C is a schematic diagram of an optical receiver according to an embodiment of the present invention;

2D is another schematic diagram of an optical receiver according to an embodiment of the present invention;

2E is another schematic diagram of an optical receiver according to an embodiment of the present invention;

2F is another schematic diagram of an optical receiver according to an embodiment of the present invention;

2G is another schematic diagram of an optical receiver according to an embodiment of the present invention;

3 is a flowchart of a method for transmitting an optical signal according to an embodiment of the present invention;

4 is a flowchart of a method for transmitting a radio frequency carrier signal according to an embodiment of the present invention;

FIG. 5 is a flowchart of a method for receiving a radio frequency carrier signal according to an embodiment of the present invention; FIG.

6 is a schematic structural diagram of a millimeter wave local oscillator source according to an embodiment of the present invention;

FIG. 7 is another schematic diagram of a millimeter wave local oscillator source according to an embodiment of the present invention; FIG.

FIG. 8 is another schematic diagram of a millimeter wave local oscillator source according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic flow chart of a method for generating millimeter waves according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Additionally, the terms "system" and "network" are used interchangeably herein. The term "and/or" in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations. In addition, the letter "/" in this article generally indicates that the contextual object is an "or" relationship.

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, and the preferred embodiments of the present invention are intended to illustrate and explain the invention, and not to limit the invention, and The embodiments in the application and the features in the embodiments may be combined with each other.

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

As shown in FIG. 1A, in the embodiment of the present invention, a light emitting module 10 is proposed, including:

The optical carrier generating module 100 is configured to generate a modulated optical carrier, where the modulated optical carrier comprises a first modulated optical carrier and a second modulated optical carrier;

An electro-optic modulator 110, configured to modulate a baseband signal onto a first modulated optical carrier to generate a first optical signal;

a low-frequency microwave source 120 for generating a microwave signal, and the microwave signal is adjusted in units of frequency of MHz or KHz;

a frequency fine adjuster 130, configured to modulate a microwave signal onto a second modulated optical carrier to generate a second optical signal;

The optical RF transmitting module 140 is configured to combine the first optical signal and the second optical signal into a third optical signal, and transmit the third optical signal.

In the embodiment of the present invention, optionally, the optical carrier generation module 100 includes a pump laser source 1 for generating an initial modulated optical carrier.

In order to generate any number of equally spaced modulated optical carriers (up to hundreds), and to improve the performance of the output modulated optical carrier, optionally, the optical carrier generating module 100 further includes a micro-nano resonator 2 and an arrayed waveguide. Raster 3, as shown in Figure 1B, where:

a micro-nano resonator 2 for adjusting an initial modulated optical carrier to a modulated optical carrier of equal frequency spacing;

The arrayed waveguide grating 3 is configured to perform frequency domain separation on the equal frequency interval modulated optical carriers, and the separated modulated optical carriers include a first modulated optical carrier and a second modulated optical carrier.

Thus, by using the optical carrier generation module 100 including the pump laser source 1, the micro-nano resonator 2, and the arrayed waveguide grating 3, any number of equally spaced modulated optical carriers (up to hundreds of) can be generated, and the output is The modulated optical carrier has characteristics such as narrow line width and low noise.

In the embodiment of the present invention, the unit adjusted by the frequency of MHz or KHz means that when the frequency is adjusted, the change of the frequency may be a change range of MHz or KHz.

Further, in order to reduce the cost, the pump laser source 1 and the micro-nano resonator 2 may be made of a silicon base.

Of course, other forms of optical carrier generation module 100 may also be used, which will not be described in detail herein.

In the embodiment of the present invention, when the frequency fine adjuster 130 modulates the microwave signal to the second modulated optical carrier, optionally, the following manner may be adopted:

The frequency fine adjuster 130 uses MZM to modulate the microwave signal onto the second modulated optical carrier.

Referring to FIG. 1C, in an embodiment of the present invention, an optical transmitter is provided, including at least one light emitting module 10 and at least one photodetector 11, the number of at least one photodetector 11 and at least one light emitting module 10 The same number, each of the at least one light emitting module 10 corresponding to one photodetector 11 respectively, and any two different light emitting modules 10 of the at least one light emitting module 10 respectively correspond to the photodetectors 11 different, the light signal generated by any one of the at least one light emitting module 10 is emitted to the corresponding photodetector 11;

The photodetector 11 is configured to convert the optical signal emitted by the corresponding optical transmitting module into a radio frequency carrier signal for transmission.

Further, in order to limit the bandwidth occupied by the air interface, the optical transmitter further includes the same number of radio frequency filters 12 as the at least one light emitting module, and each of the at least one light emitting module 10 and the one radio frequency filter respectively Correspondingly, any two different optical transmitting modules 10 of the at least one optical transmitting module 10 respectively have different RF filters 12, and the RF filter 12 is used for filtering the image signals of the RF carrier signal domain, as shown in FIG. 1D. .

Further, in order to ensure coverage, the RF carrier signal is transmitted further; the optical transmitter further includes a power amplifier 13 having the same number as the at least one light emitting module, and each of the at least one light emitting module 10 is respectively associated with A power amplifier 13 corresponds to any two different light emitting modules 10 of the at least one light emitting module 10 respectively corresponding to the power amplifiers 13, and the power amplifiers 13 are used for amplifying the input RF signals, as shown in FIG. 1E.

The optical transmitter mentioned in the embodiment of the present invention may be a single-channel optical transmitter, that is, the optical transmitter includes one optical transmitting module, or, in order to obtain diversity gain, and utilize multi-channel MIMO (Multiple Input Multiple Output) The advantage of the technology is that the optical transmitter can also be a multi-channel optical transmitter, that is, the optical transmitter includes at least two optical transmitting modules.

