CN111416667A - Broadband channelized receiver - Google Patents
Broadband channelized receiver Download PDFInfo
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- CN111416667A CN111416667A CN202010151512.3A CN202010151512A CN111416667A CN 111416667 A CN111416667 A CN 111416667A CN 202010151512 A CN202010151512 A CN 202010151512A CN 111416667 A CN111416667 A CN 111416667A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/615—Arrangements affecting the optical part of the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The embodiment of the invention provides a broadband channelized receiver, which comprises an optical phase-locked frequency stabilization module, an optical comb generation module, a linear modulation and demultiplexing module and an orthogonal frequency mixing and demodulation module, wherein the optical comb generation module, the linear modulation and demultiplexing module and the orthogonal frequency mixing and demodulation module are sequentially connected; the optical comb generating module is used for respectively generating a signal optical comb and a local oscillator optical comb based on laser emitted by two optical fiber lasers with different wavelengths, and the optical phase-locking and frequency-stabilizing module is used for keeping the frequency alignment of a first signal comb tooth of the signal optical comb and a first local oscillator comb tooth of the local oscillator optical comb. The broadband channelized receiver provided by the embodiment of the invention improves the comb tooth power of a single optical comb, further improves the signal-to-noise ratio of a channelized signal, simultaneously improves the frequency spectrum utilization rate of the comb teeth of the optical comb, reduces the quantity requirement of the comb teeth of the optical comb, and avoids the problems of wider filtering bandwidth and center wavelength drift generated in the periodic filtering process.
Description
Technical Field
The invention relates to the field of optical communication, in particular to a broadband channelized receiver.
Background
With the development of communication technology, no matter the communication navigation identification technology commonly used in life or the radar reconnaissance technology in modern electronic wars, the bandwidth of signals to be processed is continuously increased, and the frequency of carrier waves is also continuously improved. Therefore, it is necessary to channelize and receive a high-frequency broadband radio frequency signal (several tens of gigahertz) to convert it into an intermediate frequency signal having a lower frequency. The traditional electronic technology channelized receiver utilizes an analog electronic device to carry out down-conversion, and the method has the problems of large device size, limited bandwidth range, high loss, incapability of coping with strong-interference electromagnetic environment and the like, and is difficult to meet the requirements of increasingly developed radio frequency systems. With the continuous development of photon technology, microwave photonics has become a hot point of research. By utilizing the advantages of low loss, small size, broadband, interference resistance and the like of the photon technology, the microwave photonics breaks through the technical bottleneck encountered in the microwave engineering of the traditional electronic technology.
Currently, many microwave optical sub-channelization methods are used for down-conversion reception of radio frequency signals, wherein a channelization scheme based on optical frequency combs is widely studied. In the existing optical frequency comb-based channelized measurement system, due to the difference of free spectral ranges of a signal optical frequency comb and a local oscillator optical frequency comb, radio frequency signals at different frequency points are divided into different channels, and the frequency spectrum utilization rate of optical comb teeth is not high. The other radio frequency channelization method utilizes a periodic filtering device to reduce the comb tooth interval of the local oscillator optical comb, but the conventional periodic filtering device has the problems of wider filtering bandwidth, center wavelength drift and the like.
Disclosure of Invention
The embodiment of the invention provides a broadband channelized receiver, which is used for solving the problems that the frequency utilization rate of an optical comb tooth is not high in the existing channelized scheme based on an optical frequency comb, and the filtering bandwidth is wide and the central wavelength is shifted due to the utilization of a periodic filtering device.
The embodiment of the invention provides a broadband channelized receiver, which comprises an optical phase-locked frequency stabilization module, an optical comb generation module, a linear modulation and demultiplexing module and an orthogonal frequency mixing and demodulation module, wherein the optical comb generation module, the linear modulation and demultiplexing module and the orthogonal frequency mixing and demodulation module are sequentially connected;
the optical comb generating module is used for respectively generating a signal optical comb and a local oscillator optical comb based on laser emitted by two optical fiber lasers with different wavelengths, and the optical phase-locking and frequency-stabilizing module is used for keeping the frequency alignment of a first signal comb tooth of the signal optical comb and a first local oscillator comb tooth of the local oscillator optical comb.
