CN114285481B - Dual-band microwave pulse generation device and method based on active mode-locking photoelectric oscillator - Google Patents
Dual-band microwave pulse generation device and method based on active mode-locking photoelectric oscillator Download PDFInfo
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Abstract
The invention relates to a dual-band microwave pulse generating device and method based on an active mode locking photoelectric oscillator, comprising a laser, a DP-BPSK modulator, a dual-port signal generator, a single-mode fiber, a polarization controller, a polarization beam splitter, a first photoelectric detector, a second photoelectric detector, a first microwave amplifier, a second microwave amplifier, a first tunable microwave band-pass filter, a second tunable microwave band-pass filter, a first power divider and a second power divider; and applying a modulation signal with the frequency equal to the integral multiple of the free frequency spectrum range of the loop at the bias point of the DP-BPSK modulator, constructing a double-loop active mode-locking photoelectric oscillator by utilizing a polarization multiplexing technology, and generating microwave pulse signals with adjustable two different frequency bands, repetition frequency and carrier frequency and low phase noise by adjusting the center frequency of the tunable microwave band-pass filter.
Description
Technical Field
The invention belongs to the technical field of microwave photon signal generation, and particularly relates to a dual-band microwave pulse generation device and method based on an active mode locking photoelectric oscillator.
Background
The dual-band radar is widely applied to both domestic and foreign military and civil fields, and the dual-band microwave pulse signal generation technology is always a hot spot of leading edge research as a core technology of the dual-band radar. To achieve high performance object detection, imaging, identification and classification, the output pulse signal has a large bandwidth and low time jitter. In addition, for the dual-band radar signal, because the signals of the two frequency bands share the same set of data processing back end, the coherence requirement on the signals of the two frequency bands is higher. However, the conventional microwave signal generation technology based on the electronic technology is difficult to realize the generation of the microwave pulse signal with high frequency, large bandwidth and high stability.
As a cross subject of combining microwave technology and photonics technology, the microwave photonics not only integrates the advantages of large optical bandwidth and low loss electromagnetic interference resistance, but also combines the mature technology of the existing microwave field, and is widely applied to the fields of optical carrier wireless communication, radar systems and satellite communication. The photoelectric oscillator is a very typical microwave photon technology product, has the unique advantage of low phase noise in the aspect of signal generation, and has great application prospect in the fields of radar, communication and the like. The optoelectronic oscillators studied at present are mostly used for generating single-frequency signals, and multi-mode co-oscillation cannot be achieved even if a wide band-pass filter is added in the loop because of the existence of mode competition. Mode locking techniques inspired in lasers, passive mode locking and active mode locking techniques were introduced into optoelectronic oscillators in 2011 and 2020, respectively. Mode locking technology can excite oscillation modes in the passband of a bandpass filter simultaneously by locking the phase relationship between the oscillation modes in the optoelectronic oscillator, and the modes can oscillate simultaneously when the gain in the loop meets the oscillation condition, thereby generating microwave pulses. The microwave pulse generated by the scheme has the characteristics of high carrier frequency, high stability and low noise. However, the existing active mode locking photoelectric oscillation technology can only generate microwave pulses in a single frequency band and is not suitable for the application requirements of double-frequency-band radars and the like.
In view of the above-described problems, improvements are needed.
