CN114336226B - Photoelectric oscillator and method based on balance detection noise suppression - Google Patents
Photoelectric oscillator and method based on balance detection noise suppression Download PDFInfo
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- CN114336226B CN114336226B CN202111430716.1A CN202111430716A CN114336226B CN 114336226 B CN114336226 B CN 114336226B CN 202111430716 A CN202111430716 A CN 202111430716A CN 114336226 B CN114336226 B CN 114336226B
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Abstract
The application discloses a photoelectric oscillator and a method based on balanced detection noise suppression, wherein, after the output light of a laser is subjected to amplitude modulation by an electro-optical modulator, a modulated light signal is generated; dividing the modulated optical signal into two paths by using an optical fiber loop, wherein one path of the modulated optical signal is output to a first port through long-loop energy storage, and the other path of the modulated optical signal is output to a second port through short-loop energy storage; and generating differential electric signals by carrying out balance detection on the optical signals of the first port and the second port, and selecting frequencies by a filter to serve as modulation signals of the electro-optical modulator. The application solves the problems of unstable oscillation starting and poor near carrier frequency phase noise of the photoelectric oscillator.
Description
Technical Field
The application relates to the field of photoelectric oscillators based on balance detection noise suppression.
Background
The structure of the photoelectric oscillator mainly comprises a single ring and a double ring, and comprises a light source, an electro-optic modulator, an optical fiber loop, a photoelectric detector, a filter, a power divider and a microwave amplifier.
Because the current photoelectric oscillator is limited in structure, the starting vibration is unstable, and the near carrier frequency phase noise is poor, the photoelectric oscillator structure based on balanced detection noise suppression is needed, and therefore the purposes of stable starting vibration and excellent near carrier frequency phase noise are achieved.
Disclosure of Invention
The invention aims to provide a photoelectric oscillator and a method based on balanced detection noise suppression, which solve the problems of unstable oscillation starting and poor near carrier frequency phase noise of the photoelectric oscillator.
In one aspect, the application provides a photoelectric oscillation method based on balanced detection noise suppression, which comprises the following steps:
the output light of the laser is subjected to amplitude modulation by an electro-optical modulator to generate a modulated light signal;
dividing the modulated optical signal into two paths by using an optical fiber loop, wherein one path of the modulated optical signal is output to a first port through long-loop energy storage, and the other path of the modulated optical signal is output to a second port through short-loop energy storage;
And generating differential electric signals by carrying out balance detection on the optical signals of the first port and the second port, and selecting frequencies by a filter to serve as modulation signals of the electro-optical modulator.
On the other hand, the embodiment of the application also provides an optoelectronic oscillator based on balance detection noise suppression, which comprises a laser source, an electro-optical modulator, an optical fiber loop, a balance detector, a filter, a microwave amplifier and a power divider.
The output light of the laser is subjected to amplitude modulation by an electro-optical modulator to generate a modulated light signal, and the modulated light signal enters an optical fiber loop;
in the optical fiber loop, the modulated optical signal is divided into two paths, one path of the modulated optical signal is output to the first input end of the balance detector through long-loop energy storage, and the other path of the modulated optical signal is output to the other end of the balance detector through short-loop energy storage;
The balance detector outputs an electric signal, and one path of the electric signal is used as an output signal after passing through the filter, the microwave amplifier and the power divider, and the other path of the electric signal is used as a modulation signal of the electro-optic modulator.
The above at least one technical scheme adopted by the embodiment of the application can achieve the following beneficial effects:
The device can optimize the phase noise characteristic of the photoelectric oscillator, and has stronger inhibition effect on the intensity noise of a light source, the optical fiber loop noise and the modulation-demodulation noise. In order to suppress these noises, the patent proposes a photoelectric oscillator device based on a noise suppression structure of a balanced detector, and the advantage of the structure is that common noises in a two-way optical fiber link are differentially suppressed by utilizing a two-way differential noise suppression technology of the balanced detector, so that the influence of light source intensity noises, optical fiber loop noises and electro-optical modulation and demodulation noises on the phase noise performance of the photoelectric oscillator is greatly reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a diagram of a method of photoexcitation based on balanced detection noise suppression in accordance with the present application;
fig. 2 shows an embodiment of the application of an optoelectronic oscillator based on balanced detection noise suppression.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 shows a photoelectric oscillation method based on balanced detection noise suppression according to the application.
