CN104659637A - Photoelectric oscillator based on optical resonant cavity - Google Patents
Photoelectric oscillator based on optical resonant cavity Download PDFInfo
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- CN104659637A CN104659637A CN201510103877.8A CN201510103877A CN104659637A CN 104659637 A CN104659637 A CN 104659637A CN 201510103877 A CN201510103877 A CN 201510103877A CN 104659637 A CN104659637 A CN 104659637A
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Abstract
The invention discloses a photoelectric oscillator based on an optical resonant cavity, and aims to carry out photoelectric oscillation on laser so as to generate high-quality microwave signals. The photoelectric oscillator consists of a laser, a photoelectric modulator, an amplifier, a filter, a photoelectric detector and an optical resonant cavity which form a loop, wherein the loop forms the main structure of the photoelectric oscillator. The photoelectric oscillator disclosed by the invention has outstanding advantages in generating high-quality microwave signals in a light domain, and high-quality microwave signals can be formed through multiple times of oscillation; the optical resonant cavity is adopted to output the microwave signals through multiple times of oscillation, and the invention mainly aims to minimize the photoelectric oscillator; the optical resonant cavity is adopted to replace conventional long optical fibers, so that the photoelectric oscillator has the characteristics of small size, low consumption, stable performance and the like, and is applicable to the field of radio wireless communication and microwave photonics; the optical resonant cavity is realized through coupled prisms and micro disc cavities and thus is relatively stable in property when being compared with an optical resonant cavity realized through coupled waveguide and micro discs.
Description
Technical field
The present invention relates to a kind of optical-electronic oscillator, be specially a kind of optical-electronic oscillator based on optical resonator, belong to microwave and photoelectron technical field.
Background technology
Optical-electronic oscillator (OEO:Optoelectronic oscillator) is a kind of high performance microwave signal generation apparatus.Rely on the development of Microwave photonics, optical-electronic oscillator adopts photoelectric feedback loop technology, laser energy is converted to microwave signal energy.Optical-electronic oscillator is for traditional oscillator, there is extremely low phase noise, break away from traditional microwave oscillator and raised with frequency the restriction that performance can reduce of making an uproar mutually, with the noiselike signal of optical, electrical two kinds of form stable outputs, a kind of novel high-quality microwave signal source can have been become.Optical-electronic oscillator not only has certain tunable performance, and can produce frequency from a few GHz to GHz, Q value up to a hundred up to 10
10the signal of telecommunication, have a extensive future, receive and pay close attention to widely.The monomode fiber of traditional long optical fibers optical-electronic oscillator has extremely low loss, and loss is 0.2dB/km, can produce the microwave signal of pole low phase noise, and the Q value of several kilometers of long optical fibers reaches 10
10.But there is certain defect in current long optical fibers optical-electronic oscillator: 1) high q-factor and single-mode output conflicting.2) outside environmental elements such as temperature, mechanical oscillation etc. can impact the part opto-electronic device of optical-electronic oscillator and loop-length appearance.Because the movement of polarization state to temperature and optical fiber of laser is bending responsive all especially, in fact the change of polarization state can cause the change of effective cavity length, thus frequency of oscillation is drifted about.Because ambient temperature and mechanical oscillation can cause the change of fiber lengths and propagation constant, cause the change of resonance frequency.3) opto-electronic device that optical-electronic oscillator is discrete is not easily miniaturized, which has limited the practical application of optical-electronic oscillator.In order to solve these defects of optical-electronic oscillator, replace the long optical fibers in original optical-electronic oscillator with optical resonator.4) limit producing a large amount of frequency intervals very little is touched by the feedback loop that long optical fibers is formed, and cause the gain competition between Bian Mo and main mould, but these limit mode noises is difficult to by a filter filtering.
Summary of the invention
The object of the invention is to solve above-mentioned problems of the prior art, and a kind of optical-electronic oscillator based on optical resonator is provided.This optical-electronic oscillator structure is simple, and cost is lower, and frequency loss is stablized, and integrated, miniaturization can produce high-quality microwave signal, and the noise of oscillator signal is much smaller than existing optical-electronic oscillator.
The present invention is achieved through the following technical solutions:
Based on an optical-electronic oscillator for optical resonator, comprise laser, electrooptic modulator, amplifier, filter, photodetector and optical resonator; Wherein, laser is connected with the input of electrooptic modulator, the output of electrooptic modulator is connected with the input of optical resonator, the output of optical resonator is connected with the input of photodetector, the output of photodetector is connected with the input of filter, the output of filter is connected with the input of amplifier, and the output of amplifier is connected with the output of electrooptic modulator, and this i.e. OEO output microwave signal; The closed electro-optical feedback loop of laser, electrooptic modulator, amplifier, filter, photodetector and optical resonator composition.