In the embodiment of the present invention, when the optical transmitter is a multi-channel optical transmitter, that is, the optical transmitter includes N optical transmitting modules, N is greater than or equal to 2; further, in order to enable at least two optical radio transmitting modules 140 to transmit The beam formed by the optical signal generated by the photodetector 11 in the space can be directed to the same target direction, so that the signal is enhanced and the propagation distance is further. Referring to FIG. 1F, the optical transmitter further includes at least two simulations. The phase shifting unit 150, any one of the at least two analog phase shifting units 150 corresponds to any one of the N light emitting modules 10, and the at least two analog phase shifting units 150 The light emitting modules 10 corresponding to any two different analog phase shifting units 150 are different, and any one of the at least two analog phase shifting units 150 is used for the baseband of the corresponding light emitting module 10. The signal is phase-adjusted so that the signal obtained by synthesizing the phase-adjusted baseband signal is directed to the target direction.

In the embodiment of the present invention, the analog phase shifting unit 150 specifically implements phase adjustment by delaying the baseband signal, which is a relatively mature technology, and will not be described in detail herein.

Of course, in order to pass the optical signals emitted by the at least two optical RF transmitting modules 140 through photodetection The beam formed by the RF carrier signal generated by the device 11 can be directed to the same target direction, thereby enhancing the signal and spreading the distance further. The following manner can also be adopted. Referring to FIG. 1G, the optical transmitter further includes analog beamforming. The network module 14 is configured to perform phase adjustment on the radio frequency carrier signal generated by at least two of the N optical transmitting modules, so that the signal obtained by synthesizing the phase-adjusted radio frequency carrier signal is directed to the target direction.

The analog beamforming network module 14 and the analog phase shifting unit 150 may exist in the optical transmitter at the same time. Of course, in order to avoid the complexity of the optical transmitter, the optical transmitter may not include the analog beam when including the analog phase shifting unit 150. The shaping network module 14, or, when including the analog beamforming network module 14, does not include the analog phase shifting unit 150.

In this solution, the frequency spacing of the optical carrier generation module 100 is first set to perform coarse frequency adjustment, and then the frequency is finely adjusted by the external low-band microwave source 120 to improve the mediation accuracy, thereby achieving full-band coverage of the carrier frequency.

The following describes the process of transmitting a radio frequency carrier signal by a single-channel optical transmitter.

The pump laser source 1 generates an initial modulated optical carrier of frequency f ₀ . After the initial modulated optical carrier enters the micro-nano resonator 2, a series of modulated optical carriers of equal frequency interval f _r are generated due to stimulated Brillouin oscillation, micro-nano The resonant cavity 2 outputs the modulated optical carrier of the equal frequency interval f _r to the arrayed waveguide grating 3, and the arrayed waveguide grating 3 separates the modulated optical carriers of the equal frequency interval f _r in the frequency domain to obtain at least two modulated optical carriers, wherein The modulated optical carrier having the frequency f _n is the first modulated optical carrier, the modulated optical carrier having the frequency f _m is the second modulated optical carrier, and the frequency difference between f _m and f _n is (nm)f _r .

The baseband signal is modulated by the electro-optic modulator 110 onto the first modulated optical carrier, and the microwave signal generated by the low-band microwave source 120 is modulated by the frequency fine modulator 130 onto the second modulated optical carrier, and the microwave signal generated by the low-frequency microwave source is set. The frequency is f _k , and the frequency of the second optical signal of the frequency fine adjuster 130 is f _m -f _k and f _m +f _k through the bias of the frequency fine adjuster 130, and the first optical signal and The second optical signal is combined with the third optical signal by the optical RF transmitting module 140, and the optical RF transmitting module 140 transmits the third optical signal to the photodetector 11, and the third optical signal passes through the beat frequency of the photodetector 11. Obtaining a radio frequency carrier signal of a frequency carrier signal frequency of f _n -f _m -f _k and f _n -f _m +f _k , and the radio frequency filter 12 sets the frequency of the radio frequency carrier signal to a frequency carrier f _n -f _m -f _k The signal is filtered out, and finally the frequency of the transmitted RF carrier signal is f _n -f _m +f _k =(nm)f _r +f _k , and the filtered first RF carrier signal is amplified by the power amplifier 13 for power amplification. It is sent by the antenna.

The following describes the process of transmitting a radio frequency carrier signal by a multi-channel optical transmitter.

The pump laser source 1 generates an initial modulated optical carrier of frequency f ₀ . After the initial modulated optical carrier enters the micro-nano resonator 2, a series of modulated optical carriers of equal frequency interval f _r are generated due to stimulated Brillouin oscillation, micro-nano The resonant cavity 2 outputs the modulated optical carrier of the equal frequency interval f _r to the arrayed waveguide grating 3, and the arrayed waveguide grating 3 separates the modulated optical carriers of the equal frequency interval f _r in the frequency domain to obtain at least two modulated optical carriers, wherein 8 modulated optical carriers with frequencies f ₀ to f ₇ are respectively taken, and the 8 modulated optical carriers are paired two by two: f ₀ -f ₂ , f ₁ -f ₃ , f ₄ -f ₆ , f ₅ - f ₇ ,, the frequency difference between the paired modulated optical carriers is 2f _r .

