阅读说明：本技术 一种稳频光电振荡器 (Frequency-stabilized photoelectric oscillator ) 是由 李明 李国政 郝腾飞 石暖暖 李伟 于 2021-09-13 设计创作，主要内容包括：本公开提供一种稳频光电振荡器,涉及微波光子技术领域,包括：光源单元,用于发出单频光信号并将所述单频光信号等分为两路；光电振荡器,用于将接收的一路单频光信号转换为扫频电信号,并将所述扫频电信号分成两路,一路作为输出信号输出,另一路形成闭合环路；稳频控制器,用于对另一路所述单频光信号的波长进行实时监测并反馈调节所述光源单元所发出的单频光信号,从而实现所述光电振荡器输出的扫频电信号的频率稳定。(The utility model provides a frequency stabilization optoelectronic oscillator relates to microwave photon technical field, includes: the light source unit is used for emitting a single-frequency optical signal and equally dividing the single-frequency optical signal into two paths; the photoelectric oscillator is used for converting a single-frequency received optical signal into a frequency sweeping electric signal and dividing the frequency sweeping electric signal into two paths, wherein one path is used as an output signal to be output, and the other path forms a closed loop; and the frequency stabilization controller is used for monitoring the wavelength of the other single-frequency optical signal in real time and feeding back and adjusting the single-frequency optical signal emitted by the light source unit, so that the frequency stabilization of the frequency-sweeping electric signal output by the photoelectric oscillator is realized.)

1. A frequency stabilized optoelectronic oscillator comprising:

the light source unit is used for emitting a single-frequency optical signal and equally dividing the single-frequency optical signal into two paths;

the photoelectric oscillator is used for converting a single-frequency received optical signal into a frequency sweeping electric signal and dividing the frequency sweeping electric signal into two paths, wherein one path is used as an output signal to be output, and the other path forms a closed loop;

and the frequency stabilization controller is used for monitoring the wavelength of the other single-frequency optical signal in real time and feeding back and adjusting the single-frequency optical signal emitted by the light source unit, so that the frequency stabilization of the frequency-sweeping electric signal output by the photoelectric oscillator is realized.

2. The frequency stabilized optoelectronic oscillator of claim 1, wherein the light source unit comprises:

a semiconductor laser for generating a single frequency optical signal;

and the optical coupler is connected with the semiconductor laser and is used for dividing the single-frequency optical signal generated by the semiconductor laser into two paths with equal power.

3. The frequency stabilized optoelectronic oscillator of claim 1, wherein the optoelectronic oscillator comprises:

the device comprises a light source processing unit, a phase modulator, a polarization controller, a notch filter, a long optical fiber, a first photoelectric detector, an electric coupler and an electric amplifier;

the light source processing unit, the phase modulator, the polarization controller, the notch filter, the long optical fiber and the photoelectric detector are sequentially connected through optical fibers; the photoelectric detector, the electric coupler, the electric amplifier and the phase modulator are sequentially connected through cables.

4. The frequency stabilized optoelectronic oscillator of claim 3, wherein the notch filter is one of a phase shifted fiber Bragg grating, a micro-ring, and a gas absorption cell.

5. A frequency stabilized optoelectronic oscillator according to claim 3, wherein said electrical coupler splits the electrical swept frequency signal into two paths, which are respectively transmitted to said electrical amplifier and output as an output signal.

6. The frequency stabilized optoelectronic oscillator of claim 3, wherein the light source processing unit comprises:

an intensity modulator, a radio frequency source, an optical filter, an optical amplifier;

the intensity modulator, the optical filter and the optical amplifier are connected in sequence through optical fibers; the radio frequency source is connected with the intensity modulator through a cable; the radio frequency source can generate sweep frequency microwave signals, and the intensity modulator can modulate the single-frequency optical signals through the sweep frequency microwave signals to obtain a photoelectric oscillator light source; the phase modulator is used for receiving the photoelectric oscillator light source.