Disclosure of Invention
The invention provides a dual-band microwave pulse generating device and method based on an active mode-locking photoelectric oscillator. The bias port of the DP-BPSK modulator is controlled by a sine signal with direct current bias so as to realize the modulation of loop gain, and an active mode-locked photoelectric oscillator is constructed; and realizing dual-band pulse output by using a polarization multiplexing technology. By setting the frequency of the sinusoidal signal loaded to the offset port, the repetition frequency of the output pulses of the two frequency bands can be respectively changed, and the center frequency of the tunable bandpass filter can be changed to control the carrier frequency of the microwave pulses.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a dual-band microwave pulse generating device based on an active mode-locking photoelectric oscillator comprises a laser, a DP-BPSK modulator, a dual-port signal generator, a single-mode optical fiber, a polarization controller, a polarization beam splitter, a first photoelectric detector, a second photoelectric detector, a first microwave amplifier, a second microwave amplifier, a first tunable microwave band-pass filter, a second tunable microwave band-pass filter, a first power divider and a second power divider; the double-frequency-band microwave pulse generating device based on the active mode-locking photoelectric oscillator comprises A, B two feedback loops and correspondingly outputs microwave pulses of two frequency bands; in the common part of the two loops, the laser outputs continuous light as carrier waves to be input into the DP-BPSK modulator, the two sine signals with direct current bias generated by the dual-port signal generator are output to two bias ports of the DP-BPSK modulator, the two microwave input ports of the DP-BPSK modulator are respectively connected with the output ends of the first electric power divider and the second electric power divider, the optical output port of the DP-BPSK modulator outputs two modulated signals with mutually orthogonal polarization states, the modulated signals pass through the single-mode optical fiber and are input to the polarization beam splitter after being aligned by the polarization controller, the optical signal is divided into two paths according to the polarization state by the polarization beam splitter, the optical signal entering the loop A is converted into an electric signal by the first photoelectric detector, the electric signal output by the first photoelectric detector is respectively amplified by the first microwave amplifier and the first tunable microwave band-pass filter, and then is input into the first power divider, the output end of the first power divider is fed back to one radio frequency modulation port of the DP-BPSK modulator, the closed loop of the feedback loop of the active mode-locking photoelectric oscillator is completed, and the other output port of the first power divider outputs microwave pulse a of one frequency band; the optical signal entering the loop B is converted into an electric signal through the second photoelectric detector, the electric signal output by the second photoelectric detector is respectively amplified by the second microwave amplifier and the second tunable microwave band-pass filter and then is input into the second power divider after frequency band selection, the output end of the second power divider is fed back to the other radio frequency modulation port of the DP-BPSK modulator, the closed loop of the feedback loop of the active mode-locking photoelectric oscillator is completed, and the other output port of the second power divider outputs microwave pulse B with the other frequency band.
As a preferable scheme of the invention, the DP-BPSK modulator is an integrated modulator, and has two radio frequency ports, two bias ports, two electro-optical intensity modulators connected in parallel, and polarization states of two optical signals are mutually orthogonal.
A dual-band microwave pulse generation method based on an active mode-locking photoelectric oscillator comprises the following steps:
step 1: the optical signals output by the laser are divided into two paths of optical signals with mutually orthogonal polarization states in the DP-BPSK modulator, the two paths of optical signals are modulated by two electro-optical intensity modulators built in the DP-BPSK modulator respectively, and the modulated optical signals are output after polarization beam combination;
step 2: the dual-port signal generator is used for generating two sine signals with direct current bias, a bias port of the DP-BPSK modulator is connected to the output end of the dual-port signal generator, and a radio frequency signal is connected to the bias port for modulating the gains of the two loops, so that active mode locking is realized;
step 3: the optical signals output by the DP-BPSK modulator are transmitted through a section of single mode fiber and then are input to the polarization beam splitter after being aligned by the polarization controller, the polarization beam splitter divides the input optical signals into two paths according to the polarization states, and the polarization states of the two paths of output optical signals are mutually orthogonal;
step 4: the optical signal input into the loop A is converted into an electric signal through a first photoelectric detector, then the electric signal passes through a first microwave amplifier and a first tunable microwave band-pass filter in sequence, power amplification and frequency band selection of the electric signal are respectively realized, and the output microwave signal is output and fed back to a radio frequency modulation port of the DP-BPSK modulator through a first power divider part to form a complete photoelectric oscillation loop A; the optical signal input into the loop B is converted into an electric signal through a second photoelectric detector, and then sequentially passes through a second microwave amplifier and a second tunable microwave band-pass filter to respectively realize power amplification and frequency band selection of the electric signal, and the output electric signal is output and fed back to the DP-BPSK modulator through a second electric power divider part to form a complete photoelectric oscillation loop B.
As a preferred embodiment of the present invention, the signal generated by the dual port rf generator needs to satisfy:
V A (t)＝V+V 0 ·cos(2πN 1 f 0 t)
V B (t)＝V+V 0 ·cos(2πN 2 f 0 t)
wherein V is the direct current bias voltage of superposition of two radio frequency signals, V 0 Amplitude, N of sinusoidal signal 1 And N 2 Is a positive integer, f 0 Is the free spectral range of the optoelectronic oscillator; by varying the output frequency of the dual-port signal generator, i.e. controlling N 1 、N 2 Can respectively adjust the pulse repetition frequency of the generated microwave pulse sequences a and b, wherein the pulse repetition frequency of the microwave pulse sequences a and b is N 1 f 0 、N 2 f 0 。
As a preferred embodiment of the present invention, the carrier frequencies of the output microwave pulse a and the output microwave pulse b may be controlled by adjusting the center frequencies of the first tunable microwave band-pass filter and the second tunable microwave band-pass filter, respectively.
