CN115765882A - Microwave photon channelized receiving device and method based on acousto-optic frequency shifter cascade connection - Google Patents
Microwave photon channelized receiving device and method based on acousto-optic frequency shifter cascade connection Download PDFInfo
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Abstract
The invention provides a microwave optical sub-channelized receiving device based on acousto-optic frequency shifter cascade connection, which divides an optical carrier output by a laser into two paths, wherein one path carries out electro-optic modulation on a broadband radio frequency signal and then is shunted, 2n paths of radio frequency optical signals are output, the other path carries out electro-optic modulation on a local oscillator signal, then the local oscillator signal is subjected to primary acousto-optic frequency shift, and then is shunted, secondary acousto-optic frequency shift and wavelength division demultiplexing, and then the 2n paths of local oscillator optical signals with fixed frequency intervals are obtained at different output ports; the array optical signal and the radio frequency optical signal are input into a coherent optical detection array together, and then are subjected to 90-degree electric bridge coupling and band-pass filtering, and finally channelized reception is achieved. The center frequency of the sub-channel is tuned by adjusting the primary acousto-optic frequency shift quantity, and the bandwidth of the sub-channel is tuned by adjusting the secondary acousto-optic frequency shift quantity. The invention only needs single-path light wave, does not need optical frequency comb or optical filtering, adopts low-frequency band-pass filtering to realize signal division, and has the advantages of easy implementation, good stability and high reliability.
Description
Technical Field
The invention belongs to the technical field of broadband channelized receiving, and particularly relates to a microwave photon channelized receiving device and method based on acousto-optic frequency shifter cascade connection.
Background
In conventional radar, communication, electronic warfare, etc. systems, electronic techniques are typically employed to process microwave signals. In order to improve system performance, systems such as radar, communication, electronic warfare and the like are developing towards high frequency band and large bandwidth in the future. The instantaneous bandwidth of future signals will reach GHz levels, and it is difficult for conventional electronic techniques to directly process such large bandwidth signals. The channelized receiver can divide the large bandwidth signal into a plurality of narrow band signals to reduce the processing pressure of the back end, thereby indirectly completing the processing of the large bandwidth signal. However, the early channelized receivers are composed of electrical analog devices, and most of them have the problems of poor channel equalization and large hardware volume, weight and power consumption. The digital channelized receiver can solve the problems faced by the electric analog channelized receiver, but is limited by the performance of the existing analog-to-digital converter, and the digital channelized receiver is difficult to meet the processing requirements of high-frequency-band and large-bandwidth signals, so that the further development of systems such as radars, communication, electronic warfare and the like is severely restricted.
As a new interdisciplinary, microwave photonics has the advantages of large bandwidth, low loss, no electromagnetic interference, small volume, light weight and the like. Therefore, microwave photonic technology can be used to develop channelized receivers to solve the difficulties faced by electrically channelized receivers. On one hand, the microwave photon channelized receiver can divide a broadband signal into a plurality of narrowband signals, and on the other hand, the microwave photon channelized receiver can down-convert the plurality of narrowband signals to the same intermediate frequency, so that channelized reception of the same intermediate frequency is realized. The microwave optical sub-channelized receiver well solves the problem faced by the electric channelized receiver. Therefore, in recent years, microwave optical channelized receivers have been receiving much attention from both domestic and foreign researchers.
Up to now, the common microwave optical-wave channelized receivers mainly have the following categories:
(1) Microwave optical sub-channelized receiver based on optical filter group: an optical carrier output by a laser is input into a modulator, the modulator modulates a received broadband signal onto the optical carrier, the modulated optical signal is divided into multiple paths through an optical splitter, each path realizes channel division by utilizing phase-shift chirped grating filters with different center frequencies and the same bandwidth, the optical signals after channel division realize photoelectric conversion through a photoelectric detector, and finally channelized reception of a broadband radio frequency signal is completed.
Although this type of receiver is easy to implement in a practical system, the performance of the channel division depends heavily on the performance of the optical filter. Because the narrow-band optical filter has the problems of difficult tuning of bandwidth and slow attenuation of stop band, the receiver of the type is difficult to realize the tuning of sub-channel bandwidth and the channel division with high isolation between channels.
