CN112701555A - Micro-integrated photoelectric oscillator based on optical microcavity - Google Patents
Micro-integrated photoelectric oscillator based on optical microcavity Download PDFInfo
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- CN112701555A CN112701555A CN202011600063.2A CN202011600063A CN112701555A CN 112701555 A CN112701555 A CN 112701555A CN 202011600063 A CN202011600063 A CN 202011600063A CN 112701555 A CN112701555 A CN 112701555A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
- H01S1/02—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range solid
Abstract
The invention relates to a micro-integrated photoelectric oscillator based on an optical microcavity, which comprises: laser generated by a laser is input into the optical microcavity; the optical microcavity performs narrow-band filtering on the spectrum of the laser after storing energy of the input laser and outputs double-frequency laser signals of two adjacent resonance peaks; the photoelectric detector converts the double-frequency laser signal into a microwave signal and outputs the microwave signal to the amplifier; the amplifier performs mode selection amplification on the microwave signal and outputs the microwave signal as the output end of the micro-integrated photoelectric oscillator; and feeding back the microwave signal to the optical microcavity; the second-order nonlinear effect of the microcavity is utilized to replace a Mach-Zehnder modulator in the traditional photoelectric oscillator; the microcavity with extremely high Q value is used as a low-loss dielectric cavity to prolong the photon service life, and the mutual interference of light waves in the microcavity generates resonance to realize a narrow-band filtering function, so that a filter in the traditional photoelectric oscillator is replaced, the number of active devices in the photoelectric oscillator is reduced, and the size, the weight and the power consumption of the photoelectric oscillator are further reduced.
Description
Technical Field
The invention relates to the technical field of microwave photonics, in particular to a micro-integrated photoelectric oscillator based on an optical microcavity.
Background
The high-quality microwave signal has wide application in military and civil fields such as electronic measurement, electronic countermeasure, radar and the like. In conventional microwave signal generation methods, dielectric oscillators often perform undesirably under low noise, high spectral purity, or tunable conditions. The traditional photoelectric oscillator needs a long-distance optical fiber as an energy storage delay line and is provided with a narrow-band filtering element, so that the device is difficult to miniaturize and integrate, and the application scene of the device is greatly limited.
A photoelectric oscillator based on a whispering gallery mode microcavity is used as a novel microwave signal generator, wherein the microcavity is used as a high Q value (up to 10)10) The energy storage element can replace the energy storage and delay effects of a long optical fiber with the length of several kilometers. The photoelectric oscillator can generate high-quality signals with frequencies from several to hundreds of GHz and low phase noise, has tunability and optical and electric outputs, and is a very ideal microwave signal generating device.
The practical micro-integration process of the current photoelectric oscillator based on the micro-cavity mainly has the technical problems in two aspects: (1) the phase noise of the photoelectric oscillator based on various optical resonant cavities is inferior to that of the traditional photoelectric oscillator based on a long optical fiber; (2) the structure is complicated, a plurality of active devices are contained, and the micro integration difficulty is high.
Much attention is paid to the research of micro-cavity optoelectronic oscillators based on whispering gallery modes, including CN104659637A, CN105896235A, CN101911403B, CN104466620, and the like. The optoelectronic oscillator structure in the above patent mainly includes: the laser, the Mach-Zehnder modulator, the RF amplifier, the filter, the photoelectric detector, the polarization controller, the phase shifter, the optical microcavity and the like comprise a plurality of active devices, and the difficulty of further miniaturization of the photoelectric oscillator is increased.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a micro-integrated photoelectric oscillator based on an optical microcavity, which solves the problem that the photoelectric oscillator in the prior art is difficult to miniaturize.
