CN113872700A - A high-isolation multi-channel microwave photonic up-conversion device and method - Google Patents
A high-isolation multi-channel microwave photonic up-conversion device and method Download PDFInfo
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Abstract
一种高隔离度多通道微波光子上变频装置与方法，包括光频梳产生单元，第一波分复用单元，第一、第二、…、第N电光调制单元，第一、第二、…、第N直流偏置控制单元，第一、第二、…、第N90°电桥，第一、第二、…、第N本振信号源，第二波分复用单元，光放大单元，光电接收单元。本振信号的相邻信号频率间隔与中频信号的带宽相同，实现多路中频信号的同时上变频功能。中频、本振信号以载波抑制单边带调制方式加载到载波光频梳上，控制本振信号的调制系数使残留光载波得到有效抑制，获得上变频信号与本振信号的高度隔离。本发明能够解决传统变频系统带宽小、上变频过程中本振信号残留造成的信道间串扰等问题，可根据应用需求灵活调节上变频的信道数量。
A high-isolation multi-channel microwave photonic up-conversion device and method, comprising an optical frequency comb generating unit, a first wavelength division multiplexing unit, first, second, ..., Nth electro-optic modulation units, first, second, ..., the Nth DC bias control unit, the first, the second, ..., the Nth 90° bridge, the first, the second, ..., the Nth local oscillator signal source, the second wavelength division multiplexing unit, the optical amplifier unit , the photoelectric receiving unit. The frequency interval of the adjacent signal of the local oscillator signal is the same as the bandwidth of the intermediate frequency signal, which realizes the simultaneous up-conversion function of the multi-channel intermediate frequency signal. The IF and LO signals are loaded onto the carrier optical frequency comb in a carrier-suppressed single-sideband modulation mode, and the modulation coefficient of the LO signal is controlled to effectively suppress the residual optical carrier, thereby obtaining a high degree of isolation between the up-converted signal and the LO signal. The invention can solve the problems such as the small bandwidth of the traditional frequency conversion system and the inter-channel crosstalk caused by the residual local oscillator signal in the up-conversion process, and can flexibly adjust the number of up-conversion channels according to application requirements.
Description
Technical Field
The invention belongs to the technical field of radio frequency signal processing, and relates to a high-isolation multichannel microwave photon up-conversion device and method.
Background
The up-down conversion of microwave frequency is one of the important functions of a radio frequency system, and compared with the traditional electrical frequency conversion technology, the microwave photon frequency conversion technology has the advantages of low loss, large bandwidth, high anti-electromagnetic interference characteristic and the like. Particularly, when a broadband multi-channel signal is processed, the advantages of the microwave photon frequency conversion technology are particularly outstanding, and the microwave photon frequency conversion technology has wide application prospects in the fields of satellite communication, mobile communication, radar systems and the like.
The radio frequency forwarding system based on the microwave photon frequency conversion technology can perform channelized segmentation on a received broadband high-frequency signal and perform down-conversion to a processable intermediate frequency band in the signal receiving process, then processes the channelized multi-channel sub-signal in an optical domain or an electrical domain, and the system performs up-conversion on the multi-channel intermediate frequency signal to a high-frequency band required by transmission after the processing is completed. The microwave photon up-conversion technology can realize one-time up-conversion of the intermediate frequency signals of a plurality of channels to a target frequency band, and solves the problems of high system complexity, poor flatness of broadband signals and the like caused by multiple frequency conversion in the traditional electrical frequency conversion technology.
Generally, in a multi-channel microwave photonic frequency conversion system, due to the limited extinction ratio of an electro-optical modulator, even if the multi-channel microwave photonic frequency conversion system works in a carrier suppression modulation state, a certain amount of optical carrier remains, and in the photoelectric conversion process, the remaining optical carrier beats with a first-order sideband of a local oscillation signal to generate a remaining local oscillation signal. The residual local oscillation signal falls into an adjacent channel of the multichannel signal, so that crosstalk between channels is caused, and the communication quality is influenced. Therefore, eliminating the residual local oscillator signal is an urgent problem to be solved in the application of the multichannel microwave photon up-conversion system.