(2) Microwave photon channelized receiver based on optical frequency comb and periodic optical filter: the interval between the generated comb lines of the optical frequency comb generator is delta OFC A multiline optical frequency comb. The received radio frequency signal is modulated to each comb line of the optical frequency comb through a Mach-Zehnder modulator (MZM), and an optical sideband of the radio frequency signal exists at each comb line. The modulated optical signal is input to the passband with a spacing of delta FPF In the periodic optical filter of (1). Due to different spacing (delta) of the comb lines of the optical-frequency comb and the periodic optical filter band OFC ≠δ FPF ) Therefore, the periodic optical filter can sequentially and respectively filter out optical signals at different frequencies in the optical sidebands of the radio-frequency signals modulated by each comb line. Then, the wavelength division demultiplexer is used for separating the signals in each passband of the periodic optical filter, and the signals are respectively input into the photoelectric detector to realize photoelectric conversion, so that the channelized reception of the broadband signals can be completed.
Although this type of receiver greatly reduces the bulk and weight of the system. However, the periodic optical filter still has the problems of difficult bandwidth tuning, slow stop-band attenuation and unstable passband center frequency, so that the receiver is difficult to realize microwave optical sub-channelized reception with bandwidth tuning, high inter-channel isolation and high stability.
(3) Microwave photon channelized receiver based on two optical frequency combs: the receiver needs two sets of optical frequency comb generators, and the comb lines are respectively separated by delta Sig The signal optical frequency comb and the comb line are separated by delta LO The local oscillator optical frequency comb. The received radio frequency signal is modulated to each comb line of the signal optical frequency comb through a Mach-Zehnder modulator (MZM), and at the moment, an optical sideband of the radio frequency signal exists at each comb line. Because the signal optical frequency comb and the local oscillator optical frequency comb have different comb line intervals (delta) Sig ≠δ LO ) Therefore, each comb line of the local oscillator optical frequency comb is respectively positioned at different frequencies of the modulated optical sideband of the signal optical frequency comb by reasonably setting the initial comb line position and the comb line interval of the local oscillator optical frequency comb. Then, a wavelength division demultiplexer is used for respectively filtering out optical sidebands at different comb lines of a signal optical frequency comb and different comb lines of a local oscillator optical frequency comb, and the optical sidebands and the different comb lines are input into an optical 90-degree coupler and a balanced photoelectric detector for IQ frequency conversion. After the IQ frequency-converted signals are adopted, channel selection can be performed in a digital domain by using digital band-pass filters with the same center frequency and bandwidth.
The working frequency band of the receiver depends on the comb line interval of the optical frequency comb, the channel number depends on the comb line number of the optical frequency comb, and the optical frequency comb with large interval and multiple comb lines is a technical problem in the field of microwave photons, so that the working frequency band and the channel number of the microwave photon channelized receiver are limited, and the implementation difficulty of the receiver is increased seriously.
Disclosure of Invention
The technical problem solved by the invention is as follows: the microwave optical sub-channelized receiving device and method based on the cascade of the acousto-optic frequency shifters overcome the defects of the prior art, can realize the channelized receiving of broadband radio-frequency signals only by a single optical carrier, and are easy to implement, good in stability and high in reliability.
The technical solution of the invention is as follows:
the microwave optical sub-channelized receiving device based on the cascade connection of the acousto-optic frequency shifters comprises an optical carrier generating module, a radio frequency modulation module, a local oscillator modulation module and a channelized output module;
an optical carrier generation module: the system comprises a laser and a 2-port optical splitter, wherein an optical carrier emitted by the laser is split into a first optical carrier and a second optical carrier by the 2-port optical splitter and respectively input to a radio frequency modulation module and a local oscillator modulation module;
the radio frequency modulation module: receiving a radio frequency signal, electro-optically modulating a first optical carrier under the action of the radio frequency signal, and dividing the first optical carrier into 2n paths of radio frequency optical signals to be input to a channelized output module;
the local oscillation modulation module: loading local oscillation signals, performing electro-optical modulation on second optical carriers under the action of the local oscillation signals, performing first-stage acousto-optic frequency shift on the modulated optical carriers, dividing the optical carriers into n paths, performing second-stage acousto-optic frequency shift and dual-channel wavelength division demultiplexing on each path of signals, and inputting 2n paths of local oscillation optical signals with fixed frequency intervals to a channelized output module;
a channelized output module: the device comprises 2n processing units, wherein each processing unit outputs an intermediate frequency microwave signal after performing coherent optical detection and electric coupling on one path of radio frequency optical signal and one path of local oscillator optical signal, outputs 2n paths of intermediate frequency microwave signals with the same center frequency and bandwidth in total, and outputs sub-channel signals with different frequencies after electric filtering.
