CN101834670A - High linear response microwave photon signal modulation and demodulation device - Google Patents
High linear response microwave photon signal modulation and demodulation device Download PDFInfo
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Abstract
The invention relates to a high linear response microwave photon signal modulation and demodulation device. The device comprises a dual-frequency optical fibre laser with orthogonal polarization output, an optical phase modulator working in dual-polarization modulation state and a photodetector which are connected in turn. The invention solves the problem that non-linear distortion of analog signals is caused by a photoelectric modulator in the microwave optical fibre transmission system based on the amplitude modulation/direct detection technology, and greatly enhances the performance of the microwave optical fibre transmission system.
Description
Technical field
The invention belongs to fiber optic communication field and analog optical fiber chain-circuit system; More precisely, be the microwave photon signal modulation and demodulation device of high linear response.
Background technology
The research of microwave optical fiber transmission technology mainly concentrates in the raising of system gain, bandwidth, noise figure and Spurious Free Dynamic Range.The thinking that the microwave optical fiber transmission system realizes can be divided into generally incoherent (intensity modulated/directly detect) system and coherent system two classes.Therefore intensity modulated/directly detect phase place and the frequency that (IM/DD) system can not detect light carrier can only pass through intensity modulated mode carrying microwave signal, and this type systematic is realized simple relatively, easy, but the performance that can reach is also limited; And coherent system can be selected amplitude modulation (AM), phase modulation (PM), frequency modulation multiple modulation systems such as (FM), has bigger potentiality on systematic function, and subject matter is system's relative complex, realizes that difficulty is bigger.In general, the technical advantage difference of dual mode, the technical difficult points that faces are also different.
According to the difference of optical modulations, intensity modulated/direct detection system can be divided into again: directly modulation and indirect (or the external modulation) two kinds of modulating.Directly modulation is to realize light intensity modulation by the operating current of direct change laser.The advantage of this modulation technique be simple, low-cost, the third order intermodulation distortion is little, shortcoming be modulation bandwidth limited, have Crosstalk of second order, the luminous efficiency of Stimulated Light device and relative intensity noise (RIN) influence, the gain of system is low, noise factor is high.Although performance is effectively improved, can't fundamentally overcome its inborn disappearance through very big effort.Therefore, the main application of this system is CATV or radio communication.Modulation is at the external optical modulator of laser indirectly, realizes light modulation by applying microwave signal to modulator.Just in time opposite with reactance modulation system, indirectly the advantage applies of modulation system exists: modulation bandwidth is big, Crosstalk of second order is little, can improve system gain by increasing luminous power, because laser works is at continuous light (CW) output state, system noise factor is low.Shortcoming is: the third order intermodulation distortion is serious, problems such as complex structure, cost height.Modulator linearityization is to improve the main means of not having diffusion dynamic range (SFDR) based on the microwave optical fiber transmission system of direct external modulation, and up-to-date research report is to obtain to surpass-130dB-Hz with linearizing modulator
2/3System SFDR.Yet present linearizing optical modulator is made complexity, cost is high.
The coherent fiber transmission technology is all having great potential aspect system dynamics scope (SFDR), gain and the noise, has intrinsic high linear modulation characteristic as phase-modulator, does not need the optimal control of bias point, and making is simple, cost is low; Coherent detection can obtain high system gain and low-noise factor under the situation of low optical power; Coherent system can adopt multiple modulation systems such as phase modulation, amplitude modulation, frequency modulation, accent polarization state.Therefore, at the beginning of the microwave optical fiber transmission technology occurred, the coherent transfer technology just received publicity and studies, but because this technology is very sensitive to the phase noise of laser, caused receiving system complexity, poor stability, and is even unfeasible.So, make way for amplitude modulation(PAM)/direct detection (IM/DD) technology gradually, lose concern.
In sum, the light signal treatment technology has begun to play more and more important effect in mobile communication, radio bandwidth access network, especially aspect the control of millimetre-wave attenuator and smart antenna, the optics of millimeter wave local oscillation signal produces the Modulation and Nonlinear problem aspect of scheme and solution broadband signal will bring into play bigger, more important role.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art with not enough, the microwave photon signal modulation and demodulation device of high linear response is provided, thoroughly solve based in the microwave optical fiber transmission system of amplitude modulation(PAM)/direct detection technology because the nonlinear distortion problem of analog signal that electrooptic modulator causes, greatly improved the performance of microwave optical fiber transmission system.
