CN114520692A - Soliton optoelectronic oscillator system - Google Patents

Abstract

The present disclosure provides a soliton optoelectronic oscillator system, comprising: the system comprises a laser light source, a phase modulator, a dual-passband notch filter, an optical signal delayer, an optical detector, an amplifier and a passive power divider; the laser light source, the phase modulator, the dual-passband notch filter and the optical detector form a dual-passband microwave photonic filter which is used for selecting a pair of mutually coupled modes in the soliton optoelectronic oscillator system to start oscillation. The system realizes the soliton photoelectric oscillator system under the combined action of nonlinear and linear effects, and when nonlinear gain saturation and linear filtering effects reach balance, soliton sequences with adjustable repetition periods and pulse widths can be obtained.

Description

A soliton photoelectric oscillator system

technical field

The present disclosure relates to the field of microwave photonics, in particular to a soliton photoelectric oscillator system.

Background technique

The soliton phenomenon refers to a physical phenomenon in which a wave packet or pulse maintains its shape due to a combination of nonlinear and linear effects. This phenomenon was first observed in water flow, and was subsequently used to describe solitons in optical systems, that is, the phenomenon that the optical field maintains its shape unchanged due to the combined effect of nonlinear and dispersion effects. In particular, dissipative optical solitons generated in nonlinear optical resonators have been widely studied in recent years. The core of the formation of dissipative optical solitons is nonlinear and dispersion effects in nonlinear optical resonators, as well as the effects of gain and loss. Double balance. Ultrashort pulses and broadband optical frequency combs can be generated based on dissipative optical solitons, which are widely used in optical metrology and spectroscopy, optical caching, photonic signal generation, and optical communications. On the other hand, microwave photonics is an interdisciplinary subject of optics and microwave technology. Microwave photonics technology uses optical means to generate, process, distribute and manipulate microwave signals, which are widely used in national defense, communication networks, imaging and modern instruments.

Similar to the position of nonlinear optical resonators in optics, optoelectronic oscillators are typical nonlinear optoelectronic resonators in microwave photonics, which are used to generate microwave signals. Single-frequency microwave signal generation, broadband chaotic microwave signal generation and chirped microwave signal generation based on photoelectric oscillators have been widely reported. As a nonlinear optoelectronic hybrid resonator, optoelectronic oscillators inherit the advantages of both optical and microwave technologies, such as ultra-wideband, tunable, and high precision. However, whether there is a soliton phenomenon in the photoelectric oscillator and how the soliton phenomenon affects the output of the photoelectric oscillator has not been recorded in the prior art so far.

SUMMARY OF THE INVENTION

In order to solve the above problems in the prior art, the present disclosure provides a soliton photoelectric oscillator system. The soliton photoelectric oscillator system realizes the soliton photoelectric oscillator system under the combined action of nonlinear and linear effects. When the nonlinear gain is saturated and the When the linear filtering effect reaches a balance, a soliton sequence with adjustable repetition period and pulse width can be obtained.

The present disclosure provides a soliton photoelectric oscillator system, comprising: a laser light source for generating an optical carrier; a phase modulator for modulating the optical carrier to obtain two double-order microwave modulation optical sidebands; a double passband The notch filter is used to suppress the two double-order microwave modulation optical sidebands to obtain two single-order microwave modulation signals; the optical signal delay device is used to delay the two single-order microwave modulation optical sidebands. time processing; photodetector, which is used to restore the two single-order microwave modulated optical sidebands after the delay to obtain two microwave signals; among them, the laser light source, the phase modulator, the double passband notch The filter and the photodetector constitute a double-pass band microwave photonic filter; the amplifier is used to amplify the power of two microwave signals; the passive power divider is used to distribute the power of the two microwave signals after power amplification, and obtain two A group of microwave signals, wherein each group of microwave signals includes two microwave signals whose power is halved, and the passive power divider inputs one group of microwave signals to the phase modulator, so that the group of microwave signals is cycled in the next cycle , and output another group of microwave signals, the product of the envelopes of the two microwave signals of the output is a soliton sequence.