The technical scheme for solving the technical problems is as follows: a micro-integrated optoelectronic oscillator based on an optical microcavity, comprising: the device comprises a laser 1, a polarization controller 2, a photoelectric detector 3, an amplifier 4, a phase shifter 5 and an optical microcavity 6;
the laser generated by the laser 1 is input into the optical microcavity 6;
the optical microcavity 6 performs narrow-band filtering on the spectrum of the laser after storing energy of the input laser, and outputs double-frequency laser signals of two adjacent resonance peaks to the photoelectric detector 3; the polarization controller 2 controls the polarization of the laser input and output by the optical microcavity 6;
the photoelectric detector 3 converts the dual-frequency laser signal into a microwave signal and outputs the microwave signal to the amplifier 4;
the amplifier 4 performs mode selection amplification on the microwave signal and outputs the microwave signal, and an output end of the amplifier 4 is used as an output end of the micro-integrated optoelectronic oscillator and connected with an input end of the phase shifter 5;
the phase shifter 5 is used for carrying out phase control on the input microwave signal and feeding back the microwave signal to the optical microcavity 6.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the laser 1 is a narrow linewidth semiconductor laser that generates laser light with tunable wavelength and power.
Further, the line width of the laser generated by the laser 1 is less than 0.2nm, and the central wavelength range of the laser is 1054-1560 nm.
Further, the photodetector 3 is a balanced PIN photodetector, and the bandwidth is greater than the frequency of the microwave signal generated by the photodetector.
Further, the amplifier 4 is a low noise microwave amplifier.
Further, the optical microcavity 6 is shaped like a disk, a ring or a sphere.
Further, the optical microcavity 6 is made of lithium niobate, lithium tantalate, magnesium fluoride or calcium fluoride.
Furthermore, a connecting optical path between each device of the micro-integrated optoelectronic oscillator adopts a polarization-maintaining optical fiber.
The invention has the beneficial effects that: the second-order nonlinear effect of the microcavity is utilized, the refractive index of the microcavity is changed through the electro-optic effect so as to modulate the resonant wavelength, the electro-optic modulation is realized through a carrier injection mode or a carrier depletion mechanism, and a Mach-Zehnder modulator in the traditional photoelectric oscillator is replaced; the microcavity with extremely high Q value is used as a low-loss dielectric cavity to prolong the photon service life, and the narrow-band filtering function is realized by generating resonance through the mutual interference of light waves in the microcavity, so that a filter in the traditional photoelectric oscillator is replaced; the function of replacing an electro-optical modulator and a filter in a traditional device by the optical microcavity is realized, the number of active devices in the photoelectric oscillator is reduced, the size, the weight and the power consumption of the photoelectric oscillator are further reduced, and the photoelectric oscillator with higher integration level is realized.
Drawings
FIG. 1 is a block diagram of a micro-integrated optoelectronic oscillator based on an optical microcavity according to the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises a laser 2, a polarization controller 3, a photoelectric detector 4, an amplifier 5, a phase shifter 6 and an optical microcavity.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, which is a block diagram of a micro-integrated optoelectronic oscillator based on an optical microcavity according to the present invention, it can be known from fig. 1 that the micro-integrated optoelectronic oscillator includes: the device comprises a laser 1, a polarization controller 2, a photoelectric detector 3, an amplifier 4, a phase shifter 5 and an optical microcavity 6.
The laser light generated by the laser 1 is input into the optical microcavity 6.
The optical microcavity 6 performs narrow-band filtering on the spectrum of the laser after storing energy of the input laser, and outputs double-frequency laser signals of two adjacent resonance peaks to the photoelectric detector 3; the polarization controller 2 controls the polarization of the laser light input and output by the optical microcavity 6.
The photodetector 3 converts the dual-frequency laser signal into a microwave signal and outputs the microwave signal to the amplifier 4.
The amplifier 4 outputs the microwave signal after carrying out mode selection amplification, and the output end of the amplifier 4 is used as the output end of the micro-integrated photoelectric oscillator and is connected with the input end of the phase shifter 5.
The phase shifter 5 is used for controlling the phase of the input microwave signal and feeding the microwave signal back to the optical microcavity 6.