The down conversion function of broadband radio frequency signals is achieved in the prior art [1] (z.z.tang, d.zhu, and s.l.pan, "Coherent optical RF channel with large electromagnetic bands and large in-band interference suppression," j.light.technol., vol.36, No.19, pp.4219-4226, oct.2018.) by using a set of Coherent optical frequency combs. The local oscillator signal and the broadband radio frequency signal are loaded on the two optical frequency combs in a single-sideband modulation mode respectively, the same intermediate frequency down-conversion receiving of the radio frequency signals of different channels is achieved by utilizing a vernier effect, and meanwhile, the suppression of image frequency interference components is achieved by using a 90-degree optical mixer. The scheme is only suitable for the same-intermediate frequency down-conversion of broadband radio frequency signals, and residual local oscillator signals in the up-conversion process cannot be effectively inhibited.
In the prior art [2] (w.j.chen, d.zhu, j.liu, and s.l.pan, "Multi-band RF transmitter based on the polarized multiplexed photonic LOs and mixers," IEEE j.sel.top.quantum electron, vol.27, No.2, pp.7601009, mar.2021.) a transceiver of Multi-channel wideband radio frequency signals is proposed by inputting orthogonal polarization multiplexed local oscillator signals into a dual polarization optical mixer. The scheme also only restrains the image frequency interference component in the down conversion, and the local oscillator signal residue in the up conversion is still higher.
In the prior art [3] (S.Zhu, X.J.Fan, M.Li, N.H.Zhu, and W.Li. "Microwave photonic frequency down-conversion and channel switching for satellite communication," Opt.Lett., vol.45, No.18, pp.5000-5003, Sep,2020.), a multi-channel Microwave photon down-conversion scheme is provided by using a dual-polarization dual-parallel Mach-Zehnder modulator, a radio frequency signal and a local oscillator signal both adopt carrier suppression dual-sideband modulation, and down-conversion output signals in different states can be realized by adjusting the angle of the radio frequency signal and the local oscillator signal entering a polarization controller in front of a photoelectric detector. The scheme is limited by the dual-polarization dual-parallel Mach-Zehnder modulator, can only realize down-conversion of four channels, and does not take optimization measures for various interferences in the frequency conversion process.
Disclosure of Invention
The invention provides a high-isolation multichannel microwave photon up-conversion device and method, which effectively solve the problem of local oscillator signal residue in the background technology and realize the high-isolation multichannel microwave photon up-conversion function.
The technical scheme adopted by the invention for solving the problems is as follows:
a high-isolation multichannel microwave photon up-conversion device, comprising: the optical frequency comb generating unit, the first wavelength division multiplexing unit, the first electro-optic modulation unit, the second electro-optic modulation unit, … …, the Nth electro-optic modulation unit, the first direct current offset control unit, the second direct current offset control unit, … …, the Nth direct current offset control unit, the first 90-degree electric bridge, the second 90-degree electric bridge, … …, the Nth 90-degree electric bridge, the first local oscillator signal source, the second local oscillator signal source, … …, the Nth local oscillator signal source, the second wavelength division multiplexing unit, the optical amplifying unit and the photoelectric receiving unit.
The optical frequency comb generating unit is connected with a first wavelength division multiplexing unit, the first wavelength division multiplexing unit is respectively connected with one end of a first electro-optical modulation unit, one end of a second electro-optical modulation unit and one end of an Nth electro-optical modulation unit, the other end of the first electro-optical modulation unit, the other end of the second electro-optical modulation unit and the other end of the Nth electro-optical modulation unit are connected with a second wavelength division multiplexing unit, the second wavelength division multiplexing unit is sequentially connected with an optical amplification unit and an electro-optical receiving unit, and all the electro-optical units are connected through optical fiber links or integrated optical waveguide links; each electro-optical modulation unit is provided with a 90-degree electric bridge and a direct current bias control unit.