Further, the soliton sequence z(t)=x ₁ (t)x ₂ (t) satisfies the following relationship:

Among them, x ₁ (t) and x ₂ (t) are the envelope amplitudes of the two microwave signals respectively, t is the current time, T is the ring cavity delay of the system, and β′ is the linearity independent of the amplitude of the soliton sequence. Gain coefficient, β″|z(tT)| is the nonlinear gain saturation effect coefficient related to the amplitude of the soliton sequence, τ represents the linear filtering effect of the double-passband microwave photonic filter, when the nonlinear gain saturation effect related to the amplitude of the soliton sequence The pulse width of this soliton sequence remains unchanged when balanced with the linear filtering effect of the dual-pass-band microwave photonic filter.

Further, the system is a single-loop or dual-loop or multi-loop, wherein the number of optical signal delayers and photodetectors in a single loop is one, and they are connected one-to-one; the optical signal delay in the double loop is The number of the optical signal delay device and the optical detector is two, and they are connected in one-to-one correspondence; the number of optical signal delayers and optical detectors in the multi-loop is multiple, and they are connected in one-to-one correspondence.

Further, the double-pass band notch filter is an optical filter having at least two notch responses, and is used for suppressing the first-order microwave-modulated light sideband of the two double-order microwave-modulated light sidebands.

Further, the optical signal delay device is composed of a long optical fiber, the length of the long optical fiber is 1m-20km, and the optical loss is 0.2dB/km.

Further, the positions of the amplifier and the passive power divider are interchanged.

Further, the bandwidth of the phase modulator is 0-100 GHz.

Further, the bandwidth of the photodetector is 0-150 GHz, and the responsivity is 1 A/W.

Further, the gain of the amplifier is 1dB˜60dB.

Further, the working bandwidth of the passive power divider is greater than or equal to 40 GHz.

Compared with the prior art, the present disclosure has the following beneficial effects:

(1) The soliton optoelectronic oscillator system provided by the present disclosure realizes the soliton optoelectronic oscillator system under the combined effect of nonlinear and linear effects. When the nonlinear gain saturation and the linear filtering effect reach a balance, the repetition period and pulse width can be obtained. tuned soliton sequence.

(2) The soliton phenomenon in the soliton photoelectric oscillator system provided by the present disclosure can generate a microwave signal with fast frequency hopping, and the frequency, frequency hopping speed and frequency hopping period of the frequency hopping microwave signal can be respectively controlled by the double passband microwave photonic filter. The center frequency, bandwidth and ring cavity delay of the optoelectronic oscillator can be adjusted.

Description of drawings

For a more complete understanding of the present disclosure and its advantages, reference will now be made to the following description taken in conjunction with the accompanying drawings, in which:

FIG. 1 schematically shows a structural diagram of a soliton photoelectric oscillator system according to an embodiment of the present disclosure.

FIG. 2 schematically shows a comparison diagram of the center frequency of the dual-passband microwave photonic filter and the center frequency difference between the optical carrier and the dual-passband notch filter 3 according to an embodiment of the present disclosure.

FIG. 3 schematically shows a double balance diagram of nonlinear gain saturation effect and linear filtering effect, and gain and loss in the soliton phenomenon according to an embodiment of the present disclosure.

FIG. 4 schematically shows a test result graph of the frequency response of the dual-passband microwave photonic filter according to an embodiment of the present disclosure.

FIG. 5 schematically shows a comparison diagram of a soliton sequence obtained according to an embodiment of the present disclosure and a corresponding simulation result.

FIG. 6 schematically shows a schematic diagram of an instantaneous frequency of a frequency-hopping microwave signal generated based on a soliton according to an embodiment of the present disclosure.

