CN104466619A - Frequency-adjustable triangular wave generating device based on optoelectronic oscillator - Google Patents
Frequency-adjustable triangular wave generating device based on optoelectronic oscillator Download PDFInfo
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- CN104466619A CN104466619A CN201410785413.5A CN201410785413A CN104466619A CN 104466619 A CN104466619 A CN 104466619A CN 201410785413 A CN201410785413 A CN 201410785413A CN 104466619 A CN104466619 A CN 104466619A
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Abstract
A frequency-adjustable triangular wave generating device based on an optoelectronic oscillator comprises a light source, a polarization modulator, an optical coupler, a first polarization controller, a polarizer, a monomode optical fiber, a first photoelectric detector, a tunable narrow-band filter, a power amplifier, a second polarization controller, a polarization beam splitter, a tunable optical delay line, a polarization beam combiner and a second photoelectric detector, and the polarization modulator, the optical coupler, the first polarization controller, the polarizer, the monomode optical fiber, the first photoelectric detector, the tunable narrow-band filter, the power amplifier, the second polarization controller, the polarization beam splitter, the tunable optical delay line, the polarization beam combiner and the second photoelectric detector are connected with the light source in sequence. The input end of the tunable narrow-band filter is connected with the output end of the first photoelectric detector, and the input end of the tunable optical delay line is connected with an output port (2) of the polarization beam splitter. The cost of the frequency-adjustable triangular wave generating device is greatly reduced, microwave signals generated by the optoelectronic oscillator are good in quality and low in phase noise, and generated triangular waves are tunable in frequency.
Description
Technical field
The present invention relates to a kind of triangular wave generation device, a kind of triangular wave generation device of the frequency-adjustable based on optical-electronic oscillator, belongs to Microwave photonics technical field specifically.
Background technology
At modern radar, microwave signal process, in the fields such as radio communication, the millimeter-wave signal of random waveform has application widely.This wherein, microwave triangular signal in pulse compression, photon frequency change, there is indispensable important function in the directions such as signal replication.The generation of microwave triangular signal mainly contains two kinds of methods: one is electrical method, but optical means.Be subject to the restriction of electronic bottleneck, the method bandwidth that circuit produces triangular signal is little, and carrier frequency is low.Because the band of the optics such as optical fiber is roomy, loss is low, anti-electromagnetic interference, the way of various photonic propulsion is applied to microwave triangular signal and produces.Up to the present, the method that all optics produces triangular wave has a common deficiency, namely at least needs the microwave signal source that outside, cost is improved greatly.(W.Li，W.T.Wang，W.H.Sun，W.Y.Wang，and N.H.Zhu，“Generation of triangularwaveforms based on a microwave photonic filter with negativecoefficient，”0pt.Express，vol.22.No.12，pp.14993-15001，Jun.2014.)
Summary of the invention
The object of the invention is to, for the deficiency that prior art exists, provide a kind of triangular wave generation device of the frequency-adjustable based on optical-electronic oscillator, this installation cost reduces greatly; The microwave signal quality that optical-electronic oscillator produces is good, phase noise is low; The triangular signal frequency-tunable produced.
The invention provides a kind of triangular wave generation device of the frequency-adjustable based on optical-electronic oscillator, comprising:
One light source;
One light polarization modulator, its light input end is connected with the output of light source;
One optical coupler, its input is connected with the light output end of light polarization modulator;
One first Polarization Controller, its input is connected with the output port 1 of optical coupler;
One polarizer, its input is connected with the output of the first Polarization Controller;
One monomode fiber, its input is connected with the output of the polarizer;
One first photodetector, its input is connected with the output of monomode fiber;
One tunable narrow-band electrical filter, its input is connected with the output of the first photodetector;
One electric amplifier, its input is connected with the output of tunable narrow-band electrical filter, and its output is connected with the rf inputs of light polarization modulator;
One second Polarization Controller, its input is connected with the output port 2 of optical coupler;
One polarization beam apparatus, its input is connected with the output of the second Polarization Controller;
One tunable optical delay line, its input is connected with the output port 2 of polarization beam apparatus;
One polarization beam combiner, its input port 1 is connected with the output port 1 of polarization beam apparatus, and its input port 2 is connected with the output of tunable optical delay line;
One second photodetector, its input is connected with the output of polarization beam combiner.
As can be seen from technique scheme, the present invention has following beneficial effect:
This device need not external microwave signal source, and installation cost reduces greatly; The microwave signal quality that optical-electronic oscillator produces is good, phase noise is low; The triangular signal frequency-tunable produced.