Described optical resonator is the CaF of Whispering-gallery-mode (WGM)
2resonant cavity, this optical resonator is compared to that long optical fibers optical-electronic oscillator is more integrated and temperature is more stable.The CaF of Whispering-gallery-mode
2resonant cavity can realize single-side band modulation while the function realizing energy storage and frequency-selecting, while guarantee signal low phase noise, reduces OEO loop-length, thus reduces modal noise.This optical resonator is coupled with couple prism, and couple prism both sides are respectively equipped with input collimater and output collimater, and input collimater is connected with the output of electrooptic modulator, and output collimater is connected with the input of photodetector; Optical resonator is by CaF
2material is made, and the diameter of optical resonator is 5mm, thickness is 1mm, and it is the dominant loss source of resonant cavity that material absorbs, and the material absorption loss of crystal is very little, and Nature comparison stablizes so the ultrapure monocrystalline CaF that selects
2as the material of resonant cavity; Couple prism is made by BK7 glass, refractive index n=1.52.Optical resonator utilizes the vibration of light field in micro-dish to complete He Ne laser, is limited in cavity by input light by total internal reflection.This optical resonator selects couple prism to be coupled, other couplant of comparing, and the sensitiveness of rigid structure to the vibration in environment that optical resonator and prism-coupled are formed is lower.
Described laser is that wavelength and power are adjustable tunable laser, and laser is positioned in the light path of this optical-electronic oscillator, for providing injection light signal for this optical-electronic oscillator.
Described electrooptic modulator is that Mach increases Dare electrooptic modulator, uses intensity modulated, goes phase place or the intensity of modulated optical carrier with applied electronic signal.
Described amplifier is microwave amplifier, and microwave amplifier is the reactatron being operated in microwave/millimeter wave frequency range, for providing gain for optical-electronic oscillator.
Described filter is microwave band-pass filter or microwave tunable optic filter or band pass filter, for the noise of filtering radiofrequency signal, only retains the signal of telecommunication near frequency of oscillation.Under the effect of ultra-narrow bandwidth filter modeling, single pattern starting of oscillation can be realized, thus reach the effect suppressing limit to be touched, make the microwave signal of output have phase noise low, spuious little.
Described photodetector is used for high-speed optical signal to be converted to the signal of telecommunication.
The frequency of oscillation that optical-electronic oscillator of the present invention produces is corresponding with the FSR of optical resonator, does not therefore have the parastic wasp caused because of postponing at oscillation spectrum.
The operation principle of optical-electronic oscillator of the present invention is: the continuous light signal that DC laser light source (laser) sends is after electro-optic intensity modulator (electrooptic modulator) modulation, enter energy-storage travelling wave tube optical resonator, the light signal exported from optical resonator is converted to the signal of telecommunication through photodetector, filter enters into after carrying out modeling filtering to this signal of telecommunication after amplifier carries out modeling amplification and feeds back to electrooptic modulator, thus forms complete positive feedback loop.Produce self-oscillation when gain total in loop is greater than total loss, the circulation ripple phase shift in loop produces in-phase stacking close to the frequency of the integral multiple of 2 in resonant cavity, and resonance strengthens.The frequency of oscillation of optical-electronic oscillator is determined jointly by the bandwidth of optical resonator, modulator and the pass-band performance of microwave filter.Microwave amplifier provides the gain of oscillator signal, after repeatedly feeding back circulation, within the extremely short time, just can set up stable vibration.Therefore, can export modulated light signal and microwave signal, this, in the advantage communicated and signal transacting field is huge, is very superior photoelectricity mixed source simultaneously.The FSR that the meeting of the dish-type resonant cavity of special diameter is corresponding certain, when the frequency of Injection Signal is in the FSR of dish-type resonant cavity, has the advantage in mode competition, and Injection Signal will produce significant resonance and strengthen, and then realizes stably singlemode resonance.Resonant cavity (Whispering-gallery-mode resonant cavity) instead of the long optical fibers in Traditional photovoltaic oscillator, successfully achieves the miniaturization of optical-electronic oscillator, the harmonious single-mode output of frequency-adjustable.
The microwave signal that optical-electronic oscillator of the present invention produces high-quality in the optical domain shows obvious advantage, can form high-quality microwave signal by multiple oscillation; The present invention utilizes optical resonator being exported microwave signal by multiple oscillation, serves as theme with optical-electronic oscillator miniaturization; Structure of the present invention is simple, instead of traditional long optical fibers, has volume little, the features such as loss is low, stable performance with optical resonator, is suitable for light carrier radio communication and Microwave photonics field; In the present invention, optical resonator realizes, than more stable with micro-optical resonator performance be coupled of coiling with waveguide with prism and the coupling of micro-dish chamber.