Preferably, the radio frequency modulation module includes a 1 st mach-zehnder modulator, a 1 st optical amplifier and a 2n port optical splitter;
mach-zehnder modulator No. 1: receiving a first optical carrier, and modulating the first optical carrier into a carrier suppression double-sideband radio frequency optical signal under the action of a radio frequency signal;
1 st optical amplifier: amplifying the double-sideband radio frequency optical signal;
2n port optical splitter: and dividing the amplified double-sideband radio frequency optical signals into 2n paths and inputting the 2n paths of radio frequency optical signals into 2n processing units corresponding to the channelized output module.
Preferably, the local oscillation modulation module includes a 2 nd mach-zehnder modulator, n acousto-optic frequency shifters, a 2 nd optical amplifier, an n-port optical splitter, an optical attenuator, and n dual-channel wavelength division demultiplexers; the n acousto-optic frequency shifters are respectively recorded as the 1 st to the nth acousto-optic frequency shifter;
1 st acousto-optic frequency shifter: performing first-stage acousto-optic frequency shift on the double-sideband local oscillation optical signal, wherein the frequency shift amount is X;
2 nd optical amplifier: amplifying the double-sideband local oscillation optical signals subjected to the first-stage acousto-optic frequency shift;
the n-port optical splitter divides the amplified double-sideband local oscillation optical signals into n paths, the n paths are marked as 1 st path to nth path double-sideband local oscillation optical signals, the 1 st path double-sideband local oscillation optical signals are input into the optical attenuator, the 2 nd path to nth path double-sideband local oscillation optical signals are respectively input into corresponding 2 nd acousto-optic frequency shifters for second-stage acousto-optic frequency shift, each 2 acousto-optic frequency shifters are divided into one group, the frequency shift amount of the 2 acousto-optic frequency shifters of the i group is + i.Y and-i.Y respectively, wherein i =1,2, … (n-1)/2,n is an odd number which is more than or equal to 3; the n-path double-sideband local oscillation optical signals are respectively input into the corresponding double-channel wavelength division de-multiplexer after passing through the optical attenuator or the acousto-optic frequency shifter;
the dual-channel wavelength division demultiplexer decomposes each path of double-sideband local oscillation optical signals into two paths of single-sideband local oscillation optical signals, generates 2n paths of single-sideband local oscillation optical signals with fixed frequency intervals, and inputs the signals into 2n processing units corresponding to the channelized output module.
Preferably, the dc bias voltages of the 1 st mach-zehnder modulator and the 2 nd mach-zehnder modulator are both operated at a minimum point.
Preferably, the wavelength of the optical signal emitted by the laser is located at the intersection of two passband responses of the two-channel wavelength division demultiplexer.
Preferably, the processing unit comprises a coherent optical receiver, a 90-degree electrical bridge and an electrical filter;
the coherent optical receiver performs coherent optical detection on the received double-sideband radio frequency optical signal and the single-sideband local oscillation optical signal to generate two paths of intermediate frequency microwave signals with orthogonal phases;
the 90-degree electric bridge electrically couples two paths of orthogonal intermediate frequency microwave signals into one path of intermediate frequency microwave signal for output, and image signals are suppressed;
the electrical filter filters the intermediate frequency microwave signal according to the frequency of the sub-channel and outputs a sub-channel signal.
Preferably, the attenuation value of the optical attenuator is equal to the insertion loss of the 2 nd to nth acousto-optic frequency shifters.
Preferably, the bandwidth of the 2n intermediate frequency microwave signals output by the channelized output module is equal to Y.
Preferably, the center frequency of the 2n intermediate frequency microwave signals output by the channelized output module is equal to f 1 -f 2 + X +3Y/2, wherein, f 1 Is the center frequency, f, of the radio frequency signal 2 Is the local oscillator signal frequency.