Taking the pair of modulated optical carriers as f ₀ -f ₂ as an example, the baseband signal phase-adjusted by the analog phase shifting unit 150 is modulated by the electro-optic modulator 110 onto the first modulated optical carrier of frequency f ₀ , which is low. band microwave source generates microwave signal source 120 by the frequency fine tune 130 is modulated to a second frequency f ₂ of the modulated optical carrier, provided a microwave frequency signal source is f _3, a first frequency offset by the fine adjustment 130 The frequency of the second optical signal of the output of the frequency fine adjuster 130 is f ₂ -f ₃ and f ₂ +f ₃ , and the first optical signal and the second optical signal are synthesized by the optical radio frequency transmitting module 140. The optical signal transmitting module 140 transmits the third optical signal to the photodetector 11, and the third optical signal passes through the beat frequency of the photodetector 11, and obtains frequencies f ₀ -f ₂ -f ₃ and f The RF carrier signal of ₀ -f ₂ +f ₃ filters out the RF carrier signal with the frequency f _n -f _m -f _k through the RF filter 12, and finally obtains the frequency of the transmitted RF carrier signal as f _{0 -f 2 + f 3 = 2 *} f r + f 3, the RF carrier signal is filtered through the power amplification After 13 transmit amplified.

The transmission process of the other paired modulated optical carriers is the same as the transmission process of the pair of modulated optical carriers processed by f ₀ - f ₂ , and will not be described in detail herein.

The above description is a process of an optical transmitter. In an actual application, an existing optical receiver cannot receive a radio frequency carrier signal at an arbitrary frequency. Therefore, an embodiment of the present invention further provides an optical receiving module 20, where As shown in FIG. 2A, any one of the at least one light receiving module 20 includes:

The radio frequency receiving module 200 is configured to receive a radio frequency carrier signal.

The optical carrier generating module 210 is configured to generate a modulated optical carrier, where the modulated optical carrier comprises a first modulated optical carrier and a second modulated optical carrier;

a low-band microwave source 220 for generating a microwave signal, and the microwave signal is adjusted in units of MHz or KHz;

a frequency fine adjuster 230, configured to modulate a microwave signal onto a first modulated optical carrier to generate an optical signal;

The photodetector 240 is configured to perform a beat frequency on the optical signal and the second modulated optical carrier to generate a local oscillator signal;

The optical radio frequency receiving module 200 is further configured to perform frequency adjustment on the radio frequency carrier signal according to the local oscillator signal.

In the embodiment of the present invention, optionally, the optical carrier generation module 210 includes a pump laser source 1 for generating an initial modulated optical carrier.

In order to generate any number of equally spaced modulated optical carriers (up to hundreds of) and to improve the performance of the output modulated optical carrier, optionally, the optical carrier generating module 210 further includes a micro-nano resonator 2 and an arrayed waveguide grating. 3, as shown in Figure 2B, where:

a micro-nano resonator 2 for adjusting an initial modulated optical carrier to a modulated optical carrier of equal frequency spacing;

The arrayed waveguide grating 3 is configured to perform frequency domain separation on the equal frequency interval modulated optical carriers, and the separated modulated optical carriers include a first modulated optical carrier and a second modulated optical carrier.

Thus, by using the optical carrier generation module 210 including the pump laser source 1, the micro-nano resonator 2, and the arrayed waveguide grating 3, any number of equally spaced modulated optical carriers (up to hundreds of) can be generated and output. The modulated optical carrier has the advantages of narrow line width and low noise.

In the embodiment of the present invention, the unit adjusted by the frequency of MHz or KHz means that when the frequency is adjusted, the change of the frequency may be a change range of MHz or KHz.

Further, the pump laser source 1 and the micro-nano resonator 2 can all adopt a silicon base to reduce the cost.

Of course, other forms of optical carrier generation module 210 may also be used, which will not be described in detail herein.

In the embodiment of the present invention, optionally, when the frequency fine adjuster 230 modulates the microwave signal onto the first modulated optical carrier, optionally, the following manner may be adopted:

The frequency fine adjuster 230 uses MZM to modulate the microwave signal onto the first modulated optical carrier.

In the embodiment of the present invention, an optical receiver is further provided, including at least one light receiving module.

Further, in order to suppress the noise of the receiving link and improve the quality of the received signal, as shown in FIG. 2C, the optical receiver further includes a low noise amplifier 21 for amplifying the received RF carrier signal.

Further, to facilitate distortion-free sampling of data, as shown in FIG. 2D, the optical receiver further includes a down converter 250 for downconverting the RF carrier signal to an intermediate frequency or baseband.

It should be noted that the down conversion refers to converting the high frequency radio frequency carrier signal in the received space to the baseband, wherein the frequency of the baseband is low.

Further, in order to improve the quality of the received signal, as shown in FIG. 2E, the optical receiver further includes an intermediate frequency filter 260 for filtering out the interference signal.

The optical receiver mentioned in the embodiment of the present invention may be a single-channel optical receiver, that is, the optical receiver includes one optical receiving module, or may be a multi-channel optical receiver, that is, the optical receiver includes at least two optical receiving Module.

In the embodiment of the present invention, when the optical receiver is a multi-channel optical receiver, that is, the optical receiver includes N optical receiving modules, and N is greater than or equal to 2; at this time, further, in order to obtain multi-channel beam gain, refer to FIG. 2F. As shown, the optical receiver further includes at least two analog phase shifting units 270, and any one of the at least two analog phase shifting units 270 is coupled to any one of the N light receiving modules 20 Correspondingly, the light receiving modules 20 corresponding to any two different analog phase shifting units 270 of the at least two analog phase shifting units 270 are different, and any one of the at least two analog phase shifting units 270 is simulated. And performing phase adjustment on the local oscillation signal of the corresponding light receiving module 20, so that the signal obtained by synthesizing the RF carrier signal whose frequency is adjusted by the phase-adjusted local oscillation signal is directed to the target direction.

In the embodiment of the present invention, the analog phase shifting unit 270 specifically implements phase adjustment by delaying the baseband signal, which is a relatively mature technology, and will not be described in detail herein.

Of course, in order to obtain multi-channel beam gain, as shown in FIG. 2G, the optical receiver further includes an analog beamforming network module 22 for receiving the radio frequency carrier of at least two of the N light receiving modules 20 The phase shift is adjusted to make the phase adjusted RF carrier signal The synthesized signal points to the target direction.