The N paths of carrier optical frequency combs emitted by the optical frequency comb generating unit are divided into N paths by the first wavelength division multiplexing unit and are respectively input to the first electro-optical modulation unit, the second electro-optical modulation unit, … … and the Nth electro-optical modulation unit. The frequency interval of the carrier optical frequency comb emitted by the optical frequency comb generating unit is larger than the radio frequency response bandwidth of the photoelectric receiving unit.
The first 90-degree electric bridge, the second 90-degree electric bridge, the … … and the N90-degree electric bridge are used for equally dividing local oscillation signals sent by the first local oscillation signal source, the second local oscillation signal source, the … … and the N local oscillation signal source into two paths with signals to be frequency-converted of corresponding channels, and generating a 90-degree phase difference so as to meet the phase requirement of the electro-optical modulation unit on input signals when the electro-optical modulation unit works in a carrier suppression single-sideband modulation state. The interval of adjacent signal frequencies of the local oscillator signal is the same as the bandwidth of the intermediate frequency signal.
The first electro-optical modulation unit, the second electro-optical modulation unit, the … … and the Nth electro-optical modulation unit are respectively provided with two radio frequency input ports, two parallel sub electro-optical modulators and a phase modulator. The local oscillator signal and the intermediate frequency signal output by the 90-degree electric bridge shunt circuit are respectively loaded to an upper branch sub electro-optical modulator and a lower branch sub-electro-optical modulator of the electro-optical modulation unit through two radio frequency input ports. The direct-current bias control unit regulates and controls direct-current voltage to enable the two sub-electro-optical modulators to work at the minimum working point, and carrier suppression double-sideband signals are output. The phase modulator applies phase modulation to the carrier suppression double sideband signals output by the sub electro-optical modulator of the lower branch, so that the carrier suppression double sideband signals of the lower branch of the electro-optical modulation unit and the carrier suppression double sideband signals of the upper branch are combined to output carrier suppression single sideband modulation signals.
The second wavelength division multiplexing unit is used for combining the N paths of carrier suppression single-sideband signals and inputting the combined signals to the optical amplification unit, and the N paths of carrier suppression single-sideband signals amplified in the optical domain by the optical amplification unit are transmitted to the photoelectric receiving unit.
And the photoelectric receiving unit is used for receiving the N paths of carrier suppression single-sideband signals amplified by the optical amplifying unit, performing photoelectric conversion and outputting up-conversion signals.
The method for realizing high-isolation multichannel up-conversion based on the microwave photon frequency conversion device comprises the following steps:
the carrier optical frequency comb emitted by the optical frequency comb generating unit is divided into N paths by the first wavelength division multiplexing unit, and the N paths are respectively input into the first electro-optical modulation unit, the second electro-optical modulation unit, … … and the Nth electro-optical modulation unit. And each path of intermediate frequency signal and the local oscillation signal output by the local oscillation signal source of the corresponding channel are equally divided through a 90-degree electric bridge, generate 90-degree phase difference and are respectively input to two radio frequency input ports of the corresponding electro-optical modulation unit.
The first direct current bias control unit controls the first electro-optical modulation unit to work in a carrier suppression single-sideband modulation state and outputs carrier suppression single-sideband modulation signals of intermediate frequency signals and local oscillation signals; the second direct current bias control unit controls the second electro-optical modulation unit to work in a carrier suppression single-sideband modulation state and outputs carrier suppression single-sideband modulation signals of intermediate frequency signals and local oscillation signals; … …, respectively; and the Nth direct current bias control unit controls the Nth electro-optical modulation unit to work in a carrier suppression single-sideband modulation state and outputs carrier suppression single-sideband modulation signals of intermediate frequency signals and local oscillation signals. And the N paths of carrier suppression single sideband signals output by the first electro-optical modulation unit, the second electro-optical modulation unit, … … and the Nth electro-optical modulation unit are input to the second wavelength division multiplexing unit.