FIG. 7 schematically shows a double-loop schematic diagram of a frequency-hopping microwave signal based on soliton generation according to an embodiment of the present disclosure.

FIG. 8 schematically shows a structural diagram of a soliton photoelectric oscillator system according to another embodiment of the present disclosure.

Detailed ways

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood, however, that these descriptions are exemplary only, and are not intended to limit the scope of the present disclosure. In the following detailed description, for convenience of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It will be apparent, however, that one or more embodiments may be practiced without these specific details. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present disclosure.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present disclosure. The terms "comprising", "comprising" and the like as used herein indicate the presence of stated features, steps, operations and/or components, but do not preclude the presence or addition of one or more other features, steps, operations or components.

All terms (including technical and scientific terms) used herein have the meaning as commonly understood by one of ordinary skill in the art, unless otherwise defined. It should be noted that terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly rigid manner.

FIG. 1 schematically shows a structural diagram of a soliton photoelectric oscillator system according to an embodiment of the present disclosure.

As shown in FIG. 1 , the present disclosure provides a soliton optoelectronic oscillator system, which includes:

The laser light source 1 is used to generate an optical carrier with a frequency fc.

The phase modulator 2 is used for modulating the optical carrier to obtain two double-order microwave modulation optical sidebands.

In this embodiment, the first input end of the phase modulator 2 is connected to the output end of the laser light source 1 through a fiber jumper, which is used to modulate the two frequency-hopping microwave signals from the system link and load them into the optical carrier , two double-order microwave modulated optical sidebands are obtained, wherein the frequencies of the two frequency-hopping microwave signals are f ₁ and f ₂ respectively. Wherein, the bandwidth of the phase modulator 2 is 0-100 GHz, which can modulate and load the microwave signal with a frequency of 0-100 GHz onto the optical carrier.

The double-pass band notch filter 3 is used for suppressing two double-order microwave modulation optical sidebands to obtain two single-order microwave modulation signals.

In this embodiment, the input end of the double passband notch filter 3 is connected to the output end of the phase modulator 2 through an optical fiber jumper, which is an optical filter with at least two notch responses, used to suppress two dual One of the first-order microwave modulation optical sidebands is obtained, and two single-order microwave modulation signals are obtained, and the frequencies of the two single-order microwave modulation optical sidebands are f′ ₁ and f ₂ ′ respectively, Wherein, the notch frequencies of the double passband notch filter 3 are f _c -f ₁ and f _c +f ₂ , and f' ₁ =f _c +f ₁ , f ₂ '=f _c -f ₂ .

The optical signal delay device 4 is used to perform delay processing on the two single-order microwave modulation optical sidebands.

In this embodiment, the input end of the optical signal delay device 4 is connected with the output end of the double-pass band notch filter 3 through an optical fiber jumper, and the optical signal delay device 4 is composed of a long optical fiber, and the length of the long optical fiber is 1 m ～20km, the optical loss is 0.2dB/km, which can realize the delay of 5ps～100μs for the optical carrier and two single-order microwave modulation optical sidebands.

The photodetector 5 is used for processing the delayed two single-order microwave modulated optical sidebands through beat frequency restoration to obtain two microwave signals.

In this embodiment, the input end of the photodetector 5 is connected to the output end of the optical signal delayer 4 through an optical fiber jumper, the bandwidth of the photodetector 5 is 0-150GHz, and the responsivity is 1A/W, which restores the optical signal. A microwave signal with a frequency of 0 to 150 GHz is obtained.

The amplifier 6 is used for power amplifying the two microwave signals.

In this embodiment, the input end of the amplifier 6 is connected to the output end of the photodetector 5 through a cable, and its amplification gain is 1dB-60dB, which can realize 1.12-1,000,000 times amplification of the power of the two microwave signals.