The process of receiving an RF carrier signal by an optical receiver is exemplified below.

The pump laser source 1 generates an initial modulated optical carrier of frequency f ₀ . After the initial modulated optical carrier enters the micro-nano resonator 2, a series of modulated optical carriers of equal frequency interval f _r are generated due to stimulated Brillouin oscillation, micro-nano The resonant cavity 2 outputs the modulated optical carrier of the equal frequency interval f _r to the arrayed waveguide grating 3, and the arrayed waveguide grating 3 separates the modulated optical carriers of the equal frequency interval f _r in the frequency domain to obtain at least two modulated optical carriers, wherein The modulated optical carrier having the frequency f ₁ is the first modulated optical carrier, the modulated optical carrier having the frequency f ₂ is the second modulated optical carrier, and the frequency difference between f ₁ and f ₂ is (nm)f _r .

The frequency of the microwave signal generated by the low-frequency microwave source 220 is f ₃ , and the frequency of the output optical signal of the frequency fine adjuster 230 is f ₂ -f ₃ by the offset of the frequency fine adjuster 230 , and the frequency fine adjuster 230 The optical signal having the frequency f ₂ -f ₃ is transmitted to the photodetector 240, and the photodetector 240 beats the optical signal and the second modulated optical carrier, and the frequency of the local oscillator signal is f ₁ -f ₂ +f ₃ =(nm)f _r +f ₃ , the local oscillation signal of the frequency is sent to the optical radio frequency receiving module 200, and the optical radio frequency receiving module 200 can also receive the first radio frequency carrier signal, and the utilization frequency is (nm)f _r The local oscillator signal of +f ₃ processes the RF carrier signal and the RF carrier signal at the target frequency.

Referring to FIG. 3, an embodiment of the present invention provides an optical signal sending method, and the specific process of the method is as follows:

Step 300: The optical transmitting module generates a modulated optical carrier, where the modulated optical carrier includes a first modulated optical carrier and a second modulated optical carrier.

Step 310: The optical transmitting module modulates the baseband signal onto the first modulated optical carrier to generate a first optical signal.

Step 320: The light emitting module generates a microwave signal, and the microwave signal is adjusted in units of frequency of MHz or KHz;

Step 330: The optical transmitting module modulates the microwave signal onto the second modulated optical carrier to generate a second optical signal.

Step 340: The light emitting module combines the first optical signal and the second optical signal into a third optical signal, and transmits the third optical signal.

Optionally, when the optical transmitting module generates the modulated optical carrier, the following manner can be adopted:

The optical transmitting module generates an initial modulated optical carrier;

After the optical transmitting module generates the initial modulated optical carrier, before modulating the baseband signal to the first modulated optical carrier, the method further includes:

The optical transmitting module adjusts the initial modulated optical carrier to a modulated optical carrier of equal frequency interval;

The optical transmitting module performs frequency domain separation on the equal-frequency-interval modulated optical carriers, and the separated modulated optical carriers include a first modulated optical carrier and a second modulated optical carrier.

In the embodiment of the present invention, optionally, the optical transmitting module modulates the microwave signal to the second modulated optical carrier. Optionally, the method may be as follows:

The optical transmitting module uses MZM to modulate the microwave signal onto the second modulated optical carrier.

Referring to FIG. 4, the present invention further provides a method for transmitting a radio frequency carrier signal, the method being applied to an optical transmitter, the optical transmitter comprising at least one light emitting module and at least one photodetector, wherein at least one photodetector The number is the same as the number of the at least one light emitting module; each of the at least one light emitting module corresponds to one photodetector, and any two different light emitting modules of the at least one light emitting module respectively correspond to Different photodetectors;

Step 400: Any one of the at least one light emitting module adopts a transmitting optical signal as shown in FIG. 3;

Step 410: The photodetector beats the received optical signal into a radio frequency carrier signal for transmission.

In the example of the present invention, if the optical transmitter includes N optical transmitting modules, N is greater than or equal to 2; the optical transmitter further includes at least two analog phase shifting units, and any one of the at least two analog phase shifting units Corresponding to any one of the N light emitting modules, the light emitting modules corresponding to any two different analog phase shifting units of the at least two analog phase shifting units are different;

The method also includes the following operations:

Any one of the at least two analog phase shifting units performs phase adjustment on the baseband signal of the corresponding light emitting module, so that the signal obtained by synthesizing the phase-adjusted baseband signal is directed to the target direction.

Optionally, the optical transmitter includes N light emitting modules, and N is greater than or equal to 2;

The method also includes the following operations:

The analog beamforming network module included in the optical transmitter performs phase adjustment on the radio frequency carrier signal generated by at least two of the N optical transmitting modules, so that the signal obtained by synthesizing the phase-adjusted RF carrier signal is directed to the target direction.

Referring to FIG. 5, an embodiment of the present invention further provides a method for receiving a radio frequency carrier signal, and the specific process is as follows:

Step 500: The optical receiving module receives the radio frequency carrier signal.

Step 510: The optical receiving module generates a modulated optical carrier, where the modulated optical carrier includes a first modulated optical carrier and a second modulated optical carrier.

Step 520: The light receiving module generates a microwave signal, and the microwave signal is adjusted in units of MHz or KHz;

Step 530: The optical receiving module modulates the microwave signal onto the first modulated optical carrier to generate an optical signal.

Step 540: The optical receiving module performs a beat frequency on the optical signal and the second modulated optical carrier to generate a local oscillator signal.

Step 550: The optical receiving module performs frequency adjustment on the radio frequency carrier signal according to the local oscillator signal.