The second wavelength division multiplexing unit combines the N paths of carrier suppression single-sideband signals and inputs the signals to the optical amplification unit. The optical amplification unit performs optical domain amplification on the N paths of carrier suppression single-sideband signals combined, then inputs the signals to the photoelectric receiving unit to complete electro-optical conversion, and outputs up-conversion signals.
Setting adjacent signal frequency intervals of N local oscillation signals to be the same as the bandwidth of the intermediate frequency signal, wherein an up-conversion signal output by a first up-conversion channel is connected with an up-conversion signal output by a second up-conversion channel on a frequency spectrum; the up-conversion signal output by the second up-conversion channel is connected with the up-conversion signal output by the third up-conversion channel on the frequency spectrum; and so on, the up-conversion signal output by the N-1 up-conversion channel and the up-conversion signal output by the N up-conversion channel are connected on the frequency spectrum, and the synchronous up-conversion function of the N paths of signals with the intermediate frequency signal is completed.
According to the invention, the local oscillation signal power input to the electro-optical modulation unit is controlled, so that the electro-optical modulation unit works under a certain modulation coefficient, the residual optical carrier component of the output carrier suppression single-side-band signal is effectively suppressed, and finally, the residual local oscillation signal power output by photoelectric conversion tends to zero, and the high isolation between the local oscillation signal and the up-conversion signal is obtained.
The invention has the beneficial effects that: the invention adopts a carrier suppression single sideband modulation method to simultaneously modulate the intermediate frequency signal and the local oscillator signal on the optical frequency comb carrier wave of each channel, and independently sets the frequency of the local oscillator signal of each channel, thereby realizing the synchronous up-conversion function of a plurality of channel signals. By controlling the modulation depth of the local oscillator signals, the residual local oscillator signals after multi-channel frequency conversion are effectively inhibited, high isolation between the local oscillator signals and the up-conversion signals is realized, and the problem of crosstalk between channels is solved.
Drawings
Fig. 1 is a structural diagram of a high-isolation multichannel microwave photon up-conversion device of the present invention.
Fig. 2 is a schematic diagram of the internal structure of the electro-optical modulation unit.
Fig. 3 is a spectral diagram of an optical domain of a carrier-frequency comb emitted by an optical-frequency comb generating unit.
Fig. 4 is a spectral diagram in the optical domain of the carrier suppressed single sideband signal output by the first electro-optical modulation unit.
Fig. 5 is a graph of the optical domain spectrum of the suppressed single sideband modulated signal after being combined by the second wavelength division multiplexing unit.
FIG. 6 is a graph of the spectrum of the up-converted signal output by the optical-electrical receiving unit of the apparatus of the present invention.
Fig. 7 is a constellation diagram of the demodulation of the up-converted signal of the first channel output by the apparatus of the present invention.
Fig. 8 is a frequency spectrum diagram of an up-conversion signal output by the optical-electrical receiving unit under a conventional condition.
Fig. 9 is a constellation diagram for conventional conditional output first channel up-converted signal demodulation.
In fig. 1: 1 an optical frequency comb generating unit; 2 a first wavelength division multiplexing unit; 3 a first electro-optical modulation unit; 4 a second electro-optical modulation unit; 5 an Nth electro-optical modulation unit; 6 a first 90 ° bridge; 7 a second 90 ° bridge; an 8 th 90 ° bridge; 9 a first dc bias control unit; 10 a second dc bias control unit; 11 nth dc bias control unit; 12 a first local oscillator signal source; 13 a second local oscillator signal source; 14, an Nth local oscillation signal source; 15 a second wavelength division multiplexing unit; 16 a light amplification unit; 17 a photo-reception unit.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The high-isolation multichannel microwave photon up-conversion device of the invention is shown in figure 1 and comprises: the optical frequency comb generating unit, the first wavelength division multiplexing unit, the first electro-optical modulation unit, the second electro-optical modulation unit, … …, the Nth electro-optical modulation unit, the first 90-degree bridge, the second 90-degree bridge, … …, the Nth 90-degree bridge, the first direct current bias control unit, the second direct current bias control unit, … …, the Nth direct current bias control unit, the first local oscillator signal source, the second local oscillator signal source, … …, the Nth local oscillator signal source, the second wavelength division multiplexing unit, the optical amplifying unit and the photoelectric receiving unit.