The microwave photon channelized receiving method based on the cascade connection of the acousto-optic frequency shifter comprises the following steps:
(1) An optical carrier output by the laser is divided into a first optical carrier and a second optical carrier through a 2-port optical splitter, the first optical carrier is input to a 1 st Mach-Zehnder modulator, and the second optical carrier is input to a 2 nd Mach-Zehnder modulator; the wavelength of the light wave output by the laser is adjusted to be positioned at the junction of two passband responses of the dual-channel wavelength division demultiplexer,
(2) Loading a received radio frequency microwave signal on a 1 st Mach-Zehnder modulator, adjusting the 1 st Mach-Zehnder modulator to work at a minimum point, modulating a first optical carrier, outputting a carrier suppression double-sideband radio frequency optical signal, amplifying the carrier suppression double-sideband radio frequency optical signal by a 1 st optical amplifier, inputting the amplified carrier suppression double-sideband radio frequency optical signal to a 2n port optical splitter, and dividing the carrier suppression double-sideband radio frequency optical signal into 2n paths, wherein the 2n paths of double-sideband radio frequency optical signals are respectively input to corresponding 2n coherent optical receivers;
(3) Loading a local oscillation signal on a 2 nd Mach-Zehnder modulator, adjusting the 2 nd Mach-Zehnder modulator to work at a minimum point, modulating a downlink optical wave, outputting a carrier suppression double-sideband local oscillation optical signal, performing frequency shift with the frequency shift amount of X by a 1 st acousto-optic frequency shifter, amplifying by a 2 nd optical amplifier, inputting to an n-port optical splitter to be divided into n paths of double-sideband local oscillation optical signals, inputting the 1 st path to an optical attenuator, inputting the 2 nd path to the nth path to corresponding acousto-optic frequency shifters respectively, dividing each 2 acousto-optic frequency shifters into one group, and dividing the frequency shift amount of 2 acousto-optic frequency shifters of the i group into + i.Y and-i.Y respectively, wherein i =1,2, … (n-1)/2; the method comprises the following steps that n paths of double-sideband local oscillation optical signals pass through an optical attenuator or an acousto-optic frequency shifter and then are respectively input into n corresponding double-channel wavelength division demultiplexers, and an upper sideband signal and a lower sideband signal of the paths of double-sideband local oscillation optical signals are respectively output by two output ports of each double-channel wavelength division demultiplexer; single-sideband local oscillation optical signals output by 2n output ports of the n double-channel wavelength division demultiplexers are respectively output to corresponding 2n coherent optical receivers;
(4) Each coherent optical receiver performs photoelectric detection on received double-sideband radio frequency optical signals and single-sideband local oscillation signals to generate two paths of intermediate frequency microwave signals with orthogonal phases, the intermediate frequency microwave signals are electrically coupled into one path of intermediate frequency microwave signals through a 90-degree electric bridge, the intermediate frequency microwave signals generated by the 2n paths of processing units have the same central frequency and bandwidth, and each path of intermediate frequency microwave signals is filtered through a band-pass filter and outputs sub-channel signals with the same central frequency;
(5) The central frequency of the intermediate frequency microwave signal is adjusted by adjusting the frequency shift quantity X, and the bandwidth of the intermediate frequency microwave signal is adjusted by adjusting the frequency shift quantity Y.
Compared with the prior art, the invention has the advantages that:
(1) The invention adopts a two-stage acousto-optic frequency shift cascade structure, and realizes flexible tuning of a working frequency band, a sub-channel center frequency and a sub-channel bandwidth by controlling acousto-optic frequency shift and the frequency of a loaded local oscillator signal;
(2) The invention realizes channel division by adopting microwave low-frequency band-pass filtering, and has good channelization capability; the optical filter or the optical frequency comb is not needed, and the method has the advantages of easy implementation and high reliability.
Drawings
FIG. 1 is a schematic diagram of a flexible microwave photon channelized receiver based on the cascade of acousto-optic frequency shifters according to the present invention;
FIG. 2 is a schematic structural diagram of a microwave photon 6-channel channelized receiving device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a spectrum of an electro-optically modulated RF signal according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a spectrum after local oscillator signal electro-optical modulation according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a spectrum after a first-stage acousto-optic frequency shift according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a spectrum after two-stage acousto-optic frequency shift according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a spectrum after combining a radio frequency optical sideband and a local oscillator optical sideband in a coherent optical receiver according to an embodiment of the present invention;
fig. 8 is an electrical spectrum of different sub-channel output signals according to an embodiment of the present invention.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
As shown in fig. 1, the microwave optical sub-channelized receiving apparatus and method based on acousto-optic frequency shifter cascade includes 2 lasers, 2 port optical splitters, 2 mach-zehnder modulators, 2 optical amplifiers, n acousto-optic frequency shifters, n port optical splitters, 2n port optical splitters, an optical attenuator, n dual-channel wavelength division demultiplexers, 2n coherent optical receivers, 2n 90-degree electrical bridges, and 2n electrical filters. The light wave emitted by the laser enters the 2-port optical splitter and is divided into an upper path and a lower path, the upper path of light wave is input into the Mach-Zehnder modulator 1, the radio-frequency signal is loaded on the Mach-Zehnder modulator 1, the output of the Mach-Zehnder modulator 1 is amplified through the optical amplifier 1 and then is input into the 2 n-port optical splitter and is divided into 2n paths, and each path is respectively input into the coherent optical receiver through the signal input port. The optical signal output by the mach-zehnder modulator 2 is subjected to frequency shift with the frequency shift amount of X by the acousto-optic frequency shifter 1, amplified by the optical amplifier 2, and input to the n-port optical splitter to be divided into n paths. 1 of the n outputs is inputted to an optical attenuator, and the other (n-1) is divided into two equal parts, one part is inputted to an acousto-optic modulator with frequency shift quantity-i x Y, and the other part is inputted to an acousto-optic modulator with frequency shift quantity + i x Y, wherein i =1,2, … (n-1)/2. The optical signals after attenuation and acousto-optic frequency shift are respectively input into a dual-channel wavelength division demultiplexer to separately output upper and lower optical edge signals), and the output of the wavelength division demultiplexer is respectively input into a coherent optical receiver through a local oscillator input port. Two output ends of each coherent optical receiver are respectively connected with two input ends of a 90-degree electric bridge, the output end of the 90-degree electric bridge is connected with an electric filter, and finally, signals of each sub-channel are obtained at the output end of the electric filter.