Optionally, when the optical receiving module generates the modulated optical carrier, specifically:

The optical receiving module generates an initial modulated optical carrier;

After the optical receiving module generates the initial modulated optical carrier, before modulating the microwave signal onto the first modulated optical carrier, the method further includes the following operations:

The optical receiving module adjusts the initial modulated optical carrier to a modulated optical carrier of equal frequency interval;

The optical receiving module performs frequency domain separation on the equal-frequency-interval modulated optical carriers, and the separated modulated optical carriers include a first modulated optical carrier and a second modulated optical carrier.

In the embodiment of the present invention, when the optical receiving module modulates the microwave signal to the first modulated optical carrier, the method may be as follows:

The optical receiving module uses MZM to modulate the microwave signal onto the first modulated optical carrier.

The embodiment of the invention further provides a radio frequency carrier signal receiving method, which is applied to light receiving The optical receiver adopts the method shown in FIG.

Optionally, the optical receiver includes N optical receiving modules, where N is greater than or equal to 2; the optical receiver further includes at least two analog phase shifting units, and any one of the at least two analog phase shifting units and the N Corresponding to any one of the light receiving modules, the light receiving modules corresponding to any two different analog phase shifting units of the at least two analog phase shifting units are different;

The method also includes the following operations:

Performing phase adjustment on the local oscillator signal of the corresponding light receiving module by using any one of the at least two analog phase shifting units, so that the frequency modulated RF signal is synthesized by using the phase adjusted local oscillator signal The signal points to the target direction.

In the embodiment of the present invention, further, the method further includes the following operations:

The optical beam receiver includes an analog beamforming network module, and performs phase shift adjustment on the radio frequency carrier signal received by at least two of the N optical receiving modules, so that the signal obtained by synthesizing the phase adjusted RF carrier signal is directed to the target. direction.

Referring to FIG. 6 , based on the similar structure of FIG. 1C , an embodiment of the present invention further provides a millimeter wave local oscillator source, and the millimeter wave local oscillator source specifically includes a pump laser source 601 , an optical micro resonant cavity 602 , and an optical filter. 603 and photodetector 604:

a pump laser source 601 for generating a first optical carrier;

In order to prevent the optical carrier reflected by the optical micro-resonator 602 from interfering with the pump laser source 601, an optical circulator may be connected between the pump laser source 601 and the optical micro-resonator 602 in this embodiment, the optical ring The first optical carrier output from the pump laser source 601 is input to the optical micro-resonator 602, and the optical carrier reflected back from the optical micro-resonator 602 is output from a set port.

An optical micro-resonator 602, configured to adjust the first optical carrier to an optical carrier of equal frequency spacing;

The optical micro-resonator 602 may be a micro-ring resonator, a micro-disk resonator or a microsphere resonator, or an optical micro-resonator of other structures capable of generating an optical frequency comb.

The optical filter 603 is configured to perform frequency domain separation on the optical carriers of the equal frequency intervals, separate a set number of second optical carriers, and combine the second optical carriers to form a second carrier. Wave pair

Optionally, the optical filter 603 may be an Array Waveguide Gratings (AWG), a Bragg Grating Filter (FBG), or an optical thin film filter.

a photodetector 604, configured to perform a beat frequency on two second optical carriers in each of the second carrier pairs, and form a millimeter wave corresponding to each of the second carrier pairs after the beat frequency; The frequency of each millimeter wave is the difference between the frequencies of the two second optical carriers in the corresponding second carrier pair.

In this embodiment, the photodetector 604 can include a plurality.

Optionally, in order to increase the output power of the millimeter wave local oscillator by the photodetector 604, the embodiment may further connect an optical amplifier between the optical filter 603 and the photodetector 604 for amplifying the second optical carrier. Optical power.

In the embodiment of the present invention, in order to perform frequency domain separation on the optical carriers of the equal frequency intervals, a set number of second optical carriers are separated, and the second optical carriers are combined to form a second The two carrier pairs, the optical filter 603 can be implemented in a variety of ways, and the following two optimization methods are provided:

The optical filter 603 is formed by an array of Array Waveguide Gratings (AWG) 701 and a 2x1 arrayed waveguide grating 702 (as shown in FIG. 7). Specifically, the optical filter 603 may be:

An arrayed waveguide grating 701, configured to separate a second optical carrier of each of the optical carriers of the equal frequency intervals;

A 2x1 arrayed waveguide grating (AWG) 702 is configured to combine the second optical carriers in pairs according to the frequency of the millimeter wave to form the second carrier pair.

The principle of generating millimeter waves by this method is:

After the second optical carrier passes through the AWG, the optical carriers of each frequency of the second optical carrier are separately extracted, and then the proposed optical carriers are combined by the 2x1 AWG, and each optical carrier is combined and input to the photodetector; The photodetector performs a beat frequency for two optical carriers in each optical carrier combination, and the frequency of the millimeter wave generated after the beat frequency is the difference between the frequencies of the two optical carriers in the optical carrier combination.

For example, the frequency interval between two adjacent second optical carriers is Δf. If the 2x1AWG selects the first second optical carrier and the k second optical carriers are combined to form an optical carrier combination, the millimeter wave generated by the beat frequency The frequency is fmm, 1 = f1 - fk = (k - 1) Δf. Since the optical microcavity can generate hundreds of optical carriers, the 2x1 AWG can simultaneously select two second optical carriers with a frequency interval of (k-1) Δf to form an optical carrier combination, and respectively respectively The carrier combination is input to different photodetectors for beat frequency, so that a multi-output millimeter-wave local oscillator source can be realized. In addition, the 2x1AWG can also select the second optical carrier with other frequency intervals to combine and input the photodetector to perform the beat frequency. For example, two second optical carriers with the frequency fj and fj+m are selected, and the frequency can be generated after the beat frequency. It is a millimeter wave of fmm, 2 = fj - fj + m = m Δf. Therefore, the local oscillator source based on the scheme can simultaneously generate millimeter-wave local oscillator signals of different frequencies and multiple outputs.