The optical frequency comb generation unit, the first wavelength division multiplexing unit, the first electro-optical modulation unit, the second electro-optical modulation unit, the … …, the Nth electro-optical modulation unit, the second wavelength division multiplexing unit, the optical amplification unit and the photoelectric receiving unit are sequentially connected through an optical fiber link or an integrated optical waveguide link.
Fig. 2 shows a schematic structural diagram of an electro-optical modulation unit, which includes a sub-electro-optical modulator 1, a sub-electro-optical modulator 2, and an electro-optical phase modulator. The sub electro-optical modulator 1 has a radio frequency port 1 and a dc port 1, the sub electro-optical modulator 2 has a radio frequency port 2 and a dc port 2, and the electro-optical phase modulator has a dc port 3.
Examples
The implementation of the present invention is illustrated by taking three-channel microwave photon upconversion as an example. The optical frequency comb generating unit emits 3 carrier optical comb lines with equal power and 100GHz frequency spacing, as shown in fig. 3. The carrier optical frequency comb is input into the first wavelength division multiplexing unit and demultiplexed into three paths of optical frequency comb carriers.
The local oscillator signal and the intermediate frequency signal are loaded on the optical frequency comb carrier wave in a carrier suppression single sideband modulation mode. Taking the first channel as an example, the frequency of the intermediate frequency signal is 0.5GHz, the modulation bandwidth is 450MHz, and the local oscillation signal is 17.75 GHz. The intermediate frequency signal and the local oscillator signal are input into a first 90-degree electric bridge, two paths of radio frequency signals with 90-degree phase difference are output and are respectively transmitted to a radio frequency port 1 and a radio frequency port 2 of the electro-optical modulation unit. The first direct current bias control unit controls the first electro-optical modulation unit to work in a carrier suppression single-sideband modulation state and outputs a carrier suppression single-sideband modulation signal, and the optical domain spectrum is shown in fig. 4.
The intermediate frequency signal input to the second electro-optical modulation unit is frequency 0.5GHz, the modulation bandwidth is 450MHz, the local oscillator signal frequency is 18.25GHz, the intermediate frequency signal input to the third electro-optical modulation unit is frequency 0.5GHz, the modulation bandwidth is 450MHz, and the local oscillator signal frequency is 18.75 GHz. The second electro-optical modulation unit and the third electro-optical modulation unit work in a carrier suppression single-sideband modulation state and output carrier suppression single-sideband modulation signals.
The second wavelength division multiplexing unit combines the single-sideband optical signals of carrier suppression output by the three electro-optical modulation units, and the optical domain spectrum of the single-sideband optical signals is shown in fig. 5. The combined optical signal is amplified by the optical amplifying unit and transmitted to the photoelectric receiving unit, so as to complete photoelectric conversion, and the frequency spectrum of the output electrical signal is shown in fig. 6. As can be seen from fig. 6, the intermediate frequency broadband signals of the three channels are up-converted to 18.025GHz-19.475GHz by the system, and as a residual local oscillator suppression measure is adopted, the local oscillator signal power after up-conversion is low, the up-converted broadband signals are digitally demodulated, the constellation diagram is as shown in fig. 7, the demodulated constellation points are well distributed at the corresponding positions, the error vector magnitude is 5.7%, and good communication quality is achieved.