The application provides a photoelectric oscillation method based on balanced detection noise suppression, which comprises the following steps:
Step 11, generating a modulated optical signal after amplitude modulation of output light of the laser through an electro-optical modulator;
Step 12, dividing the modulated optical signal into two paths by using an optical fiber loop, wherein one path of the modulated optical signal is output to a first port through long-loop energy storage, and the other path of the modulated optical signal is output to a second port through short-loop energy storage;
And 13, generating differential electric signals by carrying out balance detection on the optical signals of the first port and the second port, and selecting frequencies by a filter to serve as modulation signals of the electro-optical modulator.
Fig. 2 shows an embodiment of the application of an optoelectronic oscillator based on balanced detection noise suppression.
According to the present invention, in order to implement the method of the application embodiment, there is provided an optoelectronic oscillator device based on balanced detection noise suppression, the device including: balance detector.
The output end of the light source 11 is connected with an input end single mode fiber of the electro-optic modulator 12, the modulation end of the electro-optic modulator is connected with a modulation output end radio frequency cable of the power divider, the output end of the electro-optic modulator is connected with an input end single mode fiber of the optical fiber loop 13, the balance 1 end of the optical fiber loop is connected with an input 1 end single mode fiber of the balance detector 14, the balance 2 end of the optical fiber loop is connected with an input 2 end single mode fiber of the balance detector, the output end of the balance detector is connected with an input end radio frequency cable of the filter 15, the output end of the filter is connected with an input end radio frequency cable of the microwave amplifier 16, the output end of the microwave amplifier is connected with an input end radio frequency cable of the power divider 17, and the signal end of the power divider is used as an interface for stabilizing output signals.
As the best embodiment of the application, the line width of the light source is smaller than 10kHz, the wavelength is 1550nm plus or minus 20nm, and the output optical power is +1dBm; the input optical wavelength of the electro-optical modulator is 1550nm plus or minus 20nm, the optical input power is > +5dBm, the frequency range of an electric modulation signal is 1 GHz-40 GHz, the input electric signal power is > +0dBm, and the optical insertion loss is 8dB. The optical fiber loop is formed by combining a long optical fiber and a short optical fiber, wherein the length of the long optical fiber is 10km, and the long loop is formed; the short optical fiber has a length of 2km, and forms the short loop. The input light wavelength of the balance detector is 1550nm, the maximum input light power is +16dBm, the bandwidth is 40GHz, the common mode rejection ratio is 15dB, and the dark current is 5nA. The input frequency range of the microwave amplifier is 1 GHz-40 GHz, the gain is +70dB, and the saturated output power is +18dBm. The input frequency range of the filter is 1 GHz-40 GHz, the 3dB bandwidth is not more than 10MHz (for example, the 3dB bandwidth is 10 MHz), and the insertion loss is 2dB.
When the device works, the light source outputs continuous wave laser, the laser is subjected to amplitude modulation with a radio frequency signal through the electro-optic modulator, the modulated laser is subjected to two paths through an optical fiber loop, one path of the modulated laser is subjected to energy storage through a long loop, the other path of the modulated laser is subjected to energy storage through a short loop, after the two paths of energy storage laser are simultaneously sent into the balance detector, the intensity noise of the light source, the optical fiber loop noise and the electro-optic modulation and demodulation noise are greatly optimized through a differential suppression principle, the laser is converted into an electric signal after passing through the balance detector, the electric signal passes through a narrow-band bandpass filter, so that spectral lines beyond a main carrier frequency are suppressed, the main spectral lines are extracted, the electric signal after passing through the filter is subjected to loop gain compensation through the microwave amplifier, one path of electric signal output by the power divider is input to the electro-optic modulator for amplitude modulation on the basis of meeting a certain gain, and closed-loop oscillation is realized, and the other output interface of the power divider is used as the signal output of the photoelectric oscillator.