Furthermore, the optical phase-locking frequency stabilizing module is connected with the linear modulation and demultiplexing module;
and the linear modulation and demultiplexing module inputs partial signal power of the first signal comb teeth of the signal optical comb and partial local oscillator power of the first local oscillator comb teeth of the local oscillator optical comb to the optical phase-locked frequency stabilization module so that the optical phase-locked frequency stabilization module can keep the frequencies of the first signal comb teeth of the signal optical comb and the first local oscillator comb teeth of the local oscillator optical comb aligned based on the partial signal power and the partial local oscillator power.
Further, the optical phase-locked frequency stabilization module is respectively connected with a local oscillator output port of the optical comb generation module and a demultiplexing input port of the linear modulation and demultiplexing module;
and the local oscillator optical comb output by the local oscillator output port is input to the demultiplexing input port after the phase of the local oscillator optical comb is adjusted by the optical phase-locking and frequency-stabilizing module.
Further, the optical phase-locking frequency stabilization module is connected with a local oscillator fiber laser of the optical comb generation module;
and the optical phase-locking frequency stabilization module is used for adjusting the output frequency of the local oscillator fiber laser.
Further, the orthogonal frequency mixing and demodulating module performs orthogonal frequency mixing and demodulation on each signal comb tooth of the signal optical comb and each local oscillator comb tooth of the local oscillator optical comb to obtain a channel receiving signal of each channel;
the bandwidth of any channel is the difference between the frequency interval of the local oscillation comb teeth of the local oscillation optical comb and the frequency interval of the signal comb teeth of the signal optical comb;
the frequency range of the signal received in any channel is determined based on the frequency difference between the local oscillator comb teeth corresponding to any channel and the signal comb teeth and the bandwidth of any channel.
Further, the frequency range f of the signal received in any channelbandAs shown in the following formula:
in the formula (f)ΔAnd k is a fixed frequency difference between the first signal comb teeth and the first local oscillator comb teeth, k is a serial number of any one channel, and β is a bandwidth.
Further, the optical comb generating module comprises a signal optical comb generating submodule and a local oscillator optical comb generating submodule;
the signal optical comb generation submodule is used for generating the signal optical comb based on laser emitted by a signal optical fiber laser, and the local oscillator optical comb generation submodule is used for generating the local oscillator optical comb based on laser emitted by a local oscillator optical fiber laser.
Further, the linear modulation and demultiplexing module comprises a linear modulation submodule and a demultiplexing submodule;
the linear modulation submodule is used for linearly modulating a received broadband radio frequency signal to the signal optical comb, and the demultiplexing submodule is used for demultiplexing the local oscillator optical comb and the linearly modulated signal optical comb.
According to the broadband channelized receiver provided by the embodiment of the invention, the two optical fiber lasers with different wavelengths are respectively used for correspondingly generating the signal optical comb and the local oscillator optical comb, so that the comb tooth power of a single optical comb is improved, and the signal-to-noise ratio of a channelized signal is further improved. Meanwhile, the frequency of the first signal comb teeth of the signal optical comb and the frequency of the first local oscillator comb teeth of the local oscillator optical comb are kept to be aligned by the optical phase lock frequency stabilization module, so that the frequency comb teeth on the left side and the right side of the central frequency of the signal optical comb and the local oscillator optical comb can be fully utilized, the frequency spectrum utilization rate of the comb teeth of the optical comb is improved, and the requirement on the number of the comb teeth of the optical comb is lowered. In addition, the broadband channelized receiver provided by the embodiment of the invention does not use a periodic filtering device, so that the problems of wider filtering bandwidth and center wavelength drift generated in the periodic filtering process are avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a wideband channelized receiver provided in an embodiment of the present invention;
fig. 2 is a schematic frequency spectrum diagram of a signal optical comb and a local oscillator optical comb according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a wideband channelized receiver according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a wideband channelized receiver according to an embodiment of the present invention, and as shown in fig. 1, the wideband channelized receiver includes an optical phase-locked frequency stabilization module 140, and an optical comb generation module 110, a linear modulation and demultiplexing module 120, and a quadrature frequency mixing and demodulation module 130, which are connected in sequence; the optical comb generating module 110 is configured to generate a signal optical comb and a local oscillator optical comb respectively based on laser beams emitted by two fiber lasers with different wavelengths, and the optical phase-locked frequency stabilizing module 140 is configured to keep frequencies of a first signal comb tooth of the signal optical comb and a first local oscillator comb tooth of the local oscillator optical comb aligned.