Second, the optical filter 603 is composed of an optical filter array.

As shown in FIG. 8, when the optical filter 603 is composed of the optical filter array 801, the specific structure of the millimeter wave local oscillator source provided by the embodiment of the present invention may be:

The pump laser source outputs a single frequency optical carrier input through the first port of the circulator 802, and is input to the optical micro-resonator through the second port, and part of the light is reflected back and reflected when the optical carrier is input to the optical micro-resonator. The returned optical carrier is output through the other ports of the circulator 802 except the first port, so that the reflected optical carrier is not directly input to the pump laser source, thereby preventing the reflected optical carrier from interfering or damaging the pump laser source;

The optical carrier output from the optical microcavity is input to an optical filter array (which may be a Bragg grating filter, an optical thin film filter or other optical filter), and the optical filter array combines the optical carriers in two ;

The optical carrier output from the optical filter array is input to an optical amplifier array 803, which amplifies the optical power of the optical carrier, thereby increasing the power of the output millimeter wave local oscillator.

The optical carrier output from the optical filter array is input to the photodetector array for beat frequency to obtain a corresponding millimeter wave.

The millimeter-wave local oscillator source provided by the embodiment of the invention is based on the millimeter-wave local oscillator source of the optical micro-resonator, and can realize multi-band and multi-channel millimeter-wave local oscillator source output;

And since the optical carriers output by the optical microcavity are correlated, the millimeter wave phase noise generated by the difference frequency between the optical carriers is low;

In addition, in the embodiment of the present invention, by integrating the pump laser source, the optical micro-resonator, the AWG and the photodetector array, the size and cost of the local oscillator source can be effectively reduced; the scheme does not require a modulator, and only one laser is needed. Therefore, the cost is reduced when multiple outputs are implemented. The optical frequency combs formed by the optical microcavity are very stable, and can output millimeter waves with high frequency stability.

As shown in FIG. 9, the embodiment of the present invention further provides a method for generating a millimeter wave, and the method specifically includes the following implementation steps:

Step 901, generating a first optical carrier of a single frequency;

Step 902, adjusting the first optical carrier to an optical carrier of equal frequency interval;

Step 903: Perform frequency domain separation on the optical carriers of the equal frequency interval, separate a set number of second optical carriers, and combine the second optical carriers to form a second carrier pair.

Wherein, the frequency of the millimeter wave formed by the two second optical carriers after the beat frequency is combined with the two second optical carriers performing the beat frequency to form the second carrier pair includes:

And combining the second optical carriers to form a second carrier pair according to the frequency of the millimeter wave.

Step 904, performing beat frequency on two second optical carriers in each of the second carrier pairs, and forming a millimeter wave corresponding to each of the second carrier pairs after the beat frequency; wherein each millimeter wave The frequency is the difference between the frequencies of the two second optical carriers in the corresponding second carrier pair.

In order to increase the optical power of the generated millimeter wave, before performing the frequency scrambling on the two second optical carriers in each of the second carrier pairs, the optical power of the second optical carrier is further amplified.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. For the implementation of a function in a flow or a flow chart and/or a block diagram of a block or blocks Set.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus functions in one or more blocks of a flow or a flow diagram and/or block diagram of a flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions in one or more blocks of the flowchart or in a flow or block of the flowchart.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the invention without departing from the spirit and scope of the embodiments of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the embodiments of the invention.

Claims (33)

1. A light emitting module, comprising:

   An optical carrier generating module, configured to generate a modulated optical carrier, where the modulated optical carrier includes a first modulated optical carrier and a second modulated optical carrier;

   An electro-optic modulator for modulating a baseband signal onto the first modulated optical carrier to generate a first optical signal;

   a low-band microwave source for generating a microwave signal, the microwave signal being adjusted in units of frequency of MHz or KHz;

   a frequency fine adjuster for modulating the microwave signal onto the second modulated optical carrier to generate a second optical signal;

   The optical RF transmitting module is configured to combine the first optical signal and the second optical signal into a third optical signal, and transmit the third optical signal.
2. The light emitting module of claim 1 wherein said optical carrier generation module comprises a pump laser source for generating an initial modulated optical carrier;

   The optical carrier generation module further includes a micro-nano resonator and an arrayed waveguide grating, wherein:

   The micro-nano resonator is configured to adjust the initial modulated optical carrier to a modulated optical carrier of equal frequency spacing;

   The arrayed waveguide grating is configured to perform frequency domain separation on the equal frequency interval modulated optical carriers, where the separated modulated optical carriers comprise the first modulated optical carrier and the second modulated optical carrier.
3. The light emitting module according to claim 1 or 2, wherein when the frequency fine modulator modulates the microwave signal onto the second modulated optical carrier, specifically:

   The frequency fine adjuster uses a Mach-Zehnder modulator MZM to modulate the microwave signal onto the second modulated optical carrier.
4. An optical transmitter, comprising at least one light emitting module and at least one photodetector according to any one of claims 1-3, said at least one photodetector The number of the at least one light emitting module is the same; each of the at least one light emitting module corresponds to one photodetector, and any two of the at least one light emitting module are different The light emitting modules respectively have different photodetectors;

   The photodetector is configured to beat the optical signal emitted by the corresponding optical transmitting module into a radio frequency carrier signal for transmission.
5. The optical transmitter according to claim 4, wherein said optical transmitter comprises N light emitting modules, said N being greater than or equal to 2;