The beneficial effects of the invention are as follows:
1. the active mode locking technology is adopted to lock the phase of the longitudinal mode in the cavity of the photoelectric oscillator, so that stable multimode oscillation is realized, and the repetition frequency of the output pulse sequence is an integral multiple of the frequency interval between the adjacent longitudinal modes.
2. The dual-band pulse sequence output is realized by adopting a dual-loop structure, and the carrier frequency of the output microwave pulse can be changed by adjusting the center wavelength of a band-pass filter in each loop; the pulse repetition rates of the output microwave pulses a and b can be controlled by controlling the frequency of the sinusoidal signal loaded to the dc offset port, respectively.
3. The DP-BPSK modulator and the polarization beam splitter are adopted to realize polarization multiplexing, so that the upper oscillation loop and the lower oscillation loop share the same section of single-mode fiber, the whole system is simpler and more compact in structure, and the output microwave pulse a and the output microwave pulse b have better coherence.
Drawings
Fig. 1: a block diagram of a dual-band microwave pulse generating device based on an active mode-locking photoelectric oscillator;
fig. 2: double-frequency-band microwave pulse generating device and method based on active mode-locking photoelectric oscillator;
fig. 3: a spectrogram and a time domain diagram of the fundamental frequency mode locking microwave pulse a;
fig. 4: a spectrogram and a time domain diagram of the fundamental frequency mode locking microwave pulse b;
fig. 5: a spectrogram and a time domain diagram of a second-order harmonic mode-locked microwave pulse a;
fig. 6: a spectrogram and a time domain diagram of the second-order harmonic mode-locked microwave pulse b;
fig. 7: generating a multiple spectrum overlay of the microwave pulse based on the tunable filter;
reference numerals in the drawings: the dual-port optical power divider comprises a laser 1, a DP-BPSK modulator 2, a dual-port signal generator 3, a single-mode optical fiber 4, a polarization controller 5, a polarization beam splitter 6, a first photoelectric detector 7, a second photoelectric detector 8, a first microwave amplifier 9, a second microwave amplifier 10, a first tunable microwave band-pass filter 11, a second tunable microwave band-pass filter 12, a first power divider 13 and a second power divider 14.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein, fig. 1: a block diagram of a dual-band microwave pulse generating device based on an active mode-locking photoelectric oscillator; fig. 2: double-frequency-band microwave pulse generating device and method based on active mode-locking photoelectric oscillator; fig. 3: a spectrogram and a time domain diagram of the fundamental frequency mode locking microwave pulse a; fig. 4: a spectrogram and a time domain diagram of the fundamental frequency mode locking microwave pulse b; fig. 5: a spectrogram and a time domain diagram of a second-order harmonic mode-locked microwave pulse a; fig. 6: a spectrogram and a time domain diagram of the second-order harmonic mode-locked microwave pulse b; fig. 7: a multiple spectral overlay of the microwave pulse is generated based on the tunable filter.