7. The frequency stabilized optoelectronic oscillator of claim 6, wherein the frequency stabilization controller comprises:

a digital controller, a current drive circuit;

the first optical coupler and the digital controller are connected in sequence through optical fibers; the digital controller is connected with the current driving circuit through a cable; the first optical coupler is used for dividing the single-frequency optical signal into two paths and respectively sending the two paths of signals to the intensity modulator and the digital controller, and the digital controller forms a digital control signal according to the received single-frequency optical signal; the digital control signal is used for controlling the current driving circuit, and then the semiconductor laser is controlled by the current driving circuit to emit the single-frequency optical signals with different wavelengths.

8. The frequency stabilized optoelectronic oscillator of claim 6, wherein the number of the optical amplifiers is single or plural.

9. The frequency stabilized optoelectronic oscillator of claim 7, wherein the digital controller comprises:

the gas absorption cell is connected with the first photoelectric detector, the second photoelectric detector is connected with the second photoelectric detector, the third photoelectric detector is connected with the first analog-to-digital converter, and the second analog-to-digital converter is connected with the second analog-to-digital converter;

the second optical coupler is connected with the second photoelectric detector through an optical fiber, and the second photoelectric detector, the first analog-to-digital converter and the digital signal processor are sequentially connected through a cable; the second optical coupler, the gas absorption cell and the third photoelectric detector are connected through optical fibers, and the third photoelectric detector, the second analog-to-digital converter and the digital signal processor are sequentially connected through cables; the second optical coupler is connected with the first optical coupler through an optical fiber, and the digital signal processor is connected with the current driving circuit through a cable.

10. The frequency stabilized optoelectronic oscillator of claim 7, wherein the digital signal processor is a single chip.

Technical Field

The disclosure relates to the technical field of microwave photons, in particular to a frequency stabilization photoelectric oscillator.

Background

The electric signals generated by utilizing a microwave photonics method are always concerned, and the electric signals generated by the traditional electric method often have the problems of poor phase noise and the like. With the development of microwave photon technology, the generation of electrical signals by using a photoelectric oscillator is widely studied, however, the generation of electrical signals by using a photoelectric oscillator has the disadvantage of unstable frequency, and the laser is affected by the environment such as temperature and the like to generate frequency drift, which further affects the frequency stability of the generated electrical signals.

Disclosure of Invention

Technical problem to be solved

Based on the above problem, the present disclosure provides a frequency-stabilized optoelectronic oscillator to alleviate the technical problem that the optoelectronic oscillator in the prior art is prone to frequency drift, thereby resulting in poor frequency stability of the generated electrical signal.

(II) technical scheme

The present disclosure provides a frequency-stabilized optoelectronic oscillator, comprising:

the light source unit is used for emitting a single-frequency optical signal and equally dividing the single-frequency optical signal into two paths;

the photoelectric oscillator is used for converting a single-frequency received optical signal into a frequency sweeping electric signal and dividing the frequency sweeping electric signal into two paths, wherein one path is used as an output signal to be output, and the other path forms a closed loop;

and the frequency stabilization controller is used for monitoring the wavelength of the other single-frequency optical signal in real time and feeding back and adjusting the single-frequency optical signal emitted by the light source unit, so that the frequency stabilization of the frequency-sweeping electric signal output by the photoelectric oscillator is realized.

In an embodiment of the present disclosure, the light source unit includes:

a semiconductor laser for generating a single frequency optical signal;

and the optical coupler is connected with the semiconductor laser and is used for dividing the single-frequency optical signal generated by the semiconductor laser into two paths with equal power.

In an embodiment of the present disclosure, the optoelectronic oscillator includes:

the device comprises a light source processing unit, a phase modulator, a polarization controller, a notch filter, a long optical fiber, a first photoelectric detector, an electric coupler and an electric amplifier;

the light source processing unit, the phase modulator, the polarization controller, the notch filter, the long optical fiber and the photoelectric detector are sequentially connected through optical fibers; the photoelectric detector, the electric coupler, the electric amplifier and the phase modulator are sequentially connected through cables.