Laser emitted by the laser 1 enters the optical microcavity 6 for energy storage after passing through the polarization controller 2 and performs narrow-band filtering on the spectrum of the laser, and dual-frequency laser signals of two adjacent resonant peaks are output from the optical microcavity 6, wherein the optical frequency difference is the free spectral width. The double-frequency laser signal generates a microwave signal with the frequency of the difference between the two optical signals due to the beat frequency after passing through the photoelectric detector 3, the microwave signal is output after being subjected to mode selection amplification by the amplifier 4, and the microwave signal can also be fed back to the optical microcavity 6 through the phase shifter 5, so that a complete feedback loop is formed. When the total gain in the loop is larger than the loss, the self-oscillation occurs, the amplifier 4 provides gain for the oscillation signal, so that stable oscillation can be established in the loop after multiple cycles, and the microwave signal output is realized.
According to the micro-integrated photoelectric oscillator of the optical microcavity, the second-order nonlinear effect of the microcavity is utilized, the refractive index of the microcavity is changed through the electro-optical effect so as to modulate the resonant wavelength, the electro-optical modulation is realized through a carrier injection mode or a carrier depletion mechanism, and a Mach-Zehnder modulator in the traditional photoelectric oscillator is replaced; the microcavity with extremely high Q value is used as a low-loss dielectric cavity to prolong the photon service life, and the narrow-band filtering function is realized by generating resonance through the mutual interference of light waves in the microcavity, so that a filter in the traditional photoelectric oscillator is replaced; the function of replacing an electro-optical modulator and a filter in a traditional device by the optical microcavity is realized, the number of active devices in the photoelectric oscillator is reduced, the size, the weight and the power consumption of the photoelectric oscillator are further reduced, and the photoelectric oscillator with higher integration level is realized.
Example 1
The laser light generated by the laser 1 is input into the optical microcavity 6.
Specifically, the laser 1 is a narrow linewidth semiconductor laser that generates laser light with tunable wavelength and power.
The line width of the laser generated by the laser 1 is less than 0.2nm, and the central wavelength range of the laser is 1054-.
In order to ensure the stability of laser wavelength, the laser should adopt TEC and other modes to control temperature.
The optical microcavity 6 performs narrow-band filtering on the spectrum of the laser after storing energy of the input laser, and outputs double-frequency laser signals of two adjacent resonance peaks to the photoelectric detector 3; the polarization controller 2 controls the polarization of the laser light input and output by the optical microcavity 6.
The photodetector 3 converts the dual-frequency laser signal into a microwave signal and outputs the microwave signal to the amplifier 4.
Specifically, the photodetector 3 is a balanced PIN photodetector, and the bandwidth is greater than the frequency of the microwave signal generated by the photodetector.
The amplifier 4 outputs the microwave signal after carrying out mode selection amplification, and the output end of the amplifier 4 is used as the output end of the micro-integrated photoelectric oscillator and is connected with the input end of the phase shifter 5.
Specifically, the amplifier 4 may be an erbium-doped fiber amplifier, a semiconductor optical amplifier, or the like.
The phase shifter 5 is used for controlling the phase of the input microwave signal and feeding the microwave signal back to the optical microcavity 6.
Specifically, the optical microcavity 6 is shaped like a disk, a ring, or a sphere. The optical microcavity 6 is made of a dielectric material such as lithium niobate (LiNbO3), lithium tantalate (LiTaO3), magnesium fluoride (MgF2), or calcium fluoride (CaF 2).
Furthermore, a connecting light path between each device of the micro-integrated photoelectric oscillator adopts a polarization maintaining optical fiber, so that the influence of a polarization state on mode drift is avoided.