Specifically, the operating principle of the wideband channelized receiver is as follows: the broadband channelized receiver generates two groups of coherent optical frequency combs, and after broadband radio-frequency signals are obtained, one group of optical frequency combs are used as carriers for modulating the broadband radio-frequency signals; and taking the other group of optical frequency combs as an optical local oscillator. The broadband radio-frequency signals modulated by each local oscillator comb tooth and the corresponding carrier comb tooth are subjected to digital coherent demodulation, different frequency sections of one broadband radio-frequency signal are disassembled in a multi-channel mode, and down-conversion is carried out on the radio-frequency signals within the range of each channel, so that channelized reception of the broadband radio-frequency signals is realized.
In the embodiment of the invention, two optical fiber lasers with different wavelengths emit two lasers with different wavelengths to an optical comb generation module, and the two lasers are respectively used for generating a signal optical comb and a local oscillator optical comb, wherein the signal optical comb is used as a carrier and is used for modulating a broadband radio frequency signal. Because the wavelengths of the two optical fiber lasers are different, the center frequencies of the generated signal optical comb and the generated local oscillator optical comb are different. The optical phase-locking and frequency-stabilizing module keeps the first signal comb teeth of the signal optical comb and the first local oscillator comb teeth of the local oscillator optical comb in frequency alignment by adopting an optical phase-locking technology.
Fig. 2 is a schematic frequency spectrum diagram of a signal optical comb and a local oscillator optical comb provided in an embodiment of the present invention, and as shown in fig. 2, it is assumed that a center frequency of the signal optical comb is fsigWith a frequency interval of comb teeth ofsigThe frequency of the kth signal comb of the signal optical comb
The center frequency of the local oscillator optical comb is floWith a frequency interval of comb teeth ofloThen the frequency of the n-th local oscillator comb of the local oscillator optical comb is
The optical phase-locking and frequency-stabilizing module makes the first signal comb tooth of the signal optical comb and the first local oscillator comb tooth of the local oscillator optical comb have a stable frequency difference by using the optical phase-locking technology
The frequency difference f is generated between the kth signal comb tooth of the signal optical comb and the kth local oscillator comb tooth of the local oscillator optical combΔ+(k-1)(lo-sig) The frequency difference corresponds to the channel RkThe center frequency of (c). After passing through the optical phase-locking frequency stabilization module, the frequency comb teeth on the left and right sides of the central frequency of the signal optical comb and the local oscillator optical comb can be used for channel division.
According to the broadband channelized receiver provided by the embodiment of the invention, the two optical fiber lasers with different wavelengths are respectively used for correspondingly generating the signal optical comb and the local oscillator optical comb, so that the comb tooth power of a single optical comb is improved, and the signal-to-noise ratio of the channelized signal is further improved. Meanwhile, the frequency of the first signal comb teeth of the signal optical comb and the frequency of the first local oscillator comb teeth of the local oscillator optical comb are kept to be aligned by the optical phase lock frequency stabilization module, so that the frequency comb teeth on the left side and the right side of the central frequency of the signal optical comb and the local oscillator optical comb can be fully utilized, the frequency spectrum utilization rate of the comb teeth of the optical comb is improved, and the requirement on the number of the comb teeth of the optical comb is lowered. In addition, the broadband channelized receiver provided by the embodiment of the invention does not use a periodic filtering device, so that the problems of wider filtering bandwidth and center wavelength drift generated in the periodic filtering process are avoided.