Purpose of the present invention can be achieved through the following technical solutions: comprise successively the two-frequency laser with polarized orthogonal output that connects, be operated in optical phase modulator and photodetector under the dual-polarization modulation condition.
Described two-frequency laser is distributed feed-back formula laser or distribution Bragg reflector formula laser.
Preferably,, use Polarization Controller and analyzer, be successively placed between described optical phase modulator and the photodetector at receiver in order to improve the detectivity of polarized orthogonal signal.
Preferably,, adopt Polarization Controller and the polarization maintaining optical fibre that differential group delay is provided, be successively placed between described optical phase modulator and the photodetector at transmitter for the simplified receiver structure; Preferred, the differential group delay of described polarization maintaining optical fibre is half of two-frequency laser frequency difference.
Preferably, in order further to simplify the structure of transmitter, the output of described optical phase modulator is a polarization maintaining optical fibre, sets up polarization maintaining optical fibre simultaneously between described optical phase modulator and photodetector; Angle at 45 between the polarization principal axis of the polarization maintaining optical fibre of polarization maintaining optical fibre of being set up and optical phase modulator output.
The present invention has following advantage and effect with respect to prior art:
1, the present invention has adopted the double-frequency optical fiber laser with polarized orthogonal output and has been operated in optical phase modulator under the dual-polarization modulation condition, since this laser self can output phase the double-frequency laser of locking, and the frequency between the double-frequency laser can be at 0.7GHz to tuning between the 30GHz, so in fact this light source is equivalent to the microwave signal that a traditional single frequency laser and light Mach-Zehnder (Mach-Zehnder) modulator and adjustable microwave signal source is realized and is modulated to function on the light carrier.Therefore, the present invention does not need to adopt the light Mach-Zehnder modulator to modulate microwave carrier signals and baseband data signals on light carrier, the analog signal distortion of having avoided the nonlinear effect such as third order intermodulation of light Mach-Zehnder modulator and having caused.Therefore the present invention can fine solution based in the microwave optical fiber transmission system of direct modulation technique because the nonlinear distortion of analog signal that electrooptic modulator causes, effective solution of this problem will greatly improve the performance of microwave optical fiber transmission system.
2, the present invention adopts the polarization maintaining optical fibre of one section length-specific at transmitter, the differential group delay that this section polarization maintaining optical fibre is provided is half of two-frequency laser frequency difference, can make the optical carrier of the polarization state quadrature after the loading broad-band data become the parallel optical carrier of polarization state, therefore can avoid using Polarization Controller and analyzer, simplify receiver structure greatly.
3, fiber laser of the present invention has the characteristics of Ultrashort cavity (effective cavity length 10mm) structure, and the live width of therefore exporting laser is very narrow, can reach even be lower than the 10KHz magnitude, is better than the laser index that the integrated semiconductor technology obtains; The double-frequency laser of the polarized orthogonal of its output produces in same laserresonator, so its output laser has extraordinary coherence; Because the characteristic of its polarized orthogonal has been avoided the caused mode competition of even broadening gain media, the relative intensity noise (RIN) of therefore exporting laser is very little simultaneously.