Beneficial effect of the present invention is as follows:
1) structure of the present invention is more simply more prone to realize.
2) the present invention uses optical resonator and prism-coupled to replace the long optical fibers of kilometer level, makes the performance of optical-electronic oscillator not be subject to the impact of the factor such as temperature, machinery, more stable.
3) the kilometer level long optical fibers optical resonator in Traditional photovoltaic oscillator and prism-coupled replace by the present invention, achieve the single-mode oscillation of optical-electronic oscillator high stable, and the frequency spectrum obtained have very high spectral purity.
4) the long optical fibers optical resonator that a few km in optical-electronic oscillator is long replaces by the present invention, can realize the miniaturization of optical-electronic oscillator and integrated, can advance the marketization of optical-electronic oscillator.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Fig. 2 is the coupled structure schematic diagram of optical resonator and couple prism in the present invention.
Fig. 3 is the transmission schematic diagram of light in optical resonator of the present invention and couple prism.
In figure: 1-laser, 2-electrooptic modulator, 3-amplifier, 4-filter, 5-photodetector, 6-optical resonator, 7-couple prism, 8-input collimater, 9-output collimater.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1 to Figure 3, a kind of optical-electronic oscillator based on optical resonator, comprises laser 1, electrooptic modulator 2, amplifier 3, filter 4, photodetector 5 and optical resonator 6; Wherein, laser 1 is connected with the input of electrooptic modulator 2, the output of electrooptic modulator 2 is connected with the input of optical resonator 6, the output of optical resonator 6 is connected with the input of photodetector 5, the output of photodetector 5 is connected with the input of filter 4, the output of filter 4 is connected with the input of amplifier 3, and the output of amplifier 3 is connected with the output of electrooptic modulator 2; The closed electro-optical feedback loop of laser 1, electrooptic modulator 2, amplifier 3, filter 4, photodetector 5 and optical resonator 6 composition.
During concrete enforcement, described optical resonator 6 is the CaF of Whispering-gallery-mode
2resonant cavity, optical resonator 6 is coupled with couple prism 7, and couple prism 7 both sides are respectively equipped with input collimater 8 and output collimater 9; Optical resonator 6 is by CaF
2material is made, and the diameter of optical resonator 6 is 5mm, thickness is 1mm; Couple prism 7 is made by BK7 glass, refractive index n=1.52.Described laser 1 is that wavelength and power are adjustable tunable laser; Described electrooptic modulator 2 is Mach increasing Dare electrooptic modulator; Described amplifier 3 is microwave amplifier; Described filter 4 is microwave band-pass filter or microwave tunable optic filter or band pass filter.
Claims (3)
1. based on an optical-electronic oscillator for optical resonator, it is characterized in that: comprise laser (1), electrooptic modulator (2), amplifier (3), filter (4), photodetector (5) and optical resonator (6); Wherein, laser (1) is connected with the input of electrooptic modulator (2), the output of electrooptic modulator (2) is connected with the input of optical resonator (6), the output of optical resonator (6) is connected with the input of photodetector (5), the output of photodetector (5) is connected with the input of filter (4), the output of filter (4) is connected with the input of amplifier (3), and the output of amplifier (3) is connected with the output of electrooptic modulator (2); The closed electro-optical feedback loop of laser (1), electrooptic modulator (2), amplifier (3), filter (4), photodetector (5) and optical resonator (6) composition.
2. the optical-electronic oscillator based on optical resonator according to claim 1, is characterized in that: the CaF that described optical resonator (6) is Whispering-gallery-mode
2resonant cavity, optical resonator (6) is coupled with couple prism (7), and couple prism (7) both sides are respectively equipped with input collimater (8) and output collimater (9); Optical resonator (6) is by CaF
2material is made, and the diameter of optical resonator (6) is 5mm, thickness is 1mm; Couple prism (7) is made by BK7 glass, refractive index n=1.52.