In the embodiment of the present disclosure, the notch filter is one of a phase-shift fiber bragg grating, a micro-ring, and a gas absorption cell.

In the embodiment of the present disclosure, the electric coupler divides the electrical frequency sweeping signal into two paths, and respectively transmits the two paths to the electric amplifier and outputs the two paths as output signals.

In an embodiment of the present disclosure, the light source processing unit includes:

an intensity modulator, a radio frequency source, an optical filter, an optical amplifier;

the intensity modulator, the optical filter and the optical amplifier are connected in sequence through optical fibers; the radio frequency source is connected with the intensity modulator through a cable; the radio frequency source can generate sweep frequency microwave signals, and the intensity modulator can modulate the single-frequency optical signals through the sweep frequency microwave signals to obtain a photoelectric oscillator light source; the phase modulator is used for receiving the photoelectric oscillator light source.

In an embodiment of the present disclosure, the frequency stabilization controller includes:

a digital controller, a current drive circuit;

the first optical coupler and the digital controller are connected in sequence through optical fibers; the digital controller is connected with the current driving circuit through a cable; the first optical coupler is used for dividing the single-frequency optical signal into two paths and respectively sending the two paths of signals to the intensity modulator and the digital controller, and the digital controller forms a digital control signal according to the received single-frequency optical signal; the digital control signal is used for controlling the current driving circuit, and then the semiconductor laser is controlled by the current driving circuit to emit the single-frequency optical signals with different wavelengths.

In the disclosed embodiment, the number of the optical amplifiers is single or multiple.

In an embodiment of the present disclosure, the digital controller includes:

the gas absorption cell is connected with the first photoelectric detector, the second photoelectric detector is connected with the second photoelectric detector, the third photoelectric detector is connected with the first analog-to-digital converter, and the second analog-to-digital converter is connected with the second analog-to-digital converter;

the second optical coupler is connected with the second photoelectric detector through an optical fiber, and the second photoelectric detector, the first analog-to-digital converter and the digital signal processor are connected through a cable; the second optical coupler, the gas absorption cell and the third photoelectric detector are connected through optical fibers, and the third photoelectric detector, the second analog-to-digital converter and the digital signal processor are connected through cables; the second optical coupler is connected with the first optical coupler through an optical fiber, and the digital signal processor is connected with the current driving circuit through a cable.

In the embodiment of the present disclosure, the digital signal processor is a single chip microcomputer.

(III) advantageous effects

According to the technical scheme, the frequency-stabilized photoelectric oscillator disclosed by the invention has at least one or part of the following beneficial effects:

(1) the wavelength of an optical signal is converted into power change, the power change is detected by a photoelectric detector in real time, and the real-time feedback control is realized by a digital signal processor; and

(2) the wavelength stability of the output optical signal of the laser can be ensured, and the frequency of the electric signal generated by the system is stabilized.

Drawings

Fig. 1 is a schematic structural diagram of a frequency-stabilized optoelectronic oscillator according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of components of a frequency-stabilized optoelectronic oscillator according to an embodiment of the present disclosure.

[ description of main reference numerals in the drawings ] of the embodiments of the present disclosure

01 light source unit

02 photoelectric oscillator

021 light source processing unit

03 frequency stabilization controller

031 digital controller

1 semiconductor laser

21 first optical coupler

22 second optical coupler

3 intensity modulator

4 radio frequency source

5 optical filter

6 optical amplifier

7 phase modulator

8 polarization controller

9 notch filter

10 long optical fiber

111 first photodetector

112 second photodetector

113 third photodetector

14 gas absorption cell

151 first analog-to-digital converter

152 second analog-to-digital converter

16 digital signal processor

17 current drive circuit

Detailed Description

The utility model provides a frequency stabilization optoelectronic oscillator, frequency stabilization optoelectronic oscillator is through converting the wavelength change of light signal into power change, is detected by photoelectric detector in real time, by the real-time feedback control of digital signal processor, guarantees the wavelength stability of the output light signal of laser instrument, and the produced signal of telecommunication frequency of system that comes from this to stabilize, can overcome current optoelectronic oscillator's main shortcoming and weak point.