Specifically, the wavelength of the laser is located at the junction of two channels of the dual-channel wavelength division demultiplexer, the mach- zehnder modulators 1 and 2 work at the minimum point to form upper and lower optical sidebands after carrier suppression, and two ports of the dual-channel wavelength division demultiplexer output the upper and lower optical sidebands respectively.
The Mach-Zehnder modulator 2 is driven by a signal source 1, the acousto-optic frequency shifter 1 is driven by the signal source 2, and the acousto-optic frequency shifters 2-n are driven after being shunted by a signal source 3.
Further, the frequency of the local oscillation signal loaded on the mach-zehnder modulator 2 can be adjusted by changing the central frequency of the signal source 1, so that the tuning of the working frequency band is realized. The tuning of the subchannel center frequency can be realized by changing the center frequency of the signal source 2 to adjust the frequency shift amount X of the acousto-optic frequency shifter 1. The tuning of the sub-channel bandwidth can be realized by changing the center frequency of the signal source 3 to adjust the size of the frequency shift amount Y of the acousto-optic frequency shifter 2-n.
Examples
In this embodiment, the operating frequency of the flexible microwave optical sub-channelized receiving device based on the cascade connection of the acousto-optic frequency shifters is 27.5 to 30.5GHz, the center frequency of the sub-channel is 1GHz, and the bandwidth of the sub-channel is 500MHz.
As shown in fig. 2, the optical fiber includes 2 lasers, 2 port optical splitters, 2 mach-zehnder modulators (MZM), 2 optical amplifiers, 3 acousto-optic frequency shifters (AOM), 3 port optical splitters, 6 port optical splitters, 3 optical attenuators, 3 dual-channel wavelength division demultiplexers (WDM), 6 coherent optical receivers (I/Q receivers), 6 90-degree electrical bridges, and 6 electrical filters.
The specific steps of channelizing the signal by using the channelized receiving device provided by the embodiment are as follows:
the method comprises the following steps: the light wave emitted by the laser enters the 2-port optical splitter and is divided into an upper path and a lower path, and the wavelength of the laser is adjusted to be positioned at the junction of each channel of the dual-channel wavelength division demultiplexer.
Step two: the add light wave is input into the mach-zehnder modulator 1, the radio-frequency signal with the frequency of 27.5-30.5GHz is loaded on the mach-zehnder modulator 1, the working point of the mach-zehnder modulator 1 is adjusted to be the minimum point, and the spectrum output by the modulator at the moment mainly comprises a radio-frequency optical sideband of +/-1 order as shown in fig. 3. The output of the mach-zehnder modulator 1 is amplified by the optical amplifier 1, and then is input into a 6-port optical splitter to be divided into 6 paths, and each path is respectively input into a coherent optical receiver through a signal input port.
Step three: the downlink optical wave is input into the mach-zehnder modulator 2, the local oscillation signal with the frequency of 29GHz is loaded on the mach-zehnder modulator 2, the working point of the mach-zehnder modulator 2 is adjusted to be the minimum point, the spectrum output by the modulator at the moment is shown in figure 4 and mainly comprises +/-1-order local oscillation optical sidebands, and the frequencies are respectively 29GHz and-29 GHz. The output optical signal of the modulator is firstly subjected to frequency shift with frequency shift amount of +250MHz by the acousto-optic frequency shifter 1, the spectrum after the frequency shift is shown in FIG. 5, and it can be seen that the frequency of the local oscillator optical sideband signal after the time frequency shift is changed from 29GHz to-29 GHz to 29.25GHz to-28.75 GHz, and then the local oscillator optical sideband signal is amplified by the optical amplifier 2 and then input to the 3-port optical splitter to be divided into 3 paths.