When the total gain in the loop is larger than the loss, the self-oscillation occurs, the amplifier 4 provides gain for the oscillation signal, so that stable oscillation can be established in the loop after multiple cycles, and the microwave signal output is realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A micro-integrated optoelectronic oscillator based on an optical microcavity, comprising: the device comprises a laser (1), a polarization controller (2), a photoelectric detector (3), an amplifier (4), a phase shifter (5) and an optical microcavity (6);
the laser generated by the laser (1) is input into the optical microcavity (6);
the optical microcavity (6) stores energy of input laser, performs narrow-band filtering on the spectrum of the laser, and outputs double-frequency laser signals of two adjacent resonance peaks to the photoelectric detector (3); the polarization controller (2) controls the polarization of the laser input and output by the optical microcavity (6);
the photoelectric detector (3) converts the double-frequency laser signal into a microwave signal and outputs the microwave signal to the amplifier (4);
the amplifier (4) performs mode selection amplification on the microwave signal and outputs the microwave signal, and the output end of the amplifier (4) is used as the output end of the micro-integrated optoelectronic oscillator and connected with the input end of the phase shifter (5);
the phase shifter (5) is used for carrying out phase control on the input microwave signal and feeding back the microwave signal to the optical microcavity (6).
2. A micro-integrated optoelectronic oscillator according to claim 1, wherein the laser (1) is a narrow linewidth semiconductor laser generating a laser light tunable in both wavelength and power.
3. The micro-integrated optoelectronic oscillator according to claim 2, wherein the laser (1) generates laser light with a line width less than 0.2nm and a central wavelength in the range of 1054-.
4. The micro-integrated optoelectronic oscillator according to claim 1, wherein the photodetector (3) is a balanced PIN structure photodetector with a bandwidth larger than the frequency of the microwave signal it generates.
5. The micro-integrated optoelectronic oscillator of claim 1, wherein the amplifier (4) is a low noise microwave amplifier.
6. The micro-integrated optoelectronic oscillator according to claim 1, wherein the optical microcavity (6) has a shape of a disk, a ring or a sphere.
7. The micro-integrated optoelectronic oscillator according to claim 1, wherein the material of the optical microcavity (6) is lithium niobate, lithium tantalate, magnesium fluoride or calcium fluoride.
8. The micro-integrated optoelectronic oscillator according to claim 1, wherein the optical connection path between the devices of the micro-integrated optoelectronic oscillator is a polarization maintaining fiber.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114447750A (en) * | 2021-12-23 | 2022-05-06 | 香港理工大学深圳研究院 | Microwave signal generation method and system based on microcavity feedback locked laser |
| CN115001594A (en) * | 2022-04-21 | 2022-09-02 | 电子科技大学 | Miniaturized broadband tunable low-phase-noise photoelectric oscillator |
Citations (4)
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| US20130094532A1 (en) * | 2011-10-07 | 2013-04-18 | The Board Of Trustees Of The University Of Illinois | Opto-Electronic Oscillator And Method |
| CN103703635A (en) * | 2011-05-16 | 2014-04-02 | Oe电波公司 | Generation of single optical tone, RF oscillation signal and optical comb in triple-oscillator device based on nonlinear optical resonator |
| CN104659637A (en) * | 2015-03-10 | 2015-05-27 | 中北大学 | Photoelectric oscillator based on optical resonant 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 |
-
2020
- 2020-12-29 CN CN202011600063.2A patent/CN112701555A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103703635A (en) * | 2011-05-16 | 2014-04-02 | Oe电波公司 | Generation of single optical tone, RF oscillation signal and optical comb in triple-oscillator device based on nonlinear optical resonator |
| US20130094532A1 (en) * | 2011-10-07 | 2013-04-18 | The Board Of Trustees Of The University Of Illinois | Opto-Electronic Oscillator And Method |
| CN104659637A (en) * | 2015-03-10 | 2015-05-27 | 中北大学 | Photoelectric oscillator based on optical resonant 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114447750A (en) * | 2021-12-23 | 2022-05-06 | 香港理工大学深圳研究院 | Microwave signal generation method and system based on microcavity feedback locked laser |
| CN114447750B (en) * | 2021-12-23 | 2024-01-09 | 香港理工大学深圳研究院 | Microwave signal generation method and system based on microcavity feedback locking laser |
| 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: 20210423 |