The passive power divider 7 is used to divide the power of the two microwave signals after power amplification to obtain two sets of microwave signals, wherein each set of microwave signals includes two microwave signals whose power is halved, and the passive power divider The device 7 inputs one group of microwave signals to the phase modulator 2, so that the group of microwave signals performs the next cycle, and outputs the other group of microwave signals. The product of the envelopes of the two output microwave signals is Soliton sequence.

In this embodiment, the input end of the passive power divider 7 is connected to the output end of the amplifier 6 through a cable, the first output end of the passive power divider 7 is connected to the second input end of the phase modulator 2 through a cable, and the second output end is a microwave signal At the output end, the passive power divider 7 is used for power distribution of the two microwave signals. Wherein, the working bandwidth of the passive power divider 7 is greater than or equal to 40 GHz, and it performs power distribution for microwave signals in the frequency range of 40 GHz or higher.

In this embodiment, the laser light source 1, the phase modulator 2, the double-pass band notch filter 3 and the photodetector 5 together form a double-pass band microwave photonic filter, which is used to select a pair of mutually coupled photoelectric oscillators. The mode starts to oscillate, and the mutually coupled mode is affected by the nonlinear gain saturation effect related to the amplitude of the soliton sequence and the linear filtering effect of the double-pass band microwave photonic filter. The nonlinear gain saturation effect and the linear filtering effect under steady-state oscillation Balance, gain and loss are also balanced against each other, and the system produces soliton sequences and frequency hopping microwave signals. Among them, the center frequency of the double-pass band microwave photonic filter is configured to be equal to the difference between the optical carrier of the laser light source 1 and the center frequency of the double-pass band notch filter 3. The notch frequency with notch filter 3 is adjusted.

The working principle of the soliton photoelectric oscillator system provided in this embodiment is as follows: after the optical carrier emitted by the laser light source 1 is modulated by the phase modulator 2, two double-order microwave modulation optical sidebands are obtained. The modulated light sideband passes through the double passband notch filter 3, and the double passband notch filter 3 filters out the first-order microwave modulated light sideband of the two double-order microwave modulated light sidebands, and obtains two single-order microwave modulated light sidebands. The microwave modulation signal, after converting its phase modulation into intensity modulation, can be obtained in the photodetector 5 corresponding to the difference between the optical carrier frequency emitted by the laser light source 1 and the frequency corresponding to the notch position of the double-pass band notch filter 3. microwave signal. It can be seen that the laser light source 1, the phase modulator 2, the double passband notch filter 4 and the photodetector 5 together form a double passband microwave photonic filter, and the passband of the double passband microwave photonic filter is determined by the laser light source. It is determined by the difference between the frequencies corresponding to the positions of notch 1 and notch 3 of the double passband notch filter. A pair of modes selected by the double-passband microwave photonic filter 3 are coupled to each other. When the nonlinear gain saturation effect related to the amplitude of the soliton sequence is balanced with the linear filtering effect of the double-passband microwave photonic filter, the gain and loss are also When the equilibrium is reached, the soliton sequence with adjustable repetition period and pulse width and the frequency-hopping microwave signal with adjustable broadband can be obtained.

Among them, the optical carrier emitted by the laser light source 1 enters the phase modulator 2 and undergoes phase modulation. After modulation, the optical carrier and two double-order microwave modulation optical sidebands are included. The beat frequency signals of the microwave modulated optical sidebands cancel each other, so they cannot be restored to microwave signals in the photodetector 5 . When the two double-order microwave-modulated optical sidebands fall into the double-passband notch filter 3, their corresponding sidebands are suppressed, and the optical carrier and the unsuppressed microwave-modulated optical sidebands beat in the photodetector 5 The microwave signal of the corresponding frequency can be restored, which constitutes an equivalent double-pass-band microwave photonic filter, and its transmission response is a band-pass shape, as shown in Figure 2. The center frequency of the double-pass-band microwave photonic filter is equal to the difference between the optical carrier generated by the laser light source 1 and the center frequency of the double-pass-band notch filter 3, and the soliton optoelectronic oscillator system can be selected through the double-pass band microwave photonic filter. A pair of mutually coupled modes start to oscillate. At this time, the delay differential equation of the soliton photoelectric oscillator system can be expressed as:

where x(t)=x ₁ (t)+x ₂ (t), x ₁ (t) and x ₂ (t) are the envelope amplitudes of the two microwave signals respectively, τ=1/(πΔf) , Δf is the 3dB bandwidth of the dual-pass-band microwave photonic filter, G _L =G _A R _PD I _PD Z _PD and G _NL =2J ₁ (π/V _π ·|x(tT)|)/|x(tT) | are the linear gain independent of the amplitude of the soliton sequence and the nonlinear gain saturation effect coefficient related to the amplitude of the soliton sequence, GA is the gain of the amplifier 6, R _PD , I _PD and Z _PD are the responsivity, Input power and impedance, J _n is the n-th order Bessel function of the first kind, V _π is the half-wave of the phase modulator 2, T is the ring cavity delay of the soliton photoelectric oscillator system, t is the current time, according to the formula 1. The coupling equation of a pair of modes can be deduced as

在稳态振荡的条件下，即该孤子光电振荡器系统的增益和损耗互相平衡且信号在环腔内自再现时，这对互相耦合的模式得到的该两个微波信号的包络线幅度乘积z(t)＝x₁(t)x₂(t)满足：in,

Under the condition of steady-state oscillation, that is, when the gain and loss of the soliton optoelectronic oscillator system balance each other and the signal is self-reproducing in the ring cavity, the product of the envelope amplitudes of the two microwave signals obtained by the pair of mutually coupled modes z(t)=x ₁ (t)x ₂ (t) satisfies:

Among them, β′=(3-β)/2, β″=3β/8, it can be seen from formula 3 that the gain of z(t) β′+β″|Z(t-T)| and the magnitude of its absolute value Relatedly, the larger |z(t-T)|, the larger the gain obtained by z(t), which is a nonlinear gain saturation effect related to the amplitude of the soliton sequence. When z(t) is in pulse shape, the nonlinear gain saturation effect compresses the pulse width of z(t). At the same time, the dual-passband microwave photonic filter is also filtering the signal linearly in the frequency domain, thus stretching the pulse width of z(t). As shown in Fig. 3, under steady-state conditions, the shape and pulse width of z(t) are maintained when the nonlinear gain saturation effect related to the amplitude of this soliton sequence is balanced with the linear filtering effect of the dual-passband microwave photonic filter. Invariant, so z(t) in this state is a soliton sequence. Under the action of the soliton sequence, the pair of mutually coupled modes will continuously undergo frequency hopping, and the soliton photoelectric oscillator system can generate frequency-hopping microwave signals.

Among them, it can be seen from Equation 3 that the repetition period and soliton pulse width of the soliton obtained by the soliton photoelectric oscillator system can be tuned, the repetition period can be adjusted by controlling the ring cavity delay of the photoelectric oscillator, and the soliton pulse width can be adjusted by controlling the double Bandwidth tuning of passband microwave photonic filters. At the same time, the frequency, frequency hopping speed and frequency hopping period of the frequency hopping microwave signal generated based on the soliton phenomenon can also be adjusted. By controlling the center frequency and bandwidth of the double-pass band microwave photonic filter, the frequency and frequency hopping of the frequency hopping microwave signal can be realized. The speed adjustment, or the adjustment of the frequency hopping period of the frequency hopping microwave signal can be realized by controlling the ring cavity delay of the soliton photoelectric oscillator system.

FIG. 4 schematically shows a test result diagram of the frequency response of a dual-pass-band microwave photonic filter according to an embodiment of the present disclosure. As can be seen from FIG. 4 , the frequency response of the dual-pass-band microwave photonic filter includes f ₁ and f ₂ two passbands, so a pair of mutually coupled modes in the opto-oscillator can be selected to oscillate.