The system principle of the present invention is further described below with reference to fig. 2:
as shown in fig. 1, a dual-band microwave pulse generating device based on an active mode-locked photoelectric oscillator comprises a laser 1, a DP-BPSK modulator 2, a dual-port signal generator 3, a single-mode optical fiber 4, a polarization controller 5, a polarization beam splitter 6, a first photoelectric detector 7, a second photoelectric detector 8, a first microwave amplifier 9, a second microwave amplifier 10, a first tunable microwave bandpass filter 11, a second tunable microwave bandpass filter 12, a first electric power divider 13 and a second electric power divider 14; the double-frequency-band microwave pulse generating device based on the active mode-locking photoelectric oscillator comprises A, B two feedback loops, and correspondingly outputs microwave pulses of two frequency bands; in the public part of two loops, the laser 1 outputs continuous light as carrier wave to the DP-BPSK modulator 2, the two sinusoidal signals with DC bias of the dual-port signal generator 3 are output to two bias ports of the DP-BPSK modulator 2, the two microwave input ports of the DP-BPSK modulator 2 are respectively connected with the output ends of the first power divider 13 and the second power divider 14, the optical output port of the DP-BPSK modulator 2 outputs two modulated signals with mutually orthogonal polarization states through the single-mode fiber 4, the modulated signals are input to the polarization beam splitter 6 after being aligned by the polarization controller 5, the optical signals are divided into two paths according to the polarization states, the optical signals entering the loop A are converted into electric signals by the first photoelectric detector 7, the electric signals output by the first photoelectric detector 7 are respectively amplified by the first microwave amplifier 9 and the first tunable filter 11 and then are respectively subjected to the first power divider 13 and the first power divider 13, and the other power divider 13 is output to the other power divider 13, and the other power divider 13 is modulated by the first power divider and the second power divider, and the other power divider 13 is switched back to the other power divider is switched to the power divider, and the power divider is switched to the power signal is switched to the electric signal; the optical signal entering the loop B is converted into an electrical signal by the second photodetector 8, the electrical signal output by the second photodetector 8 is amplified by the second microwave amplifier 10 and the second tunable microwave band-pass filter 12, and then is input into the second power divider 14 after frequency band selection, the output end of the second power divider 14 is fed back to the other radio frequency modulation port of the DP-BPSK modulator 2, so as to complete the closed loop of the feedback loop of the active mode-locked optoelectronic oscillator, and the other output port of the second power divider 14 outputs a microwave pulse B in the other frequency band.
The optical signal output by the laser is input into the DP-BPSK modulator as a carrier wave, and the two DC bias ports of the modulator are controlled by the sine signal generated by a dual-port signal generator. The optical carrier is divided into an upper path and a lower path in the DP-BPSK modulator, the upper path and the lower path are respectively modulated by signals fed back by the A, B loops, one path of modulated optical signal is exactly orthogonal to the other path of optical signal in polarization state through a 90-degree optical rotatory device, and finally the modulated optical signal is output by combining beams at an output port of the DP-BPSK modulator. The output optical signals pass through a section of single mode fiber, and two optical signals with mutually orthogonal polarization states are separated by a polarization beam splitter after being aligned by a polarization controller. The separated optical signals are subjected to photoelectric conversion, amplification and filtering in a loop A and a loop B respectively, and finally fed back to a radio frequency modulation port of the DP-BPSK modulator to form two closed photoelectric oscillator loops.
To establish a stable active mode locking mechanism, the signals generated by the dual port signal generator (3) need to satisfy:
V A (t)＝V+V 0 ·cos(2πN 1 f 0 t)
V B (t)＝V+V 0 ·cos(2πN 2 f 0 t)
wherein V is the direct current bias voltage of superposition of two radio frequency signals, V 0 Amplitude, N of sinusoidal signal 1 And N 2 Is a positive integer, f 0 Is the free spectral range of the optoelectronic oscillator. By varying the output frequency of the dual-port signal generator, i.e. controlling N 1 、N 2 Can respectively regulate the pulse repetition frequency of the output microwave pulse sequences a and b, wherein the pulse repetition frequency of the output microwave pulse sequences a and b is N 1 f 0 、N 2 f 0 。
As shown in fig. 2, the sinusoidal signal loaded at the bias port will modulate the gain of both loops, causing the gain in the loops to change as the amplitude of the injected signal changes, the signal will attenuate when the net gain is less than 1, and the signal will be amplified when the net gain is greater than 1. The time of one cycle of the signal in the loop is τ, which determines the free spectral range f of the optoelectronic oscillator 0 Because of the active mode locking mechanism, the signal will get the same net gain as last time through the DP-BPSK modulator again, and through many cycles, the pulse signal can be obtained when the net gain is greater than 1.