Meanwhile, an up-conversion system without local oscillation suppression measures is tested, and the up-conversion output frequency spectrum is shown in fig. 8. It can be seen from fig. 8 that the power of the local oscillator signal is high, where the local oscillator signal of 18.25GHz falls within the channel of the up-conversion output of the first channel, the local oscillator signal of 18.75GHz falls within the channel of the up-conversion output of the second channel, and the power of the residual local oscillator signal exceeds the power of the up-conversion signal, which will cause crosstalk between channels. The first channel up-conversion broadband signal output by the photoelectric receiving unit is digitally demodulated, the demodulated constellation diagram is as shown in fig. 9, and as can be seen from fig. 9, the demodulated constellation point does not fall on an expected point, the constellation diagram presents a chaotic state, and the error vector magnitude is 32.9%. Comparing the demodulation results of fig. 7 and fig. 9, it can be known that the wideband signal up-conversion scheme provided by the present invention effectively suppresses the residual local oscillator signal, and realizes a good multi-channel up-conversion function.
The above description is further detailed in connection with the preferred embodiments of the present invention, and it is not intended to limit the practice of the invention to these descriptions. It will be apparent to those skilled in the art that various modifications, additions, substitutions, and the like can be made without departing from the spirit of the invention.
Claims (2)
1. A high-isolation multichannel microwave photon up-conversion device is characterized by comprising: the optical frequency comb generating device comprises an optical frequency comb generating unit (1), a first wavelength division multiplexing unit (2), a first electro-optic modulation unit (3), a second electro-optic modulation unit (4), … …, an Nth electro-optic modulation unit (5), a first 90-degree electric bridge (6), a second 90-degree electric bridge (7), … …, an Nth 90-degree electric bridge (8), a first direct current bias control unit (9), a second direct current bias control unit (10), … …, an Nth direct current bias control unit (11), a first local oscillator signal source (12), a second local oscillator signal source (13), … …, an Nth local oscillator signal source (14), a second wavelength division multiplexing unit (15), an optical amplifying unit (16) and a photoelectric receiving unit (17);
the optical frequency comb generation unit (1) is connected with a first wavelength division multiplexing unit (2), the first wavelength division multiplexing unit (2) is respectively connected with one end of a first electro-optical modulation unit (3), a second electro-optical modulation unit (4) and an Nth electro-optical modulation unit (5), the other end of the first electro-optical modulation unit (3), the second electro-optical modulation unit (4) and the Nth electro-optical modulation unit (5) is connected with a second wavelength division multiplexing unit (15), the second wavelength division multiplexing unit (15) is sequentially connected with an optical amplification unit (16) and an optical receiving unit (17), and the photoelectric units are connected through optical fiber links or integrated optical waveguide links; each electro-optical modulation unit is provided with a 90-degree electric bridge and a direct current bias control unit;
n paths of carrier optical frequency combs emitted by the optical frequency comb generating unit (1) are divided into N paths by the first wavelength division multiplexing unit (2) and are respectively input to the first electro-optical modulation unit (3), the second electro-optical modulation units (4), … … and the Nth electro-optical modulation unit (5); the frequency interval of the carrier optical frequency comb emitted by the optical frequency comb generating unit (1) is larger than the radio frequency response bandwidth of the photoelectric receiving unit (17);
the first 90-degree electric bridge (6), the second 90-degree electric bridge (7), the … … and the N90-degree electric bridge (8) are respectively used for equally dividing local oscillation signals sent by a first local oscillation signal source (12), a second local oscillation signal source (13), a … … and an N local oscillation signal source (14) and signals to be frequency-converted of corresponding channels into two paths and generating a 90-degree phase difference so as to meet the phase requirement of an electro-optical modulation unit working in a carrier suppression single-sideband modulation state on input signals; the interval of adjacent signal frequencies of the local oscillation signal is the same as the bandwidth of the intermediate frequency signal;
the first electro-optical modulation unit (3), the second electro-optical modulation unit (4), the … … and the Nth electro-optical modulation unit (5) are respectively provided with two radio frequency input ports, two parallel sub electro-optical modulators and a phase modulator; local oscillation signals and intermediate frequency signals output by the 90-degree electric bridge shunt circuit are loaded to an upper branch sub electro-optical modulator and a lower branch sub electro-optical modulator of the electro-optical modulation unit through two radio frequency input ports respectively; the direct current bias control unit regulates and controls direct current voltage to enable the two sub electro-optical modulators to work at the minimum working point, and carrier suppression double-sideband signals are output; the phase modulator applies phase modulation to the carrier suppression double sideband signals output by the sub electro-optical modulator of the lower branch, so that the lower branch carrier suppression double sideband signals of the electro-optical modulation unit and the upper branch carrier suppression double sideband signals are combined to output carrier suppression single sideband modulation signals;
the second wavelength division multiplexing unit (15) is used for combining the N paths of carrier suppression single-sideband signals and inputting the combined signals to the optical amplification unit (16), and the N paths of carrier suppression single-sideband signals amplified in the optical domain by the optical amplification unit (16) are transmitted to the photoelectric receiving unit (17);
and the photoelectric receiving unit (17) is used for receiving the N paths of carrier suppression single-sideband signals amplified by the optical amplifying unit (16), performing photoelectric conversion and outputting up-conversion signals.