For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

In an embodiment of the present disclosure, a frequency-stabilized optoelectronic oscillator is provided, as shown in fig. 1, the optoelectronic oscillator includes: the light source unit 01 is used for emitting a single-frequency light signal and equally dividing the single-frequency light signal into two paths; the photoelectric oscillator 02 is used for converting a single-frequency received optical signal into a frequency sweeping electrical signal, and dividing the frequency sweeping electrical signal into two paths, wherein one path is used as an output signal to be output, and the other path forms a closed loop; and the frequency stabilization controller 03 is configured to monitor the wavelength of another single-frequency optical signal in real time and perform feedback control on the single-frequency optical signal emitted by the light source unit 01, so as to achieve frequency stabilization of the frequency-sweep electrical signal output by the optoelectronic oscillator 02.

In the embodiment of the present disclosure, as shown in fig. 2, the light source unit 01 includes: a semiconductor laser 1 for generating a single-frequency optical signal; the first optical coupler 21 is connected to the semiconductor laser 1, and is configured to divide a single-frequency optical signal generated by the semiconductor laser 1 into two paths with equal power.

In the embodiment of the present disclosure, as shown in fig. 2, the optoelectronic oscillator 02 includes: a light source processing unit 021, a phase modulator 7, a polarization controller 8, a notch filter 9, a long optical fiber 10, a first photodetector 111, an electric coupler 12 and an electric amplifier 13; wherein, the light source processing unit 021, the phase modulator 7, the polarization controller 8, the notch filter 9, the long optical fiber 10 and the first photoelectric detector 111 are connected in sequence through optical fibers; the first photodetector 111, the electric coupler 12, the electric amplifier 13, and the phase modulator 7 are connected in this order by a cable.

In the embodiment of the present disclosure, as shown in fig. 2, the electric coupler 12 divides the electrical frequency sweeping signal into two paths, and respectively transmits the two paths to the electric amplifier 13 and outputs the two paths as output signals.

In the embodiment of the present disclosure, as shown in fig. 2, the frequency-stabilized optoelectronic oscillator light source is obtained by processing a single-frequency optical signal emitted by the semiconductor laser 1 by a light source processing unit 021, and the light source processing unit 021 includes: an intensity modulator 3, a radio frequency source 4, an optical filter 5, and an optical amplifier 6; the intensity modulator 3, the optical filter 5 and the optical amplifier 6 are connected in sequence through optical fibers; the radio frequency source 4 is connected with the intensity modulator 3 through a cable; the radio frequency source 3 can generate a frequency sweep microwave signal, and the intensity modulator 3 can modulate a single-frequency optical signal through the frequency sweep microwave signal to obtain a photoelectric oscillator light source; the phase modulator 7 is used to receive the opto-electronic oscillator light source.

In the embodiment of the present disclosure, as shown in fig. 2, the frequency stabilization controller 03 includes: digital controller, current drive circuit 17; wherein, the first optical coupler 21 and the digital controller 031 are connected in sequence by optical fibers; the digital controller 031 is connected with the current driving circuit 17 through a cable; the first optical coupler 21 is configured to divide the single-frequency optical signal into two paths, and respectively send the two paths to the intensity modulator 3 and the digital controller 031, where the digital controller 031 forms a digital control signal according to the received single-frequency optical signal; the digital control signal is used for controlling the current driving circuit 17, and then the current driving circuit 17 controls the semiconductor laser 1 to emit stable single-frequency optical signals with different wavelengths.