Example 1:
according to the structure shown in FIG. 1, the laser used in the experiment has a center wavelength of 1550nm, an output optical power of 14dBm, an operating bandwidth of 20GHz, a half-wave voltage of 8V, a single-mode fiber length of about 1km, bandwidths of the first and second photodetectors of 10GHz, a center frequency of the first microwave band-pass filter of 2.1GHz, a 3-dB bandwidth of 40MHz, a center frequency of the second microwave band-pass filter of 2.485GHz, a 3-dB bandwidth of 20MHz, and operating frequencies of the first and second microwave amplifiers of 1-38GHz. The DC bias voltage of the signal output by the dual-port radio frequency signal generator is 2V, the amplitude of the sinusoidal signal is 2.1V, and the frequency of the input signal is 163.5kHz, which is just equal to a free frequency spectrum range. Two microwave pulses in the fundamental frequency mode locking state are obtained, and a high-speed real-time oscilloscope and a broadband spectrometer are utilized to measure a time domain diagram and a spectrogram of two output microwave pulse signals, as shown in figures 3 and 4. The carrier frequency of the microwave pulse a is 2.1GHz, the pulse repetition rate is 163.5kHz, the carrier frequency of the microwave pulse b is 2.485GHz, and the pulse repetition rate is 163.5kHz.
Example 2:
the present embodiment differs from embodiment 1 in that:
the frequency of the input signal of the direct current bias port is adjusted to 327kHz and is exactly equal to twice of the free frequency spectrum range, so that second-order harmonic mode locking is realized, and other settings are the same as those of the embodiment 1. The pulse repetition frequency of the loop a and loop B output pulse sequences in this embodiment is thus twice that of embodiment 1. The time domain diagrams and the spectrograms of the two microwave pulse sequences output in the second-order harmonic mode locking state are shown in fig. 5 and 6. The carrier frequency of the microwave pulse a is 2.1GHz, the pulse repetition rate is 327kHz, the carrier frequency of the microwave pulse b is 2.485GHz, and the pulse repetition rate is 327kHz.
Example 3:
the present embodiment differs from embodiment 1 in that:
in this embodiment, one of the band-pass filters is replaced with a band-pass filter with an adjustable center frequency, the tunable range of the filter is 6GHz-12GHz, and other settings are the same as those in embodiment 1. The frequency of the output pulse carrier can be controlled by adjusting the position of the center frequency of the filter. As shown in fig. 7, the frequency spectrum of the signal was recorded at 1GHz intervals between 6GHz and 12 GHz.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the reference numerals in the figures are used more herein: including the terms laser 1, DP-BPSK modulator 2, dual-port signal generator 3, single-mode optical fiber 4, polarization controller 5, polarization beam splitter 6, first photodetector 7, second photodetector 8, first microwave amplifier 9, second microwave amplifier 10, first tunable microwave bandpass filter 11, second tunable microwave bandpass filter 12, first power divider 13, second power divider 14, etc., without excluding the possibility of using other terms. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.
Claims (4)
1. A dual-band microwave pulse generating device based on an active mode-locking photoelectric oscillator is characterized in that: the dual-port optical power divider comprises a laser (1), a DP-BPSK modulator (2), a dual-port signal generator (3), a single-mode optical fiber (4), a polarization controller (5), a polarization beam splitter (6), a first photoelectric detector (7), a second photoelectric detector (8), a first microwave amplifier (9), a second microwave amplifier (10), a first tunable microwave band-pass filter (11), a second tunable microwave band-pass filter (12), a first power divider (13) and a second power divider (14); the double-frequency-band microwave pulse generating device based on the active mode-locking photoelectric oscillator comprises A, B two feedback loops, and correspondingly outputs microwave pulses of two frequency bands; in the common part of two loops, the laser (1) outputs continuous light as carrier wave to the DP-BPSK modulator (2), two sine signals with direct current bias generated by the dual-port signal generator (3) are output to two bias ports of the DP-BPSK modulator (2), two radio frequency modulation ports of the DP-BPSK modulator (2) are respectively connected with the output ends of the first electric power divider (13) and the second electric power divider (14), the optical output port of the DP-BPSK modulator (2) outputs two modulated optical signals with mutually orthogonal polarization states through the single-mode optical fiber (4), the modulated optical signals are input to the polarization beam splitter (6) after being aligned by the polarization controller (5), the polarization beam splitter (6) divides the optical signals into two paths according to the polarization states, the optical signals entering the loop A are converted into electric signals through the first photoelectric detector (7), the electric signals output from the first photoelectric detector (7) are respectively amplified through the first electric power divider (13) and the second electric power divider (13) and the first optical feedback amplifier (13) and the second electric power divider (13) respectively, the