Step four: the 2 nd path of the 3 paths of outputs is input into an optical attenuator, the attenuation value is equal to the insertion loss of the acousto-optic frequency shifter, the 1 st path is input into an acousto-optic modulator with the frequency shift quantity of-500 MHz, and the 3 rd path is input into an acousto-optic modulator with the frequency shift quantity of +500 MHz. The spectrum after the time frequency shift is shown in fig. 6, and it can be seen that the frequency of the local oscillator optical sideband signal after the second stage of frequency shift is-28.25 GHz, -28.75GHz, -29.25GHz, 28.75GHz, 29.25GHz, and 29.75GHz, respectively.
Step five: the optical signals after attenuation and acousto-optic frequency shift are respectively input into a dual-channel wavelength division demultiplexer, the spectral response of the dual-channel wavelength division demultiplexer is shown in fig. 6, because the wavelength of a laser is positioned at the junction of two channels of the dual-channel wavelength division demultiplexer, and a mach-zehnder modulator 2 works at a minimum point to form an upper optical sideband and a lower optical sideband, two ports of the dual-channel wavelength division demultiplexer respectively output the upper optical sideband and the lower optical sideband, and the optical signals after wavelength division demultiplexing are input into a coherent optical receiver through a local oscillation input port.
Step six: the radio frequency optical sideband and the local oscillator optical sideband are combined in the coherent receiver, and the spectrum after combination is as shown in fig. 7, so that the local oscillator optical sideband signals with different frequencies can realize the respective demodulation of the radio frequency signals of different channels. Two output ends of each coherent light receiver are respectively connected with two input ends of a 90-degree electric bridge, the output end of the 90-degree electric bridge is connected with a band-pass filter, and signals of all sub-channels can be obtained at the output end of the band-pass filter. Fig. 8 shows the electric spectrograms of different channels and the spectral responses of the band-pass filters, and it can be seen that after the electric band-pass filters, signals of different sub-channels can be obtained at different ports respectively.
The frequencies of the upper and lower side bands of the local oscillation signal are respectively +29GHz and-29 GHz, the scheme adopts a structure of a coherent optical receiver, a 90-degree electric bridge and an electric filter to realize that only the right signal of the local oscillation side band is selected, the upper and lower side bands of the local oscillation signal need to select sub-channels 2 and 5, and the frequencies of the side bands of the local oscillation signal need to be shifted to the right by 250MHz according to the requirement that the center frequency of sub-channelization is 1 GHz. Then, the signals after frequency shift are respectively shifted to the left and the right by 500MHz, so that the channelized reception of the sub-channels 6, 1 and 4, 3 can be respectively realized. And finally realizing the signalization receiving of 27.5-30.5GHz to 6 paths of carriers with 1GHz and 500MHz bandwidth.
In summary, the above-mentioned embodiments are merely examples of the present invention, and are not intended to limit the scope of the present invention, and it should be noted that the apparatus can realize tuning of the operating frequency band by adjusting the frequency of the loaded local oscillator signal. The tuning of the center frequency of the sub-channel can be realized by adjusting the frequency shift amount of the first acousto-optic frequency shifter. And the tuning of the sub-channel bandwidth is realized by changing the frequency shift quantity of other acousto-optic frequency shifters. The channelized reception of more sub-channels is realized by changing the number of ports of the optical splitter and correspondingly increasing the number of the acousto-optic frequency shifter, the wavelength division demultiplexer, the optical coherent receiver, the 90-degree electric bridge and the electric filter. It will be apparent to those skilled in the art from this disclosure that various equivalent modifications and substitutions can be made, and changes in parameters such as optical wavelength and carrier frequency power can be made without departing from the scope of the invention.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. The microwave optical sub-channelized receiving device based on the cascade connection of the acousto-optic frequency shifters is characterized by comprising an optical carrier generating module, a radio frequency modulating module, a local oscillator modulating module and a channelized output module;
the optical carrier generation module: the system comprises a laser and a 2-port optical splitter, wherein an optical carrier emitted by the laser is split into a first optical carrier and a second optical carrier by the 2-port optical splitter and respectively input to a radio frequency modulation module and a local oscillator modulation module;
the radio frequency modulation module: receiving a radio frequency signal, electro-optically modulating a first optical carrier under the action of the radio frequency signal, and dividing the first optical carrier into 2n paths of radio frequency optical signals to be input to a channelized output module;
the local oscillator modulation module: loading local oscillation signals, performing electro-optical modulation on second optical carriers under the action of the local oscillation signals, performing first-stage acousto-optic frequency shift on the modulated optical carriers, dividing the optical carriers into n paths, performing second-stage acousto-optic frequency shift and two-channel wavelength division demultiplexing on each path of signals to form 2n paths of local oscillation optical signals with fixed frequency intervals, and inputting the local oscillation optical signals to the channelized output module;
a channelized output module: the device comprises 2n processing units, wherein each processing unit outputs an intermediate frequency microwave signal after performing coherent optical detection and electric coupling on one path of radio frequency optical signal and one path of local oscillator optical signal, outputs 2n paths of intermediate frequency microwave signals with the same center frequency and bandwidth in total, and outputs sub-channel signals with different frequencies after electric filtering.