Accompanying drawing explanation
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, it is as follows that the present invention is described in further detail, wherein:
Fig. 1 is the structural representation based on the triangular wave generation device of the frequency-adjustable of optical-electronic oscillator in the present invention.
Embodiment
Refer to shown in Fig. 1, Fig. 1 shows the triangular wave generation device of the frequency-adjustable based on optical-electronic oscillator that the present invention proposes, and this device comprises:
One light source 1, it is for providing continuous print light carrier;
Wherein, described light source 1 can be semiconductor laser, also can be fiber laser;
One light polarization modulator 2, its light input end is connected with the output of light source 1, it is in different polarization states, on the light carrier that the rf-signal modulation produced by optical-electronic oscillator produces to described light source 1, the signal produced contains carrier and sideband, and the polarization state of carrier and sideband is orthogonal;
Wherein, described light polarization modulator 2 can be lithium columbate crystal also can be semi-conducting polymer or organic polymer;
One optical coupler 3, its input is connected with the light output end of light polarization modulator 2, its two-way being divided into power equal for the light carrier containing sideband exported by described light polarization modulator 2;
Wherein, the optical coupler of the preferred 50:50 of described optical coupler 3;
One first Polarization Controller 4, its input is connected with the output port 1 of optical coupler 3, and it contains the polarization state of the light carrier of sideband for the road that tuning described optical coupler 3 exports;
One polarizer 5, its input is connected with the output of the first Polarization Controller 4, and it projects to the direction identical with the polarizer for the light carrier containing sideband exported by described first Polarization Controller 4;
Wherein said light polarization modulator 2, first Polarization Controller 4, the polarizer 5 acting in conjunction equivalence can become an intensity modulator, namely intensity modulated can be realized to the light carrier that described light source 1 produces, carrier and sideband is no longer mutually vertical, but direction is identical, during device work, need to regulate described first Polarization Controller 4 to make it be operated in linear zone;
One monomode fiber 6, its input is connected with the output of the polarizer 5, and it in optical-electronic oscillator loop, only has enough large could the generation of energy vibrate and produce radiofrequency signal for time delay and storage power;
One first photodetector 7, its input is connected with the output of monomode fiber 6, and it is converted to the signal of telecommunication for the light signal exported by described monomode fiber 6;
One tunable narrow-band electrical filter 8, its input is connected with the output of the first photodetector 7, it carries out filtering for the signal of telecommunication exported by described first photodetector 7, the identical pattern in many intervals can be produced after optical-electronic oscillator loop oscillation, need the pattern choosing needs with tunable narrow-band electrical filter 8;
Wherein, the pass band width of described tunable narrow-band electrical filter 8 is less than 30MHz, and passband is tunable, namely by the passband of tuning tunable narrow-band electrical filter 8, can change and produce triangle wave frequency, thus it is adjustable to realize triangular wave frequency;
One electric amplifier 9, its input is connected with the output of tunable narrow-band electrical filter 8, and its output is connected with the rf inputs of light polarization modulator 2, its signal of telecommunication exported for amplifying described tunable narrow-band electrical filter 8;
Wherein, the band of described electric amplifier 9 is wider than the bandwidth of described tunable narrow-band electrical filter 8;
One second Polarization Controller 10, its input is connected with the output port 2 of optical coupler 3, and it contains the polarization state of the light carrier of sideband for another road that tuning described optical coupler 3 exports;
One polarization beam apparatus 11, its input is connected with the output of the second Polarization Controller 10, and it assigns to two polarization states for the carrier and sideband exported by described second Polarization Controller 10;
One tunable optical delay line 12, its input is connected with the output port 2 of polarization beam apparatus 11, and it carries out light time delay for the carrier wave (or sideband) exported by described polarization beam apparatus 11;
One polarization beam combiner 13, its input port 1 is connected with the output port 1 of polarization beam apparatus 11, and its input port 2 is connected with the output of tunable optical delay line 12, and it is for being synthesized to the direction identical with polarization beam combiner 13 by the carrier and sideband separated;
Wherein, described polarization beam apparatus 11, tunable optical delay line 12, polarization beam combiner 13 use jointly can form a tunable microwave photon filter, by regulating the length of described tunable optical delay line 12, the filtering of the different frequency signal of telecommunication can be realized, because the frequency component of triangular wave microwave signal is only containing odd harmonic, therefore need above-mentioned tunable microwave photon filter to suppress even-order harmonic;
One second photodetector 14, its input is connected with the output of polarization beam combiner 13, it is converted to the signal of telecommunication for the light signal containing carrier and sideband exported by described polarization beam combiner 13, and this signal of telecommunication is triangular signal, and its available oscilloscope is observed;
Wherein, described first photodetector 7 and the second photodetector 14 can be photodiodes also can be photomultiplier; Can be indium phosphide also can be silica-base material; The band of described first photodetector 7 and the second photodetector 14 is wider than the bandwidth of described tunable narrow-band electrical filter 8.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1., based on a triangular wave generation device for the frequency-adjustable of optical-electronic oscillator, comprising:
One light source;
One light polarization modulator, its light input end is connected with the output of light source;
One optical coupler, its input is connected with the light output end of light polarization modulator;
One first Polarization Controller, its input is connected with the output port 1 of optical coupler;
One polarizer, its input is connected with the output of the first Polarization Controller;
One monomode fiber, its input is connected with the output of the polarizer;
One first photodetector, its input is connected with the output of monomode fiber;
One tunable narrow-band electrical filter, its input is connected with the output of the first photodetector;
One electric amplifier, its input is connected with the output of tunable narrow-band electrical filter, and its output is connected with the rf inputs of light polarization modulator;
One second Polarization Controller, its input is connected with the output port 2 of optical coupler;
One polarization beam apparatus, its input is connected with the output of the second Polarization Controller;
One tunable optical delay line, its input is connected with the output port 2 of polarization beam apparatus;
One polarization beam combiner, its input port 1 is connected with the output port 1 of polarization beam apparatus, and its input port 2 is connected with the output of tunable optical delay line;
One second photodetector, its input is connected with the output of polarization beam combiner.