Based on the above embodiment, in the broadband channelized receiver, the optical phase-locked frequency stabilization module is connected with the linear modulation and demultiplexing module; the linear modulation and demultiplexing module inputs partial signal power of first signal comb teeth of the signal optical comb and partial local oscillator power of first local oscillator comb teeth of the local oscillator optical comb to the optical phase-locked frequency stabilization module, so that the optical phase-locked frequency stabilization module keeps frequency alignment of the first signal comb teeth of the signal optical comb and the first local oscillator comb teeth of the local oscillator optical comb based on the partial signal power and the partial local oscillator power.
Specifically, after the signal optical comb and the local oscillator optical comb pass through the linear modulation and demultiplexing module, a part of signal power of a first signal comb tooth of the signal optical comb and a part of local oscillator power of a first local oscillator comb tooth of the local oscillator optical comb are input into the optical phase-locked frequency stabilization module, for example, 10% of signal power of the first signal comb tooth of the signal optical comb and 10% of local oscillator power of the first local oscillator comb tooth of the local oscillator optical comb are input into the optical phase-locked frequency stabilization module, the optical phase-locked frequency stabilization module refers to a phase difference between the part of signal power and the part of local oscillator power, and an optical phase-locked technology is adopted to enable the first signal comb tooth of the signal optical comb and the first comb tooth of the local oscillator optical comb to be frequency.
According to the broadband channelized receiver provided by the embodiment of the invention, part of the signal power of the first signal comb teeth of the signal optical comb and part of the local oscillator power of the first local oscillator comb teeth of the local oscillator optical comb are input into the optical phase-locked frequency stabilizing module, and the first signal comb teeth of the signal optical comb and the first local oscillator comb teeth of the local oscillator optical comb are kept to be aligned in frequency by the optical phase-locked frequency stabilizing module, so that the frequency comb teeth on the left side and the right side of the central frequency of the signal optical comb and the local oscillator optical comb can be fully utilized, the frequency spectrum utilization rate of the comb teeth of the optical comb is improved, and the requirement on the number of the comb teeth.
Based on any of the above embodiments, in the broadband channelized receiver, the optical phase-locked frequency stabilization module is respectively connected to the local oscillator output port of the optical comb generation module and the demultiplexing input port of the linear modulation and demultiplexing module; the local oscillator optical comb output by the local oscillator output port is input to the demultiplexing input port after the phase of the local oscillator optical comb is adjusted by the optical phase-locking and frequency-stabilizing module.
Specifically, the optical phase-locked frequency stabilization module can track the phase jitter of the local oscillator optical comb to realize the frequency alignment of the first signal comb teeth of the signal optical comb and the first local oscillator comb teeth of the local oscillator optical comb. Further, the optical phase-locked frequency stabilization module adjusts the phase of the local oscillator optical comb output by the local oscillator output port by taking the partial signal power of the first signal comb teeth and the partial local oscillator power of the first local oscillator comb teeth output by the linear modulation and demultiplexing module as references.
In the embodiment of the invention, the optical phase locking technology adopted by the optical phase locking and frequency stabilizing module realizes phase locking by adjusting the phase of an optical comb, namely a 'fast loop'. The optical phase-locked frequency stabilization module continuously adjusts the phase of the first local oscillator comb tooth of the local oscillator optical comb by tracking the phase difference between the first signal comb tooth of the signal optical comb and the first local oscillator comb tooth of the local oscillator optical comb until the phase of the first signal comb tooth of the signal optical comb is synchronous with the phase of the first local oscillator comb tooth of the local oscillator optical comb, namely, the first signal comb tooth is aligned with the first local oscillator optical comb frequency.