In the embodiment of the present disclosure, as shown in fig. 2, the digital controller 031 includes: the second optical coupler 22, the gas absorption cell 14, the second photodetector 112, the third photodetector 113, the first analog-to-digital converter 151, the second analog-to-digital converter 152 and the digital signal processor 16 are connected by cables; the second optical coupler 22 is connected to the second photodetector 112 through an optical fiber, and the second photodetector 112, the first analog-to-digital converter 151 and the digital signal processor 16 are connected to each other; the two optical couplers 22, the gas absorption cell 14 and the third photodetector 113 are connected through optical fibers, and the third photodetector 113, the second analog-to-digital converter 152 and the digital signal processor 16 are connected through cables; the second optical coupler 22 is connected to the first optical coupler 21 via an optical fiber, and the digital signal processor 16 is connected to the current drive circuit 17 via a cable.

Specifically, as shown in fig. 2, in the embodiment of the present disclosure, a frequency-stabilized optoelectronic oscillator includes a semiconductor laser 1, a first optical coupler 21, an intensity modulator 3, a radio frequency source 4, an optical filter 5, an optical amplifier 6, a phase modulator 7, a polarization controller 8, a notch filter 9, a long optical fiber 10, a first photodetector 111, an electric coupler 12, an electric amplifier 13, a first optical coupler 22, a gas absorption cell 14, a second photodetector 112, a second photodetector 113, a first analog-to-digital converter 151, a second analog-to-digital converter 152, a digital signal processor 16, and a current driving circuit 17;

the semiconductor laser 1, the first optical coupler 21, the intensity modulator 3, the optical filter 5, the optical amplifier 6, the phase modulator 7, the polarization controller 8, the notch filter 9, the long optical fiber 10 and the first photoelectric detector 111 are connected in sequence through optical fiber jumpers;

wherein the first photoelectric detector 111, the electric coupler 12, the electric amplifier 13 and the phase modulator 7 are connected in sequence through cables;

wherein, the radio frequency source 4 and the intensity modulator 3 are connected through a cable;

the first optical coupler 21, the first optical coupler 22 and the second photoelectric detector 112 are connected through optical fiber jumpers;

the first optical coupler 22, the gas absorption cell 14 and the second photoelectric detector 113 are connected through optical fiber jumpers;

the second photoelectric detector 112, the analog-to-digital converter 15a, the digital signal processor 16, the current driving circuit 17 and the semiconductor laser 1 are connected in sequence through cables;

the second photodetector 113, the second analog-to-digital converter 152 and the digital signal processor 16 are connected in sequence through a cable;

the semiconductor laser 1 is used for generating a single-frequency optical signal as a light source of a photoelectric oscillator with stable frequency; the first optical coupler 21 is used for dividing a single-frequency optical signal generated by the semiconductor laser 1 into two paths with equal power, wherein one path is used as a light source of the photoelectric oscillator to generate an electric signal, and the other path is used as a frequency stability monitoring signal;

the semiconductor laser 1, the intensity modulator 3, the radio frequency source 4, the optical filter 5, the optical amplifier 6, the phase modulator 7, the polarization controller 8, the notch filter 9, the long optical fiber 10, the first photodetector 111, the electric coupler 12, and the electric amplifier 13 are used for constituting a photoelectric oscillator, and the generation of a frequency sweep (single frequency) electric signal is realized. The intensity modulator 3 is used for electro-optical modulation; the radio frequency source 4 is used for generating a frequency sweep (single frequency) microwave signal; the semiconductor laser 1, the intensity modulator 3 and the radio frequency source 4 are used for generating a single-frequency optical carrier and a frequency sweeping (single-frequency) optical sideband; the optical filter 5 is used for filtering out a certain frequency sweeping (single frequency) optical sideband as a frequency sweeping (single frequency) optical signal of the photoelectric oscillator; the sweep frequency optical signal, the phase modulator 7, the notch filter 9 and the first photodetector 111 are used for realizing microwave photon filtering and generating a sweep frequency electric signal; the optical amplifier 6 and the electric amplifier 13 are respectively used for increasing the power of optical and electric signals and maintaining the starting state of the photoelectric oscillator; the polarization controller 8 is used for adjusting the polarization state of the optical signal, so that the polarization state of the optical signal entering the notch filter 9 is in an optimal working state; the long optical fiber 10 is used for increasing the optical delay of the loop, improving the quality factor (Q value) of the resonant cavity and improving the signal output quality; the electric coupler is used for dividing the electric signal into two paths and one path is output, and one path forms a closed loop.