microwave oscillator (13) are switched into the microwave oscillator (13) and the microwave oscillator (13), the other output port of the first electric power divider (13) outputs microwave pulse a of one frequency band; the optical signal entering the loop B is converted into an electric signal through the second photoelectric detector (8), the electric signal output by the second photoelectric detector (8) is respectively amplified by power and selected by a frequency band through the second microwave amplifier (10) and the second tunable microwave band-pass filter (12), and then is input into the second power divider (14), the output end of the second power divider (14) is fed back to the other radio frequency modulation port of the DP-BPSK modulator (2), so that the closed loop of the feedback loop of the active mode-locked photoelectric oscillator is completed, and the other output port of the second power divider (14) is output by the microwave pulse B of the other frequency band; the signal generated by the dual port signal generator (3) needs to satisfy:
wherein the method comprises the steps of
Direct current bias for superposition of two radio frequency signals,/I>
Amplitude of sinusoidal signal, ++>
And->
Is a positive integer>
Is the free spectral range of the optoelectronic oscillator; by varying the output frequency of the dual-port signal generator, i.e. controlling +.>
Respectively adjusting the pulse repetition frequency of the generated microwave pulses a and b, the pulse repetition frequency of the microwave pulses a and b being +.>
。
2. The dual-band microwave pulse generating device based on the active mode-locked photoelectric oscillator according to claim 1, wherein the DP-BPSK modulator (2) is an integrated modulator, and has two radio frequency modulation ports, two bias ports, and two electro-optical intensity modulators connected in parallel, and polarization states of two optical signals are orthogonal to each other.
3. The method for generating the double-frequency-band microwave pulse based on the active mode-locking photoelectric oscillator is characterized by comprising the following steps of:
step 1: the optical signals output by the laser (1) are divided into two paths of optical signals with mutually orthogonal polarization states in the DP-BPSK modulator (2), the two paths of optical signals are modulated by two electro-optical intensity modulators built in the DP-BPSK modulator (2) respectively, and the modulated optical signals are output after polarization beam combination;
step 2: the dual-port signal generator (3) is used for generating two sine signals with direct current bias, the bias port of the DP-BPSK modulator (2) is connected to the output end of the dual-port signal generator (3), and the radio frequency signal is connected to the bias port for modulating the gains of the two loops, so that active mode locking is realized;
step 3: the optical signals output by the DP-BPSK modulator (2) are transmitted through a section of single mode fiber (4), and are input to the polarization beam splitter (6) after being aligned by the polarization controller (5), the polarization beam splitter (6) divides the input optical signals into two paths according to the polarization states, and the polarization states of the two paths of output optical signals are mutually orthogonal;
step 4: the optical signal input into the loop A is converted into an electric signal through a first photoelectric detector (7), and then sequentially passes through a first microwave amplifier (9) and a first tunable microwave band-pass filter (11) to respectively realize power amplification and frequency band selection of the electric signal, and the output microwave signal is partially output through a first electric power divider (13) and fed back to a radio frequency modulation port of a DP-BPSK modulator (2) to form a complete photoelectric oscillation loop A; the optical signal input into the loop B is converted into an electric signal through a second photoelectric detector (8), and then sequentially passes through a second microwave amplifier (10) and a second tunable microwave band-pass filter (12) to respectively realize power amplification and frequency band selection of the electric signal, and the output electric signal is partially output and fed back to the DP-BPSK modulator (2) through a second electric power divider (14) to form a complete photoelectric oscillation loop B; the signal generated by the dual port signal generator (3) needs to satisfy:
wherein the method comprises the steps of
Direct current bias for superposition of two radio frequency signals,/I>
Amplitude of sinusoidal signal, ++>
And->
Is a positive integer>
Is the free spectral range of the optoelectronic oscillator; by varying the output frequency of the dual-port signal generator, i.e. controlling +.>
Respectively adjusting the pulse repetition frequency of the generated microwave pulses a and b, the pulse repetition frequency of the microwave pulses a and b being +.>
。
4. A dual-band microwave pulse generating method based on an active mode-locked optoelectronic oscillator according to claim 3, characterized in that the central frequencies of the first tunable microwave band-pass filter (11) and the second tunable microwave band-pass filter (12) are adjusted to control the carrier frequencies of the output microwave pulse a and the microwave pulse b, respectively.
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