FIG. 5 schematically shows a comparison diagram of a soliton sequence obtained according to an embodiment of the present disclosure and a corresponding simulation result. It can be seen from FIG. 5 that the soliton photoelectric oscillator system provided by this example obtains a pulse width of the order of tens of ns. The soliton sequence, the repetition period of the soliton sequence is equal to the ring cavity delay of the soliton photoelectric oscillator system.

FIG. 6 schematically shows a schematic diagram of the instantaneous frequency of a frequency-hopping microwave signal generated based on a soliton according to an embodiment of the present disclosure. It can be seen from FIG. 6 that the frequency of the frequency-hopping microwave signal generated by the soliton photoelectric oscillator is a double-passband microwave photon. The filter selects f ₁ and f ₂ , the pair of frequencies jumps rapidly with the cycle of the ring cavity delay of the soliton optoelectronic oscillator system. Therefore, by adopting the above technical solution in this embodiment, a soliton sequence and a frequency hopping microwave signal can be obtained.

In some embodiments of the present disclosure, the positions of the amplifier 6 and the passive power divider 7 are interchanged, which can also achieve the technical effects in the above-mentioned embodiments.

In some embodiments of the present disclosure, the soliton photoelectric oscillator system is a single-loop or double-loop or multi-loop, wherein the number of the optical signal delayer 4 and the photodetector 5 in the single loop is one, and one of the One corresponding connection; the number of optical signal delayers 4 and photodetectors 5 in double loops is two, and they are connected in one-to-one correspondence, as shown in Figure 7; the optical signal delayers 4 and photodetectors in multi-loop The number of 5 is multiple, and they are connected one by one, wherein, when the system is a dual-loop or multi-loop, due to the vernier caliper effect, the mode interval of the system is jointly determined by the length of each loop of the dual-loop or multi-loop , so the mode interval is larger than that when the system is a single loop, and it is easier to select single or multiple modes of microwave signal oscillation.

FIG. 8 schematically shows a structural diagram of a soliton photoelectric oscillator system according to another embodiment of the present disclosure.

As shown in FIG. 8 , in this embodiment, the soliton photoelectric oscillator system includes: a laser light source 1 , an intensity modulator 2 ′, an optical signal delay device 4 , a photodetector 5 , a double-pass band filter 3 ′, and an amplifier 6 and a passive power divider 7, wherein the laser light source 1, the intensity modulator 2', the optical signal delayer 4 and the photodetector 5 are connected by fiber jumpers, the photodetector 5, the double-pass band filter 3 ', the amplifier 6, the passive power divider 7 and the intensity modulator 2' are connected by cables.

In this embodiment, the double-pass band electric filter 3' directly realizes the function of the double-pass band microwave photonic filter. At this time, it only needs to cooperate with the intensity modulator 2' to select a pair of mutual coupling in the soliton photoelectric oscillator system. The soliton optoelectronic oscillator system can generate soliton sequence and frequency hopping microwave signal by starting the oscillation in the stable oscillation mode, realizing nonlinear gain saturation, linear filtering effect, and double balance of gain and loss under steady-state oscillation.

In addition, the system structure provided in the above embodiments does not constitute a limitation on the device, the number, shape and size of the devices in the device can be modified according to the actual situation, and the configuration of the devices may be more complicated.

Those skilled in the art will appreciate that various combinations and/or combinations of features recited in various embodiments and/or claims of the present disclosure are possible, even if such combinations or combinations are not expressly recited in the present disclosure. In particular, various combinations and/or combinations of the features recited in the various embodiments of the present disclosure and/or in the claims may be made without departing from the spirit and teachings of the present disclosure. All such combinations and/or combinations fall within the scope of this disclosure.

Although the present disclosure has been shown and described with reference to specific exemplary embodiments of the present disclosure, those skilled in the art will appreciate that, without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents, Various changes in form and detail have been made in the present disclosure. Therefore, the scope of the present disclosure should not be limited to the above-described embodiments, but should be determined not only by the appended claims, but also by their equivalents.