The first optical coupler 22, the gas absorption cell, the second photodetector 112, the second photodetector 113, the first analog-to-digital converter 151, the second analog-to-digital converter 152, the digital signal processor 16, and the current driving circuit 17 are used to implement feedback control of the wavelength of the semiconductor laser 1. The first optical coupler 22 is configured to divide the optical signal power input by the coupler 2a into two beams, where one beam directly enters the second photodetector 112 to be converted into an electrical signal, and the power detected by the analog-to-digital converter is converted into a digital signal; the bulk absorption cell 14 is used for absorbing a light signal with a certain wavelength; the second photodetector 113 is used to detect the change of optical power caused by the wavelength shift of the optical signal after passing through the gas absorption cell; the second analog-to-digital converter 152 is used for converting the detected power into a digital signal; the digital signal processor 16 is used for converting the digital signal into an electric signal to control the current driving circuit 17; the current drive circuit 17 is used to control the semiconductor laser 1 to perform fine adjustment of the optical signal wavelength.

The technical solution of the present invention is further explained with reference to the accompanying drawings and specific embodiments.

As shown in fig. 2, the frequency-stabilized optoelectronic oscillator according to the present invention includes a semiconductor laser 1, a first optical coupler 21, an intensity modulator 3, an rf source 4, an optical filter 5, an optical amplifier 6, a phase modulator 7, a polarization controller 8, a notch filter 9, a long optical fiber 10, a first photodetector 111, an electric coupler 12, an electric amplifier 13, a first optical coupler 22, a gas absorption cell 14, a second photodetector 112, a second photodetector 113, a first analog-to-digital converter 151, a second analog-to-digital converter 152, a digital signal processor 16, and a current driving circuit 17; the semiconductor laser 1, the first optical coupler 21, the intensity modulator 3, the optical filter 5, the optical amplifier 6, the phase modulator 7, the polarization controller 8, the notch filter 9, the long optical fiber 10 and the first photoelectric detector 111 are connected in sequence through optical fiber jumpers; wherein the first photoelectric detector 111, the electric coupler 12, the electric amplifier 13 and the phase modulator 7 are connected in sequence through cables; wherein, the radio frequency source 4 and the intensity modulator 3 are connected through a cable; the first optical coupler 21, the first optical coupler 22 and the second photoelectric detector 112 are connected through optical fiber jumpers; the first optical coupler 22, the gas absorption cell 14 and the second photoelectric detector 113 are connected through optical fiber jumpers; the second photoelectric detector 112, the analog-to-digital converter 15a, the digital signal processor 16, the current driving circuit 17 and the semiconductor laser 1 are connected in sequence through cables; the second photodetector 113, the second analog-to-digital converter 152 and the digital signal processor 16 are connected in sequence through a cable; the semiconductor laser 1 is used for generating a single-frequency optical signal as a light source of a photoelectric oscillator with stable frequency; the first optical coupler 21 is used for dividing a single-frequency optical signal generated by the semiconductor laser 1 into two paths with equal power, wherein one path is used as a light source of the photoelectric oscillator to generate an electric signal, and the other path is used as a frequency stability monitoring signal; the semiconductor laser 1, the intensity modulator 3, the radio frequency source 4, the optical filter 5, the optical amplifier 6, the phase modulator 7, the polarization controller 8, the notch filter 9, the long optical fiber 10, the first photodetector 111, the electric coupler 12, and the electric amplifier 13 are used for constituting a photoelectric oscillator, and the generation of a frequency sweep (single frequency) electric signal is realized. The intensity modulator 3 is used for electro-optical modulation; the radio frequency source 4 is used for generating a frequency sweep (single frequency) microwave signal; the semiconductor laser 1, the intensity modulator 3 and the radio frequency source 4 are used for generating a single-frequency optical carrier and a frequency sweeping (single-frequency) optical sideband; the optical filter 5 is used for filtering out a certain frequency sweeping (single frequency) optical sideband as a frequency sweeping (single frequency) optical signal of the photoelectric oscillator; the sweep frequency optical signal, the phase modulator 7, the notch filter 9 and the first photodetector 111 are used for realizing microwave photon filtering and generating a sweep frequency electric signal; the optical amplifier 6 and the electric amplifier 13 are respectively used for increasing the power of optical and electric signals and maintaining the starting state of the photoelectric oscillator; the polarization controller 8 is used for adjusting the polarization state of the optical signal, so that the polarization state of the optical signal entering the notch filter 9 is in an optimal working state; the long optical fiber 10 is used for increasing the optical delay of the loop, improving the quality factor (Q value) of the resonant cavity and improving the signal output quality; the electric coupler is used for dividing the electric signal into two paths and one path is output, and one path forms a closed loop. The first optical coupler 22, the gas absorption cell, the second photodetector 112, the second photodetector 113, the first analog-to-digital converter 151, the second analog-to-digital converter 152, the digital signal processor 16, and the current driving circuit 17 are used to implement feedback control of the wavelength of the semiconductor laser 1. The first optical coupler 22 is configured to divide the optical signal power input by the coupler 2a into two beams, where one beam directly enters the second photodetector 112 to be converted into an electrical signal, and the power detected by the analog-to-digital converter is converted into a digital signal; the gas absorption cell 14 is used for absorbing a light signal with a certain wavelength; the second photodetector 113 is used to detect the change of optical power caused by the wavelength shift of the optical signal after passing through the gas absorption cell; the second analog-to-digital converter 152 is used for converting the detected power into a digital signal; the digital signal processor 16 is used for converting the digital signal into an electric signal to control the current driving circuit 17; the flow driving circuit 17 is used to control the semiconductor laser 1 to perform fine adjustment of the optical signal wavelength.