According to the broadband channelized receiver provided by the embodiment of the invention, the phase of the local oscillator optical comb is adjusted through the optical phase-locked frequency stabilization module, so that the frequency alignment of the first signal comb tooth of the signal optical comb and the first local oscillator comb tooth of the local oscillator optical comb is kept, the frequency comb teeth on the left side and the right side of the central frequency of the signal optical comb and the local oscillator optical comb can be fully utilized, the frequency spectrum utilization rate of the comb teeth of the optical comb is improved, and the requirement on the number of the comb teeth of the optical comb is reduced.
Based on any embodiment, in the broadband channelized receiver, an optical phase-locked frequency stabilization module is connected with a local oscillator fiber laser of an optical comb generation module; and the optical phase-locking frequency stabilizing module is used for adjusting the output frequency of the local oscillator fiber laser.
Specifically, the optical phase locking and frequency stabilizing module adopts an optical phase locking technology that the phase locking is realized by adjusting the output power of the local oscillator fiber laser, namely, a "slow loop". The optical phase-locked frequency stabilizing module continuously adjusts the output frequency of the local oscillator fiber laser through tracking the frequency drift of the first signal comb teeth of the signal optical comb and the first local oscillator comb teeth of the local oscillator optical comb, so that the frequency of the first local oscillator comb teeth of the local oscillator optical comb is more and more close to the frequency of the first signal comb teeth of the signal optical comb until the frequency of the first local oscillator comb teeth is aligned with the frequency of the first signal comb teeth.
The broadband channelized receiver provided by the embodiment of the invention is connected with the local oscillator fiber laser of the optical comb generation module through the optical phase-locked frequency stabilization module, and the output power of the local oscillator fiber laser is adjusted to keep the first signal comb teeth of the signal optical comb and the first local oscillator comb teeth of the local oscillator optical comb in frequency alignment, so that the frequency comb teeth on the left side and the right side of the central frequency of the signal optical comb and the local oscillator optical comb can be fully utilized, the frequency spectrum utilization rate of the comb teeth of the optical comb is improved, and the requirement on the number of the comb teeth of the optical comb is reduced.
Based on any of the above embodiments, in the broadband channelized receiver, the optical phase-locked frequency stabilization module is respectively connected to the local oscillator output port of the optical comb generation module and the demultiplexing input port of the linear modulation and demultiplexing module; the local oscillator optical comb output by the local oscillator output port is input to the demultiplexing input port after the phase of the local oscillator optical comb is adjusted by the optical phase-locking and frequency-stabilizing module; the optical phase-locking frequency stabilization module is connected with a local oscillator fiber laser of the optical comb generation module; and the optical phase-locking frequency stabilizing module is used for adjusting the output frequency of the local oscillator fiber laser.
Fig. 3 is a schematic structural diagram of a broadband channelized receiver according to an embodiment of the present invention, and as shown in fig. 3, the optical phase-locked frequency stabilization module includes an optical coupler, a photodetector, a reference signal source, a phase frequency detector, a loop Filter (L oop Filter, L P), a Voltage Controlled Oscillator (VCO), an acousto-optic frequency Shifter (AOFS), and a Piezoelectric ceramic driver (PZT). after the optical signal comb and the optical de-multiplexer pass through the linear modulation and demodulation module, a part of signal power of a first signal comb tooth of the optical signal comb and a part of power of a first local Oscillator comb tooth of the local Oscillator optical comb are input to the optical phase-locked frequency stabilization module through the optical coupler, and other signal comb teeth of the optical signal comb and other local Oscillator comb teeth of the optical comb are input to the orthogonal frequency mixing and demodulation module in pairs, for example, a part of signal power of the first signal comb tooth of the optical signal comb and a part of power of the first local Oscillator comb are input to the optical phase-locked frequency stabilization module, and a part of the local Oscillator signal power of the first signal comb tooth of the optical comb and the local Oscillator comb are input to the orthogonal frequency stabilization and demodulation module, and a local Oscillator signal power of the optical comb and a local Oscillator signal of the optical comb and a local Oscillator signal of the optical comb enter the optical comb 90% of.