Claims (10)

1. a soliton photoelectric oscillator system, is characterized in that, comprises: a laser light source (1) for generating an optical carrier; a phase modulator (2) for modulating the optical carrier to obtain two double-order microwave modulation optical sidebands; A double-pass-band notch filter (3) is used to suppress the two double-order microwave modulation optical sidebands to obtain two single-order microwave modulation signals; an optical signal delayer (4), configured to perform delay processing on the two single-order microwave modulated optical sidebands; A photodetector (5), configured to process the two single-order microwave modulated optical sidebands after a beat frequency reduction to obtain two microwave signals; wherein, the laser light source (1), the phase modulation The device (2), the double passband notch filter (3) and the photodetector (5) constitute a double passband microwave photonic filter; an amplifier (6) for power amplifying the two microwave signals; A passive power divider (7), configured to perform power distribution on the two microwave signals after power amplification, to obtain two sets of microwave signals, wherein each set of microwave signals includes the two microwave signals with the power halved The passive power divider (7) inputs one group of microwave signals to the phase modulator (2), so that the group of microwave signals performs the next cycle, and outputs the other group of microwave signals, The product of the envelopes of the output two microwave signals is a soliton sequence. 2. The soliton photoelectric oscillator system according to claim 1, wherein the soliton sequence z(t)=x ₁ (t)x ₂ (t) satisfies the following relationship:

Wherein, x ₁ (t) and x ₂ (t) are the envelope amplitudes of the two microwave signals respectively, t is the current time, T is the ring cavity delay of the system, and β′ is the soliton sequence with the Amplitude-independent linear gain coefficient, β″|z(tT)| is the nonlinear gain saturation effect coefficient related to the amplitude of the soliton sequence, τ represents the linear filtering effect of the double-pass band microwave photonic filter, when the soliton sequence When the amplitude-dependent nonlinear gain saturation effect is balanced with the linear filtering effect of the dual-pass-band microwave photonic filter, the pulse width of the soliton sequence remains unchanged. 3. The soliton optoelectronic oscillator system according to claim 1 or 2, wherein the system is a single loop or a double loop or a multi loop, wherein the optical signal in the single loop is delayed The number of the device (4) and the photodetector (5) is one, and they are connected in one-to-one correspondence; the number of the optical signal delay device (4) and the photodetector (5) in the double loop There are two, which are connected in one-to-one correspondence; the number of the optical signal delayers (4) and the optical detectors (5) in the multi-loop is multiple, and they are connected in one-to-one correspondence. 4. The soliton optoelectronic oscillator system according to claim 1, wherein the double-pass band notch filter (3) is an optical filter with at least two notch responses, for suppressing the two The first-order microwave-modulated optical sideband of the two-order microwave-modulated optical sidebands. 5 . The soliton photoelectric oscillator system according to claim 1 , wherein the optical signal delay device ( 4 ) is composed of a long optical fiber, the length of the long optical fiber is 1m-20km, and the optical loss is 0.2dB/km. 6 . 6. The soliton photoelectric oscillator system according to claim 1, characterized in that, the positions of the amplifier (6) and the passive power divider (7) are interchanged. 7 . The soliton photoelectric oscillator system according to claim 1 , wherein the bandwidth of the phase modulator ( 2 ) is 0-100 GHz. 8 . 8 . The soliton photoelectric oscillator system according to claim 1 , wherein the bandwidth of the photodetector ( 5 ) is 0-150 GHz, and the responsivity is 1 A/W. 9 . 9 . The soliton photoelectric oscillator system according to claim 1 , wherein the gain of the amplifier ( 6 ) is 1 dB˜60 dB. 10 . 10 . The soliton photoelectric oscillator system according to claim 1 , wherein the working bandwidth of the passive power divider ( 7 ) is greater than or equal to 40 GHz. 11 .

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