   The optical transmitter further includes at least two analog phase shifting units, and any one of the at least two analog phase shifting units corresponds to any one of the N light emitting modules, The light emitting modules corresponding to any two different analog phase shifting units of the at least two analog phase shifting units are different, and any one of the at least two analog phase shifting units is used for The baseband signal of the corresponding light emitting module is phase-adjusted so that the signal obtained by synthesizing the phase-adjusted baseband signal is directed to the target direction.
6. The optical transmitter according to claim 4 or 5, wherein the optical transmitter comprises N light emitting modules, and the N is greater than or equal to 2;

   The optical transmitter further includes an analog beamforming network module, configured to phase adjust a radio frequency carrier signal generated by at least two of the N optical transmitting modules, so that the phase adjusted RF carrier signal is synthesized. The signal points to the target direction.
7. A light receiving module, comprising:

   An optical radio frequency receiving module, configured to receive a radio frequency carrier signal;

   An optical carrier generating module, configured to generate a modulated optical carrier, where the modulated optical carrier includes a first modulated optical carrier and a second modulated optical carrier;

   a low-band microwave source for generating a microwave signal, the microwave signal being adjusted in units of MHz or KHz;

   a frequency fine adjuster for modulating the microwave signal onto the first modulated optical carrier to generate an optical signal;

   a photodetector for scoring the optical signal and the second modulated optical carrier to generate Local oscillator signal

   The optical radio frequency receiving module is further configured to perform frequency adjustment on the radio frequency carrier signal according to the local oscillator signal.
8. The optical receiving module according to claim 7, wherein said optical carrier generating module comprises a pumping laser source for generating an initial modulated optical carrier;

   The optical carrier generation module further includes a micro-nano resonator and an arrayed waveguide grating, wherein:

   The micro-nano resonator is configured to adjust the initial modulated optical carrier to a modulated optical carrier of equal frequency spacing;

   The arrayed waveguide grating is configured to perform frequency domain separation on the equal frequency interval modulated optical carriers, where the separated modulated optical carriers comprise the first modulated optical carrier and the second modulated optical carrier.
9. The optical receiving module according to claim 7 or 8, wherein the frequency fine adjuster modulates the microwave signal onto the first modulated optical carrier, specifically:

   The frequency fine adjuster uses a Mach-Zehnder modulator MZM to modulate the microwave signal onto the first modulated optical carrier.
10. An optical receiver, comprising at least one light receiving module according to any of claims 7-9.
11. The optical receiver according to claim 10, wherein said optical receiver comprises N light receiving modules, said N being greater than or equal to 2;

    The optical receiver further includes at least two analog phase shifting units, and any one of the at least two analog phase shifting units corresponds to any one of the N light receiving modules, The light receiving modules corresponding to any two different analog phase shifting units of the at least two analog phase shifting units are different, and any one of the at least two analog phase shifting units is used for The phase adjustment of the local oscillator signal of the corresponding light receiving module is performed such that the signal obtained by synthesizing the RF carrier signal whose frequency is adjusted by the phase adjusted local oscillator signal is directed to the target direction.
12. An optical receiver according to claim 10 or 11, wherein said optical receiver The method further includes an analog beamforming network module, configured to perform phase shift adjustment on a radio frequency carrier signal received by at least two of the N optical receiving modules, so that a signal obtained by synthesizing the phase adjusted RF carrier signal is directed Target direction.
13. An optical signal transmitting method, comprising:

    The optical transmitting module generates a modulated optical carrier, where the modulated optical carrier includes a first modulated optical carrier and a second modulated optical carrier;

    The light emitting module modulates a baseband signal onto the first modulated optical carrier to generate a first optical signal;

    The light emitting module generates a microwave signal, and the microwave signal is adjusted in units of frequency of MHz or KHz;

    The light emitting module modulates the microwave signal onto the second modulated optical carrier to generate a second optical signal;

    The light emitting module combines the first road light signal and the second road light signal into a third road light signal, and transmits the third road light signal.
14. The method of claim 13, wherein the optical transmitting module generates a modulated optical carrier, comprising:

    The light emitting module generates an initial modulated optical carrier;

    After the optical transmitting module generates the initial modulated optical carrier, and before modulating the baseband signal to the first modulated optical carrier, the method further includes:

    The optical transmitting module adjusts the initial modulated optical carrier to a modulated optical carrier of equal frequency interval;

    The optical transmitting module performs frequency domain separation on the modulated optical carriers of the equal frequency interval, and the separated modulated optical carriers include the first modulated optical carrier and the second modulated optical carrier.
15. The method according to claim 13 or 14, wherein the optical transmitting module modulates the microwave signal onto the second modulated optical carrier, comprising:

    The light emitting module employs a Mach-Zehnder modulator MZM to modulate the microwave signal onto the second modulated optical carrier.
16. A method for transmitting a radio frequency carrier signal, characterized in that it is applied to an optical transmitter, the optical transmitter comprising at least one light emitting module and at least one photodetector, wherein the number of the at least one photodetector is The number of the at least one light emitting module is the same; each of the at least one light emitting module corresponds to one photodetector, and any two different light emitting modules of the at least one light emitting module respectively Corresponding photodetectors are different;

    Any one of the at least one light emitting module adopting a transmitting optical signal according to the method of any one of claims 13-15;

    The photodetector beats the received optical signal into a radio frequency carrier signal for transmission.
17. The method of claim 16 wherein said optical transmitter comprises N light emitting modules, said N being greater than or equal to 2; said optical transmitter further comprising at least two analog phase shifting units, said Any one of the at least two analog phase shifting units corresponding to any one of the N light emitting modules, any two different analogs of the at least two analog phase shifting units The light emitting modules corresponding to the phase shifting units are different;

    The method further includes:

    The analog phase shifting unit of the at least two analog phase shifting units performs phase adjustment on the baseband signal of the corresponding light emitting module, so that the signal obtained by combining the phase adjusted baseband signals is directed to the target direction.
18. The method according to claim 16 or 17, wherein the optical transmitter comprises N light emitting modules, and the N is greater than or equal to 2;