The photoelectric detector carries out beat frequency on a first signal comb tooth of the signal optical comb and a first local oscillator comb tooth of the local oscillator optical comb to generate beat frequency signals, namely, the frequency difference between the first signal comb tooth of the signal optical comb and the first local oscillator comb tooth of the local oscillator optical comb. The phase frequency detector compares the phase of the beat signal with the standard sinusoidal signal generated by the reference signal source, and one path of the generated error signal passes through the loop filter and then is fed back to the acousto-optic frequency shifter through the voltage-controlled oscillator, namely a 'fast loop'; the other path is fed back to the local oscillator fiber laser through the piezoelectric ceramic driver, namely, the slow ring.
In the embodiment of the invention, the optical phase-locking and frequency-stabilizing module adopts a composite optical phase-locked loop, and realizes phase locking by simultaneously setting a 'fast loop' and a 'slow loop'. The acousto-optic frequency shifter adjusts the phase of the first local oscillation comb tooth of the local oscillation optical comb by tracking the phase difference between the first signal comb tooth of the signal optical comb and the first local oscillation comb tooth of the local oscillation optical comb, and the phase locking range of the first signal comb tooth and the first local oscillation comb tooth is obtained. Meanwhile, the output frequency of the local oscillator fiber laser is adjusted through the piezoelectric ceramic driver, so that the phase difference between the first signal comb teeth and the first local oscillator comb teeth is always kept within the phase-locked range.
According to the broadband channelized receiver provided by the embodiment of the invention, the composite light phase-locked loop technology is adopted, so that the phase noise caused by frequency drift of two lasers is eliminated, a stable phase relation is formed between the signal optical comb and the local oscillator optical comb, the frequency comb teeth on the left side and the right side of the central frequency of the signal optical comb and the local oscillator optical comb can be fully utilized, the frequency spectrum utilization rate of the comb teeth of the optical comb is improved, and the requirement on the number of the comb teeth of the optical comb is reduced.
Based on any of the above embodiments, in the broadband channelized receiver, the orthogonal frequency mixing and demodulating module performs orthogonal frequency mixing and demodulation on each signal comb tooth of the signal optical comb and each local oscillator comb tooth of the local oscillator optical comb to obtain a channel received signal of each channel; the bandwidth of any channel is the difference between the frequency interval of the local oscillation comb teeth of the local oscillation optical comb and the frequency interval of the signal comb teeth of the signal optical comb; the frequency range of the signal received in any channel is determined based on the frequency difference between the local oscillator comb teeth and the signal comb teeth corresponding to the channel and the bandwidth of the channel.
Specifically, the wideband channelized receiver provided in the embodiment of the present invention disassembles different frequency segments of a wideband radio frequency signal in a multi-channel manner, and performs down-conversion on radio frequency signals within a range of each channel. And after demultiplexing, the signal optical comb and the local oscillator optical comb enter the orthogonal frequency mixing and demodulating module in pairs, and after orthogonal frequency mixing and demodulation, the intermediate frequency signal after down-conversion of each channel can be obtained. Preferably, the quadrature mixing and demodulating module includes quadrature mixing and demodulating sub-modules corresponding to a plurality of signal channels, and each quadrature mixing and demodulating sub-module includes a quadrature optical mixer and two balanced receiving detectors.
Because the optical phase-locking frequency stabilization module enables the signal optical comb and the local oscillator optical comb to have a stable phase relationship, on the basis, the orthogonal frequency mixing and demultiplexing unit sets the channel bandwidth as the difference between the frequency interval of the local oscillator comb teeth of the local oscillator optical comb and the frequency interval of the signal comb teeth of the signal optical comb, so as to ensure the seamless splicing of signal frequency spectrums of all channels. Further, the frequency range of the signal received by the channel may be determined by the frequency difference between the comb teeth of the local oscillator optical comb and the comb teeth of the corresponding signal optical comb, and the channel bandwidth.