2. The microwave-optical-subchannel-based reception device based on the cascade of acousto-optical frequency shifters of claim 1, wherein said radio-frequency modulation module comprises a 1 st mach-zehnder modulator, a 1 st optical amplifier and a 2 n-port optical splitter;
mach-zehnder modulator No. 1: receiving a first optical carrier, and modulating the first optical carrier into a carrier suppression double-sideband radio frequency optical signal under the action of a radio frequency signal;
1 st optical amplifier: amplifying the double-sideband radio frequency optical signal;
2n port optical splitter: and dividing the amplified double-sideband radio frequency optical signals into 2n paths and inputting the 2n paths of radio frequency optical signals into 2n processing units corresponding to the channelized output module.
3. The microwave optical sub-channelized receiving device based on the acousto-optic frequency shifter cascade connection of claim 2, wherein the local oscillation modulation module comprises a 2 nd Mach-Zehnder modulator, n acousto-optic frequency shifters, a 2 nd optical amplifier, an n-port optical splitter, an optical attenuator and n dual-channel wavelength division demultiplexers; the n acousto-optic frequency shifters are respectively recorded as the 1 st to nth acousto-optic frequency shifters;
mach 2 zehnder modulator: receiving a second optical wave signal, and modulating the second optical wave signal into a carrier suppression double-sideband local oscillation optical signal under the action of a local oscillation signal;
1 st acousto-optic frequency shifter: performing first-stage acousto-optic frequency shift on the double-sideband local oscillation optical signal, wherein the frequency shift amount is X;
2 nd optical amplifier: amplifying the double-sideband local oscillation optical signal after the first-stage acousto-optic frequency shift;
the n-port optical splitter divides the amplified double-sideband local oscillation optical signals into n paths, the n paths are marked as 1 st path to nth path double-sideband local oscillation optical signals, the 1 st path double-sideband local oscillation optical signals are input into the optical attenuator, the 2 nd path to nth path double-sideband local oscillation optical signals are respectively input into corresponding 2 nd acousto-optic frequency shifters for second-stage acousto-optic frequency shift, each 2 acousto-optic frequency shifters are divided into one group, the frequency shift amount of the 2 acousto-optic frequency shifters of the i group is + i.Y and-i.Y respectively, wherein i =1,2, … (n-1)/2,n is an odd number which is more than or equal to 3; the n paths of double-sideband local oscillation optical signals are respectively input into the corresponding double-channel wavelength division de-multiplexer after passing through the optical attenuator or the acousto-optic frequency shifter;
the dual-channel wavelength division demultiplexer decomposes each path of double-sideband local oscillation optical signals into two paths of single-sideband local oscillation optical signals, generates 2n paths of single-sideband local oscillation optical signals with fixed frequency intervals, and inputs the signals into 2n processing units corresponding to the channelized output module.
4. The acousto-optic frequency shifter cascade-based microwave-optic-channelized reception device of claim 3, wherein the Mach-Zehnder modulator 1 and Mach-Zehnder modulator 2 DC bias voltages are both operated at a minimum point.
5. The acousto-optic frequency shifter cascade based microwave-optic channelized reception device according to claim 4, wherein the wavelength of the optical signal emitted by the laser is located at the intersection of two pass-band responses of the two-channel wavelength-division demultiplexer.
6. The acousto-optic frequency shifter cascade-based microwave-optic channelized reception device according to claim 5, wherein the processing unit comprises a coherent optical receiver, a 90-degree bridge and an electrical filter;
the coherent optical receiver performs coherent optical detection on the received double-sideband radio frequency optical signal and the single-sideband local oscillation optical signal to generate two paths of intermediate frequency microwave signals with orthogonal phases;
the 90-degree electric bridge electrically couples two paths of orthogonal intermediate frequency microwave signals into one path of intermediate frequency microwave signal for output, and image signals are suppressed;
the electrical filter filters the intermediate frequency microwave signal according to the frequency of the sub-channel and outputs a sub-channel signal.