    The method further includes:

    The optical beam transmitter includes: an analog beamforming network module that performs phase adjustment on a radio frequency carrier signal generated by at least two of the N optical transmitting modules, so that a signal obtained by synthesizing the phase adjusted RF carrier signal is directed Target direction.
19. A radio frequency carrier signal receiving method, comprising:

    The light receiving module receives a radio frequency carrier signal;

    The optical receiving module generates a modulated optical carrier, where the modulated optical carrier includes a first modulated optical carrier And a second modulated optical carrier;

    The light receiving module generates a microwave signal, and the microwave signal is adjusted in units of MHz or KHz;

    The light receiving module modulates the microwave signal onto the first modulated optical carrier to generate an optical signal;

    The light receiving module beats the optical signal and the second modulated optical carrier to generate a local oscillator signal;

    The light receiving module performs frequency adjustment on the radio frequency carrier signal according to the local oscillation signal.
20. The method of claim 19, wherein the optical receiving module generates a modulated optical carrier, comprising:

    The light receiving module generates an initial modulated optical carrier;

    After the optical receiving module generates the initial modulated optical carrier, and before modulating the microwave signal to the first modulated optical carrier, the method further includes:

    The light receiving module adjusts the initial modulated optical carrier to a modulated optical carrier of equal frequency interval;

    The optical receiving module performs frequency domain separation on the modulated optical carriers of the equal frequency interval, and the separated modulated optical carriers include the first modulated optical carrier and the second modulated optical carrier.
21. The method according to claim 19 or 20, wherein the optical receiving module modulates the microwave signal onto the first modulated optical carrier, comprising:

    The light receiving module uses a Mach-Zehnder modulator MZM to modulate the microwave signal onto the first modulated optical carrier.
22. A radio frequency carrier signal receiving method, characterized by being applied to an optical receiver, the optical receiver employing the method according to any one of claims 19-21.
23. The method according to claim 22, wherein said optical receiver comprises N light receiving modules, said N being greater than or equal to 2; said optical receiver further comprising at least two analog phase shifting units, said Any one of the at least two analog phase shifting units corresponding to any one of the N light receiving modules, any of the at least two analog phase shifting units The light receiving modules corresponding to the two different analog phase shifting units are different;

    The method further includes:

    Any one of the at least two analog phase shifting units performs phase adjustment on the local oscillator signal of the corresponding light receiving module, so that the frequency carrier signal synthesis using the phase adjusted local oscillator signal is performed The resulting signal points to the target direction.
24. The method of claim 22 or 23, wherein the method further comprises:

    The optical beam receiver includes an analog beamforming network module, and performs phase shift adjustment on a radio frequency carrier signal received by at least two of the N optical receiving modules, so that the phase adjusted RF carrier signal is synthesized. The signal points to the target direction.
25. A millimeter wave local oscillator source, characterized in that it comprises:

    a pumping laser source for generating a first optical carrier;

    An optical microcavity for adjusting the first optical carrier to an optical carrier of equal frequency spacing;

    An optical filter, configured to perform frequency domain separation on the optical carriers of the equal frequency intervals, separate a set number of second optical carriers, and combine the second optical carriers to form a second carrier pair ;

    a photodetector for scrambling two second optical carriers in each of the second carrier pairs, and forming a millimeter wave corresponding to each of the second carrier pairs after the beat frequency; wherein each of the The frequency of the millimeter wave is the difference between the frequencies of the two second optical carriers in the corresponding second carrier pair.
26. A millimeter wave local oscillator source according to claim 25, wherein said optical microresonator comprises a microring resonator, a microdisk resonator or a microsphere resonator.
27. The millimeter-wave local oscillator source according to claim 25 or 26, wherein the optical filter comprises an arrayed waveguide grating AWG, a Bragg grating filter or an optical thin film filter.
28. The millimeter-wave local oscillator source according to claim 25 or 26, wherein the optical filter specifically comprises:

    An arrayed waveguide grating AWG, configured to separate a second optical carrier of each of the equal frequency spaced optical carriers;

    a 2x1 AWG for combining the second optical carriers according to the frequency of the millimeter wave Into the second carrier pair.
29. The millimeter wave local oscillator source according to any one of claims 25 to 28, wherein the millimeter wave local oscillator source further comprises:

    An optical amplifier disposed between the optical filter and the photodetector for amplifying optical power of the second optical carrier.
30. The millimeter wave local oscillator source according to any one of claims 25 to 29, wherein the millimeter wave local oscillator source further comprises:

    An optical circulator disposed between the pump laser source and the optical micro-resonator for inputting a first optical carrier output by the pump laser source to the optical micro-resonator The optical carrier reflected back from the optical microcavity is output from the set port.
31. A method for generating millimeter waves, comprising:

    Generating a first optical carrier of a single frequency;

    Adjusting the first optical carrier to an optical carrier of equal frequency spacing;

    Performing frequency domain separation on the optical carriers of the equal frequency intervals, separating the obtained set number of second optical carriers, and combining the second optical carriers to form a second carrier pair;

    Performing beat frequency on two second optical carriers in each of the second carrier pairs, and forming a millimeter wave corresponding to each of the second carrier pairs after the beat frequency; wherein the frequency of each millimeter wave is The difference between the frequencies of the two second optical carriers in the corresponding second carrier pair.
32. The method according to claim 31, wherein said combining said second optical carriers in pairs to form a second carrier pair comprises:

    And combining the second optical carriers to form a second carrier pair according to the frequency of the millimeter wave.
33. The method according to claim 31 or 32, further comprising: amplifying the optical power of the second optical carrier before performing frequency scrambling on the two second optical carriers in each of the second carrier pairs.

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