According to the broadband channelized receiver provided by the embodiment of the invention, through carrying out orthogonal frequency mixing and demodulation on the signal optical comb and the local oscillator optical comb, the problems of signal aliasing, wide filter band width and unstable center wavelength generated in the periodic filtering process are avoided, and meanwhile, through reasonably setting the channel bandwidth, the seamless splicing of frequency spectrums of all channels is ensured.
In the wideband channelized receiver according to any of the above embodiments, the frequency range f of the signal received in the channelbandAs shown in the following formula:
in the formula (f)ΔAnd k is the serial number of the channel and β is the bandwidth, wherein k is the fixed frequency difference between the first signal comb and the first local oscillator comb.
Specifically, the frequency difference between the kth signal comb tooth of the signal optical comb and the kth local oscillator comb tooth of the local oscillator optical comb is fΔ+(k-1)(lo-sig) When the channel bandwidth is β ═lo-sigWhen, the above frequency difference may be equivalent to fΔ+(k-1)β。
The broadband channelized receiver provided by the embodiment of the invention determines the frequency range of the signal received by any channel through the frequency difference between the comb teeth of the local oscillator optical comb and the corresponding comb teeth of the signal optical comb and the channel bandwidth.
Based on any of the above embodiments, in the broadband channelized receiver, the optical comb generation module includes a signal optical comb generation submodule and a local oscillator optical comb generation submodule; the signal optical comb generation submodule is used for generating a signal optical comb based on laser emitted by a signal optical fiber laser, and the local oscillator optical comb generation submodule is used for generating a local oscillator optical comb based on laser emitted by a local oscillator optical fiber laser.
Specifically, the optical comb generation module comprises a signal optical comb generation submodule and a local oscillator optical comb generation submodule, the signal optical fiber laser emits laser to the signal optical comb generation submodule, and the signal optical comb is generated by the signal optical comb generation submodule; the local oscillator fiber laser transmits laser to the local oscillator optical comb generation submodule, and the local oscillator optical comb is generated through the local oscillator optical comb generation submodule, wherein the laser wavelength transmitted by the signal fiber laser is different from that transmitted by the local oscillator fiber laser. Preferably, the signal optical comb generation submodule and the local oscillator optical comb generation submodule both include: the device comprises an electro-optical phase modulator, an intensity modulator, a phase shifter, an electric power amplifier, an electric coupler and a microwave signal source, wherein the frequencies of electric signals generated by the microwave signal source of a signal optical comb generation submodule and a local oscillator optical comb generation submodule are different.
According to the broadband channelized receiver provided by the embodiment of the invention, the signal optical comb and the local oscillator optical comb are respectively generated by the signal optical comb submodule and the local oscillator optical comb submodule, and the signal optical fiber laser and the local oscillator optical fiber laser with different wavelengths are arranged, so that the comb tooth power of a single optical comb is improved, and the signal-to-noise ratio of a channelized signal is further improved.
Based on any of the above embodiments, in the wideband channelized receiver, the linear modulation and demultiplexing module includes a linear modulation submodule and a demultiplexing submodule; the linear modulation submodule is used for linearly modulating a received broadband radio frequency signal to the signal optical comb, and the demultiplexing submodule is used for demultiplexing the local oscillator optical comb and the linearly modulated signal optical comb.
Specifically, the linear modulation and demultiplexing module comprises a linear modulation submodule and a demultiplexing submodule, preferably, the linear modulation submodule comprises an electro-optical linear intensity modulator, and the demultiplexing submodule comprises two erbium-doped fiber amplifiers and two waveguide array gratings. After the signal optical comb generation submodule generates the signal optical comb, the electro-optical linear intensity modulator linearly modulates the broadband radio-frequency signal to be received onto the signal optical comb, and the signal optical comb is used as a carrier to carry the broadband radio-frequency signal. After the signal optical comb and the local oscillator optical comb enter the demultiplexing module, the two erbium-doped optical fiber amplifiers respectively amplify the optical power of the signal optical comb and the local oscillator optical comb, and then the two waveguide array gratings respectively perform filtering separation on the signal optical comb and the local oscillator optical comb.