7. The microwave-optical-channelized receiving device based on the cascade of acousto-optic frequency shifters of claim 6, wherein the attenuation value of the optical attenuator is equal to the insertion loss of the 2 nd to nth acousto-optic frequency shifters.
8. The microwave-optical-subchannelization receiving device based on the cascade of acousto-optic frequency shifters of claim 7, wherein the bandwidth of 2n intermediate-frequency microwave signals output by the channelizing output module is equal to Y.
9. The microwave-optical-channelized receiver based on the cascade of acousto-optic frequency shifters of claim 8, wherein the center frequency of 2n intermediate frequency microwave signals outputted from the channelized output module is equal to f 1 -f 2 + X +3Y/2, wherein f 1 Is the center frequency, f, of the radio frequency signal 2 Is the local oscillator signal frequency.
10. The microwave photon channelized receiving method based on the cascade of the acousto-optic frequency shifters, which adopts the microwave photon channelized receiving device based on the cascade of the acousto-optic frequency shifters of claim 9, is characterized by comprising the following steps:
(1) An optical carrier output by the laser is divided into a first optical carrier and a second optical carrier through a 2-port optical splitter, the first optical carrier is input to a 1 st Mach-Zehnder modulator, and the second optical carrier is input to a 2 nd Mach-Zehnder modulator; the wavelength of the light wave output by the laser is adjusted to be positioned at the junction of two passband responses of the dual-channel wavelength division demultiplexer,
(2) Loading a received radio frequency microwave signal on a 1 st Mach-Zehnder modulator, adjusting the 1 st Mach-Zehnder modulator to work at a minimum point, modulating a first optical carrier, outputting a carrier suppression double-sideband radio frequency optical signal, amplifying the carrier suppression double-sideband radio frequency optical signal by a 1 st optical amplifier, inputting the amplified carrier suppression double-sideband radio frequency optical signal to a 2n port optical splitter, and dividing the carrier suppression double-sideband radio frequency optical signal into 2n paths, wherein the 2n paths of double-sideband radio frequency optical signals are respectively input to corresponding 2n coherent optical receivers;
(3) Loading a local oscillation signal on a 2 nd Mach-Zehnder modulator, adjusting the 2 nd Mach-Zehnder modulator to work at a minimum point, modulating a downlink optical wave, outputting a carrier suppression double-sideband local oscillation optical signal, performing frequency shift with the frequency shift amount of X by a 1 st acousto-optic frequency shifter, amplifying by a 2 nd optical amplifier, inputting to an n-port optical splitter to be divided into n paths of double-sideband local oscillation optical signals, inputting the 1 st path to an optical attenuator, inputting the 2 nd path to the nth path to corresponding acousto-optic frequency shifters respectively, dividing each 2 acousto-optic frequency shifters into one group, and dividing the frequency shift amount of 2 acousto-optic frequency shifters of the i group into + i.Y and-i.Y respectively, wherein i =1,2, … (n-1)/2; the method comprises the following steps that n paths of double-sideband local oscillation optical signals pass through an optical attenuator or an acousto-optic frequency shifter and then are respectively input into n corresponding double-channel wavelength division demultiplexers, and an upper sideband signal and a lower sideband signal of the paths of double-sideband local oscillation optical signals are respectively output by two output ports of each double-channel wavelength division demultiplexer; single-sideband local oscillation optical signals output by 2n output ports of the n double-channel wavelength division demultiplexers are respectively output to corresponding 2n coherent optical receivers;
(4) Each coherent optical receiver performs photoelectric detection on received double-sideband radio frequency optical signals and single-sideband local oscillation signals to generate two paths of intermediate frequency microwave signals with orthogonal phases, the intermediate frequency microwave signals are electrically coupled into one path of intermediate frequency microwave signals through a 90-degree electric bridge, the intermediate frequency microwave signals generated by the 2n paths of processing units have the same central frequency and bandwidth, and each path of intermediate frequency microwave signals is filtered through a band-pass filter and outputs sub-channel signals with the same central frequency;
(5) The central frequency of the intermediate frequency microwave signal is adjusted by adjusting the frequency shift quantity X, and the bandwidth of the intermediate frequency microwave signal is adjusted by adjusting the frequency shift quantity Y.
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