3. the optical-electronic oscillator based on optical resonator according to claim 1 and 2, is characterized in that: described laser (1) is adjustable tunable laser for wavelength and power; Described electrooptic modulator (2) is Mach increasing Dare electrooptic modulator; Described amplifier (3) is microwave amplifier; Described filter (4) is microwave band-pass filter or microwave tunable optic filter or band pass filter.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105514764A (en) * | 2015-12-17 | 2016-04-20 | 北京无线电计量测试研究所 | Optoelectronic oscillator based on bidirectional injection locking structure |
| CN105896235A (en) * | 2016-06-08 | 2016-08-24 | 中国科学技术大学 | Optoelectronic oscillator based on multilayer film echo wall mode optical microcavity |
| CN106654810A (en) * | 2017-03-02 | 2017-05-10 | 濮阳光电产业技术研究院 | Multi-loop optical micro-cavity low-phase-noise photoelectric oscillator |
| CN106785853A (en) * | 2017-03-21 | 2017-05-31 | 中国科学院长春光学精密机械与物理研究所 | A kind of optical resonator coupled system |
| CN107026382A (en) * | 2016-01-29 | 2017-08-08 | 华为技术有限公司 | A kind of optical-electronic oscillator |
| CN107181709A (en) * | 2017-06-27 | 2017-09-19 | 中国人民解放军理工大学 | Photon compression sampling device based on ultrahigh speed chaos random demodulation technology |
| CN105490135B (en) * | 2015-12-17 | 2018-09-07 | 北京无线电计量测试研究所 | A kind of millimeter-wave frequency generation device |
| CN108923226A (en) * | 2018-07-16 | 2018-11-30 | 北京无线电计量测试研究所 | A kind of microwave source and its application method |
| CN110718835A (en) * | 2019-10-18 | 2020-01-21 | 北京无线电计量测试研究所 | Novel microwave source |
| CN110729623A (en) * | 2019-10-18 | 2020-01-24 | 北京无线电计量测试研究所 | Microwave source |
| CN112350141A (en) * | 2020-11-02 | 2021-02-09 | 中北大学 | Optical resonant cavity coupling device based on super surface structure prism |
| CN112701555A (en) * | 2020-12-29 | 2021-04-23 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Micro-integrated photoelectric oscillator based on optical microcavity |
| CN115001594A (en) * | 2022-04-21 | 2022-09-02 | 电子科技大学 | Miniaturized broadband tunable low-phase-noise photoelectric oscillator |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105514764A (en) * | 2015-12-17 | 2016-04-20 | 北京无线电计量测试研究所 | Optoelectronic oscillator based on bidirectional injection locking structure |
| CN105490135B (en) * | 2015-12-17 | 2018-09-07 | 北京无线电计量测试研究所 | A kind of millimeter-wave frequency generation device |
| CN107026382A (en) * | 2016-01-29 | 2017-08-08 | 华为技术有限公司 | A kind of optical-electronic oscillator |
| CN107026382B (en) * | 2016-01-29 | 2019-06-11 | 华为技术有限公司 | A kind of optical-electronic oscillator |
| CN105896235B (en) * | 2016-06-08 | 2019-04-05 | 中国科学技术大学 | Optical-electronic oscillator based on multilayer film echo wall mode optical micro-cavity |
| CN105896235A (en) * | 2016-06-08 | 2016-08-24 | 中国科学技术大学 | Optoelectronic oscillator based on multilayer film echo wall mode optical microcavity |
| CN106654810A (en) * | 2017-03-02 | 2017-05-10 | 濮阳光电产业技术研究院 | Multi-loop optical micro-cavity low-phase-noise photoelectric oscillator |
| CN106785853B (en) * | 2017-03-21 | 2020-06-09 | 中国科学院长春光学精密机械与物理研究所 | Optical resonant cavity coupling system |
| CN106785853A (en) * | 2017-03-21 | 2017-05-31 | 中国科学院长春光学精密机械与物理研究所 | A kind of optical resonator coupled system |
| CN107181709B (en) * | 2017-06-27 | 2023-08-18 | 中国人民解放军理工大学 | Photon compression sampler based on ultra-high-speed chaotic random demodulation technology |
| CN107181709A (en) * | 2017-06-27 | 2017-09-19 | 中国人民解放军理工大学 | Photon compression sampling device based on ultrahigh speed chaos random demodulation technology |
| CN108923226A (en) * | 2018-07-16 | 2018-11-30 | 北京无线电计量测试研究所 | A kind of microwave source and its application method |
| CN110729623A (en) * | 2019-10-18 | 2020-01-24 | 北京无线电计量测试研究所 | Microwave source |
| CN110718835A (en) * | 2019-10-18 | 2020-01-21 | 北京无线电计量测试研究所 | Novel microwave source |
| CN112350141A (en) * | 2020-11-02 | 2021-02-09 | 中北大学 | Optical resonant cavity coupling device based on super surface structure prism |
| CN112701555A (en) * | 2020-12-29 | 2021-04-23 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Micro-integrated photoelectric oscillator based on optical microcavity |
| CN115001594A (en) * | 2022-04-21 | 2022-09-02 | 电子科技大学 | Miniaturized broadband tunable low-phase-noise photoelectric oscillator |
| CN115001594B (en) * | 2022-04-21 | 2024-03-08 | 电子科技大学 | Miniaturized broadband tunable low-phase-noise photoelectric oscillator |
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Application publication date: 20150527 |