According to the broadband channelized receiver provided by the embodiment of the invention, a received broadband radio-frequency signal is modulated onto a signal optical comb through a linear modulation module, a demultiplexing module demultiplexes the signal optical comb and a local oscillator optical comb, different frequency sections of the broadband radio-frequency signal are disassembled in a multi-channel mode, and down-conversion is carried out on the radio-frequency signal in each channel range, so that channelized reception of the broadband radio-frequency signal is realized.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A broadband channelized receiver is characterized by comprising an optical phase-locked frequency stabilization module, an optical comb generation module, a linear modulation and demultiplexing module and an orthogonal frequency mixing and demodulation module which are sequentially connected;
the optical comb generating module is used for respectively generating a signal optical comb and a local oscillator optical comb based on laser emitted by two optical fiber lasers with different wavelengths, and the optical phase-locking and frequency-stabilizing module is used for keeping the frequency alignment of a first signal comb tooth of the signal optical comb and a first local oscillator comb tooth of the local oscillator optical comb.
2. The wideband channelized receiver of claim 1 wherein the optical phase-locked frequency stabilization module is connected to the linear modulation and demultiplexing module;
and the linear modulation and demultiplexing module inputs partial signal power of the first signal comb teeth of the signal optical comb and partial local oscillator power of the first local oscillator comb teeth of the local oscillator optical comb to the optical phase-locked frequency stabilization module so that the optical phase-locked frequency stabilization module can keep the frequencies of the first signal comb teeth of the signal optical comb and the first local oscillator comb teeth of the local oscillator optical comb aligned based on the partial signal power and the partial local oscillator power.
3. The wideband channelized receiver according to claim 2, wherein the optical phase-locked frequency stabilization module is respectively connected to the local oscillator output port of the optical comb generation module and the demultiplexing input port of the linear modulation and demultiplexing module;
and the local oscillator optical comb output by the local oscillator output port is input to the demultiplexing input port after the phase of the local oscillator optical comb is adjusted by the optical phase-locking and frequency-stabilizing module.
4. The broadband channelized receiver according to claim 2 or 3, wherein the optical phase-locked frequency stabilization module is connected with a local oscillator fiber laser of the optical comb generation module;
and the optical phase-locking frequency stabilization module is used for adjusting the output frequency of the local oscillator fiber laser.
5. The wideband channelized receiver of claim 1 wherein the quadrature mixing and demodulating module performs quadrature mixing and demodulation on each signal comb of the signal-optical comb and each local oscillator comb of the local oscillator-optical comb to obtain a channel receive signal of each channel;
the bandwidth of any channel is the difference between the frequency interval of the local oscillation comb teeth of the local oscillation optical comb and the frequency interval of the signal comb teeth of the signal optical comb;
the frequency range of the signal received in any channel is determined based on the frequency difference between the local oscillator comb teeth corresponding to any channel and the signal comb teeth and the bandwidth of any channel.
6. The wideband channelized receiver of claim 5 wherein the frequency range f of the signal received in either channelbandAs shown in the following formula:
in the formula (f)ΔAnd k is a fixed frequency difference between the first signal comb teeth and the first local oscillator comb teeth, k is a serial number of any one channel, and β is a bandwidth.
7. The wideband channelized receiver according to claim 1, wherein the optical comb generation module comprises a signal optical comb generation sub-module and a local oscillator optical comb generation sub-module;
the signal optical comb generation submodule is used for generating the signal optical comb based on laser emitted by a signal optical fiber laser, and the local oscillator optical comb generation submodule is used for generating the local oscillator optical comb based on laser emitted by a local oscillator optical fiber laser.
8. The wideband channelized receiver of claim 1 wherein said linear modulation and demultiplexing module comprises a linear modulation sub-module and a demultiplexing sub-module;
the linear modulation submodule is used for linearly modulating a received broadband radio frequency signal to the signal optical comb, and the demultiplexing submodule is used for demultiplexing the local oscillator optical comb and the linearly modulated signal optical comb.
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