The photoelectric oscillator device based on the noise suppression structure of the balance detector has the advantages that common noise in a double-path optical fiber link is subjected to differential suppression by utilizing the double-path differential noise suppression technology of the balance detector, so that the influence of light source intensity noise, optical fiber loop noise and electro-optic modulation and demodulation noise on the phase noise performance of the photoelectric oscillator is greatly reduced.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (6)
1. A photoelectric oscillation method based on balanced detection noise suppression comprises the following steps:
the output light of the laser is subjected to amplitude modulation by an electro-optical modulator to generate a modulated light signal;
dividing the modulated optical signal into two paths by using an optical fiber loop, wherein one path of the modulated optical signal is output to a first port through long-loop energy storage, and the other path of the modulated optical signal is output to a second port through short-loop energy storage;
The optical signals of the first port and the second port are subjected to differential inhibition on common noise in a two-way optical fiber link through balance detection, differential electric signals are generated, after frequency selection of a filter, loop gain compensation is performed through a microwave amplifier, one electric signal is output and input to an electro-optical modulator for amplitude modulation on the basis of meeting a certain gain, closed-loop oscillation is realized, and the other output interface is used as the signal output of an optoelectronic oscillator.
2. An optoelectronic oscillator based on balanced detection noise suppression for implementing the method of claim 1, comprising a laser source, an electro-optic modulator, an optical fiber loop, a balanced detector, a filter, a microwave amplifier, and a power divider;
The output light of the laser is subjected to amplitude modulation by an electro-optical modulator to generate a modulated light signal, and the modulated light signal enters an optical fiber loop;
in the optical fiber loop, the modulated optical signal is divided into two paths, one path of the modulated optical signal is output to the first input end of the balance detector through long-loop energy storage, and the other path of the modulated optical signal is output to the other end of the balance detector through short-loop energy storage;
The balance detector outputs an electric signal, and one path of the electric signal is used as an output signal after passing through the filter, the microwave amplifier and the power divider, and the other path of the electric signal is used as a modulation signal of the electro-optic modulator.
3. The optoelectronic oscillator based on balanced detected noise suppression according to claim 2,
The optical fiber loop is formed by combining a long optical fiber and a short optical fiber, wherein the length of the long optical fiber is 10km, and the long loop is formed; the short optical fiber has a length of 2km, and forms the short loop.
4. The optoelectronic oscillator based on balanced detected noise suppression according to claim 2,
The filter is a narrow bandpass filter with a bandwidth of not more than 10 MHz.
5. The optoelectronic oscillator based on balanced detected noise suppression according to claim 2,
The line width of the light source is smaller than 10KHz.
6. The optoelectronic oscillator based on balanced detected noise suppression according to claim 2,
The input light wavelength of the balance detector is 1550nm, the maximum input light power is +16dBm, the bandwidth is 40GHz, and the common mode rejection ratio is 15dB.
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| KR20130068328A (en) * | 2011-12-15 | 2013-06-26 | 홍익대학교 산학협력단 | Optoelectronic oscillators with highly-suppressed spurious tones using dual-loop modulation of semiconductor lasers under strong optical injection and method for dual-loop modulation |
| WO2018076551A1 (en) * | 2016-10-25 | 2018-05-03 | 北京大学 | Distributed optical fibre sensing system capable of realizing all-phase demodulation, and measuring method therefor |
| CN109273968A (en) * | 2018-11-13 | 2019-01-25 | 北京无线电计量测试研究所 | Optical-electronic oscillator device based on light splitting wire loop |
| CN111678583A (en) * | 2020-06-17 | 2020-09-18 | 珠海任驰光电科技有限公司 | Optical fiber vibration measuring device and method for improving light source noise |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2569764A1 (en) * | 2005-12-01 | 2007-06-01 | Bing Li | Method, system and apparatus for optical phase modulation based on frequency shift |
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| EP1600806A2 (en) * | 1995-08-01 | 2005-11-30 | California Institute Of Technology | Novel opto-electronic oscillators |
| KR20130068328A (en) * | 2011-12-15 | 2013-06-26 | 홍익대학교 산학협력단 | Optoelectronic oscillators with highly-suppressed spurious tones using dual-loop modulation of semiconductor lasers under strong optical injection and method for dual-loop modulation |
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