The semiconductor laser 1 is used for generating a single-frequency optical signal as a light source of a photoelectric oscillator with stable frequency; the first optical coupler 21 is used for dividing a single-frequency optical signal generated by the semiconductor laser 1 into two paths with equal power, wherein one path is used as a light source of the photoelectric oscillator to generate an electric signal, and the other path is used as a frequency stability monitoring signal;

as shown in fig. 2, the semiconductor laser 1, the intensity modulator 3, the radio frequency source 4, the optical filter 5, the optical amplifier 6, the phase modulator 7, the polarization controller 8, the notch filter 9, the long optical fiber 10, the first photodetector 111, the electric coupler 12, and the electric amplifier 13 are used to form an optoelectronic oscillator, thereby generating a swept frequency (single frequency) electric signal. The intensity modulator 3 is used for electro-optical modulation; the radio frequency source 4 is used for generating a frequency sweep (single frequency) microwave signal; the semiconductor laser 1, the intensity modulator 3 and the radio frequency source 4 are used for generating a single-frequency optical carrier and a frequency sweeping (single-frequency) optical sideband; when a single-frequency optical signal output by the semiconductor laser 1 is input to the intensity modulator 3 and a frequency-sweeping (single-frequency) electrical signal generated by the radio frequency source 4 is modulated to the intensity modulator 3, an output optical signal of the intensity modulator 3 is a single-frequency optical carrier and a positive and negative frequency-sweeping (single-frequency) optical sideband; the optical filter 5 is used for filtering out a certain frequency sweeping (single frequency) optical sideband as a frequency sweeping (single frequency) optical signal of the photoelectric oscillator; the sweep frequency optical signal, the phase modulator 7, the notch filter 9 and the first photodetector 111 are used for realizing microwave photon filtering and generating a sweep frequency electric signal; the sweep frequency optical signal enters the phase modulator 7, because a noise signal exists in a link, an output signal of the phase modulator 7 contains optical sidebands with equal power and opposite phases, at the moment, the power or the phase of the optical sidebands with a certain wavelength is changed after the optical signal is filtered by the notch filter 9, and then the first photoelectric detector 111 performs photoelectric conversion, so that microwave photon filtering is realized, and a sweep frequency (single frequency) electric signal is generated; the optical amplifier 6 and the electric amplifier 13 are respectively used for increasing the power of optical and electric signals and maintaining the starting state of the photoelectric oscillator; the polarization controller 8 is used for adjusting the polarization state of the optical signal, so that the polarization state of the optical signal entering the notch filter 9 is in an optimal working state; the long optical fiber 10 is used for increasing the optical delay of the loop, improving the quality factor (Q value) of the resonant cavity and improving the signal output quality; the electric coupler is used for dividing the electric signal into two paths and one path is output, and one path forms a closed loop.