2. A high-isolation multichannel microwave photon up-conversion method realized based on the frequency conversion device of claim 1 is characterized by comprising the following steps:
the carrier optical frequency comb emitted by the optical frequency comb generating unit (1) is divided into N paths by the first wavelength division multiplexing unit (2), and the N paths are respectively input into the first electro-optical modulation unit (3), the second electro-optical modulation units (4), … … and the Nth electro-optical modulation unit (5); each path of intermediate frequency signal and a local oscillation signal output by a local oscillation signal source of a corresponding channel are equally divided through a 90-degree electric bridge, generate a 90-degree phase difference and are respectively input to two radio frequency input ports of corresponding electro-optical modulation units;
the first direct current bias control unit (9) controls the first electro-optical modulation unit (3) to work in a carrier suppression single-sideband modulation state, and outputs carrier suppression single-sideband modulation signals of intermediate frequency signals and local oscillation signals; the second direct current bias control unit (10) controls the second electro-optical modulation unit (4) to work in a carrier suppression single-sideband modulation state, and outputs carrier suppression single-sideband modulation signals of intermediate frequency signals and local oscillation signals; … …, respectively; the Nth direct current bias control unit (11) controls the Nth electro-optical modulation unit (5) to work in a carrier suppression single-sideband modulation state, and outputs carrier suppression single-sideband modulation signals of intermediate frequency signals and local oscillation signals; n paths of carrier suppression single sideband signals output by the first electro-optical modulation unit (3), the second electro-optical modulation units (4), … … and the Nth electro-optical modulation unit (5) are input to a second wavelength division multiplexing unit (15);
the second wavelength division multiplexing unit (15) combines the N paths of carrier suppression single-sideband signals and inputs the signals to the optical amplification unit (16); the optical amplification unit (16) performs optical domain amplification on the N-channel carrier suppression single-sideband signal of the combiner, inputs the signal to the photoelectric receiving unit (17), completes electro-optical conversion and outputs an up-conversion signal;
setting adjacent signal frequency intervals of N local oscillation signals to be the same as the bandwidth of the intermediate frequency signal, wherein an up-conversion signal output by a first up-conversion channel is connected with an up-conversion signal output by a second up-conversion channel on a frequency spectrum; the up-conversion signal output by the second up-conversion channel is connected with the up-conversion signal output by the third up-conversion channel on the frequency spectrum; and so on, the up-conversion signal output by the N-1 up-conversion channel is connected with the up-conversion signal output by the N up-conversion channel on the frequency spectrum, and the synchronous up-conversion function of N paths of signals with the intermediate frequency is completed;
by controlling the local oscillator signal power input to the electro-optical modulation unit, the electro-optical modulation unit works under a certain modulation coefficient, the residual optical carrier component of the output carrier suppression single-sideband signal is effectively suppressed, and finally, the residual local oscillator signal power output by photoelectric conversion tends to zero, so that the high isolation between the local oscillator signal and the up-conversion signal is obtained.
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