2. the triangular wave generation device of the frequency-adjustable based on optical-electronic oscillator according to claim 1, wherein, described light source is semiconductor laser or fiber laser.
3. the triangular wave generation device of the frequency-adjustable based on optical-electronic oscillator according to claim 1, wherein, described light polarization modulator is the light polarization modulator of the light polarization modulator of lithium columbate crystal, the light polarization modulator of semi-conducting polymer or organic polymer.
4. the triangular wave generation device of the frequency-adjustable based on optical-electronic oscillator according to claim 1, wherein, described optical coupler is the optical coupler of 50:50.
5. the triangular wave generation device of the frequency-adjustable based on optical-electronic oscillator according to claim 1, wherein, the pass band width of described tunable narrow-band electrical filter is less than 30MHz, and passband is tunable.
6. the triangular wave generation device of the frequency-adjustable based on optical-electronic oscillator according to claim 1, wherein, the band of described electric amplifier is wider than the bandwidth of described tunable narrow-band electrical filter.
7. the triangular wave generation device of the frequency-adjustable based on optical-electronic oscillator according to claim 1, wherein, described first photodetector and the second photodetector are photodiode or photomultiplier; This first photodetector and the second photodetector are that indium phosphide or silica-base material make; The band of described first photodetector and the second photodetector is wider than the bandwidth of described tunable narrow-band electrical filter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104733985A (en) * | 2015-04-09 | 2015-06-24 | 中国科学院半导体研究所 | Microwave pulse generation device based on Leo optical filter |
| CN107946877A (en) * | 2017-12-08 | 2018-04-20 | 华中科技大学 | A kind of bicyclic optical-electronic oscillator stablized from polarization state |
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| CN102353963A (en) * | 2011-07-15 | 2012-02-15 | 于晋龙 | Distance measuring system for optical domain based dual-loop optoelectronic oscillators |
| CN103986441A (en) * | 2014-05-28 | 2014-08-13 | 中国科学院半导体研究所 | Triangular wave generating device based on four-wave mixing effect |
| CN104051935A (en) * | 2014-06-26 | 2014-09-17 | 中国科学院半导体研究所 | Quadruplicated frequency microwave signal generating device based on photoelectric oscillator |
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2014
- 2014-12-17 CN CN201410785413.5A patent/CN104466619A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102353963A (en) * | 2011-07-15 | 2012-02-15 | 于晋龙 | Distance measuring system for optical domain based dual-loop optoelectronic oscillators |
| CN103986441A (en) * | 2014-05-28 | 2014-08-13 | 中国科学院半导体研究所 | Triangular wave generating device based on four-wave mixing effect |
| CN104051935A (en) * | 2014-06-26 | 2014-09-17 | 中国科学院半导体研究所 | Quadruplicated frequency microwave signal generating device based on photoelectric oscillator |
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| WEI LI: "Generation of triangular waveforms based on a microwave photonic filter with negative coefficient", 《OPTICS EXPRESS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104733985A (en) * | 2015-04-09 | 2015-06-24 | 中国科学院半导体研究所 | Microwave pulse generation device based on Leo optical filter |
| CN107946877A (en) * | 2017-12-08 | 2018-04-20 | 华中科技大学 | A kind of bicyclic optical-electronic oscillator stablized from polarization state |
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