As shown in fig. 2, the first optical coupler 22, the gas absorption cell, the second photodetector 112, the second photodetector 113, the first analog-to-digital converter 151, the second analog-to-digital converter 152, the digital signal processor 16, and the current driving circuit 17 are used to implement feedback control of the wavelength of the semiconductor laser 1.

As shown in fig. 2, the first optical coupler 22 is configured to divide the optical signal power input by the coupler 2a into two beams, where one beam directly enters the second photodetector 112 and is converted into an electrical signal, and the power detected by the analog-to-digital converter is converted into a digital signal, and at this time, if the wavelength of the optical signal drifts, the optical power does not change significantly, so that the power of the electrical signal output by the second photodetector 112 is relatively stable; the gas absorption cell 14 is used for absorbing a light signal with a certain wavelength; the second photodetector 113 is used to detect the change of optical power caused by the wavelength shift of the optical signal after passing through the gas absorption cell; the absorption peak of the gas absorption cell has a certain width, namely the optical power attenuation value of the optical signal is maximum at a certain wavelength, and the optical power attenuation value is gradually reduced until almost no attenuation when the optical signal gradually moves towards two sides; therefore, the output electric power of the second photodetector 113 varies differently with the left and right wavelength shifts, and the second analog-to-digital converter 152 converts the output electric power of the second photodetector 113 into a digital signal; the digital signal processor 16 is configured to analyze and process digital signals input by the first analog-to-digital converter 151 and the second analog-to-digital converter 152, and output an electrical signal to control the current driving circuit 17; the current driving circuit 17 is used for controlling the semiconductor laser 1 to perform fine tuning of the optical signal wavelength so as to realize that the frequency-stabilized optoelectronic oscillator works in a more stable state.

So far, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. Further, the above definitions of the various elements and methods are not limited to the various specific structures, shapes or arrangements of parts mentioned in the examples, which may be easily modified or substituted by those of ordinary skill in the art.

From the above description, those skilled in the art should clearly recognize that the frequency-stabilized optoelectronic oscillator of the present disclosure.

In summary, the present disclosure provides a frequency-stabilized optoelectronic oscillator, which converts the wavelength of an optical signal into a power change, detects the power change in real time by a photodetector, and performs real-time feedback control by a digital signal processor, so as to ensure the wavelength stability of the output optical signal of a laser, thereby stabilizing the frequency of an electrical signal generated by a system.

It should also be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present disclosure. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present disclosure.

And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

Unless otherwise indicated, the numerical parameters set forth in the specification and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". Generally, the expression is meant to encompass variations of ± 10% in some embodiments, 5% in some embodiments, 1% in some embodiments, 0.5% in some embodiments by the specified amount.

Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

The use of ordinal numbers such as "first," "second," "third," etc., in the specification and claims to modify a corresponding element does not by itself connote any ordinal number of the element or any ordering of one element from another or the order of manufacture, and the use of the ordinal numbers is only used to distinguish one element having a certain name from another element having a same name.

In addition, unless steps are specifically described or must occur in sequence, the order of the steps is not limited to that listed above and may be changed or rearranged as desired by the desired design. The embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e., technical features in different embodiments may be freely combined to form further embodiments.

Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Also in the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.

The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.