Description of drawings
Fig. 1 is the schematic diagram of fibre laser to generate microwave signal of the present invention;
Fig. 2 is laser spectroscopy and the microwave spectrum figure that the present invention exports;
Fig. 3 is the structural representation of one embodiment of the invention;
Fig. 4 is the structural representation of another embodiment of the present invention, adopts a Polarization Controller and one section polarization maintaining optical fibre;
Fig. 5 is the light signal schematic diagram of polarization maintaining optical fibre input, output among Fig. 4;
Fig. 6 is the structural representation of another embodiment of the present invention, and the output of optical phase modulator is a polarization maintaining optical fibre, and one section polarization maintaining optical fibre that differential group delay is provided, angle at 45 between the polarization principal axis of these two kinds of polarization maintaining optical fibres.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Embodiment 1
Fiber laser among the present invention is used to produce stable, the adjustable microwave signal source of output, and its principle as shown in Figure 1.11 is the speculum of bragg grating (FBG) as fiber laser among Fig. 1,12 for the er-doped polarization maintaining optical fibre as lasing gain media, distance between two bragg gratings are end-to-end is the effective cavity length of fiber laser, 13 is the polarization maintaining optical fibre wave multiplexer, 14 is the 980nm pump light source, 17 is Polarization Controller, and 18 is analyzer, and 19 is the broadband light electric explorer.The double-frequency laser of this fiber laser output is shown among Fig. 2 15,16, the polarization state direction quadrature of double-frequency laser, by birefringence fast at polarization maintaining optical fibre, that the slow-axis direction stress application changes the er-doped gain fibre, the frequency difference scope of double-frequency laser is adjusted between the 30GHz at 0.7GHz, tuning between promptly the frequency difference of double-frequency laser can realize from 0.7GHz to 30GHz.If, analyzer is exported be connected to beat frequency in the photodetector again with the analyzer connection of the double-frequency laser of polarized orthogonal output with relative both polarization state directions angle at 45, can obtain frequency range at 0.7GHz to microwave signal source between the 30GHz.Figure 2 shows that the output spectrum of polarized orthogonal double-frequency optical fiber laser of experiment test and the microwave signal frequency spectrum that beat frequency produces thereof.Therefore from Fig. 2 as seen, the caused third order intermodulation distortion of light Mach-Zehnder modulator can be avoided fully, utilizes the double-frequency optical fiber laser of polarized orthogonal to solve microwave carrier signals and is modulated to nonlinear problem in the light carrier process.
The structure of present embodiment as shown in Figure 3, comprise successively double-frequency optical fiber laser, the polarization maintaining optical fibre wave multiplexer 54 that connect, be operated in optical phase modulator 59, Transmission Fibers link 510, Polarization Controller 511, analyzer 512, broadband light electric explorer 513 under the dual-polarization modulation condition with polarized orthogonal output, and the pump light source 55 that is connected with polarization maintaining optical fibre wave multiplexer 54,59 that be connected with optical phase modulator, as to be used for amplified broad band data-signal 57 wide-band microwave amplifier 58.The polarization direction angle all at 45 of analyzer and double-frequency laser by the polarized orthogonal behind the optical fiber link.Receiver section comprises interconnective local oscillation signal generator 514, frequency mixer 515, after the beat signal mixing that frequency mixer 515 is produced local oscillation signal and broadband light electric explorer 513, and the baseband data signals 516 after output recovers.
Among Fig. 3 51 is used as the speculum of fiber laser for bragg grating (FBG), 52 for the er-doped polarization maintaining optical fibre as lasing gain media, length between two bragg gratings are end-to-end is the effective cavity length of fiber laser, and effective cavity length is 10mm; Welding point between the polarization maintaining optical fibre of 53 and 56 polarization maintaining optical fibres that are respectively polarization maintaining optical fibre wave multiplexer and optical fiber laser output end, optical phase modulator input is aimed at the TM and the TE mould of optical phase modulator respectively with the cross-polarization light signal of guaranteeing two-frequency laser output.At the output of optical fiber link, by adjusting Polarization Controller 511, make the light signal angle all at 45 of analyzer 512 and polarized orthogonal, the carrier frequency light signal that can make two polarized orthogonals like this is at broadband light electric explorer 513 upper beat frequencies; At receiver, by local oscillation signal generator 514 and frequency mixer 515 restore data, 516 are the baseband data signals after recovering at last.
Different with the light Mach-Zehnder modulator, optical phase modulator has intrinsic high linear modulation characteristic, does not need the optimal control of bias point, and making is simple, cost is low, and therefore tool has great advantage in the analog link system applies.For one communication system, flashlight all is the light signal of single polarization, so the input of optical phase modulator often has an analyzer, only allows the light signal of single polarization to pass through optical phase modulator.But for the double frequency light signal of cross-polarization, the light signal on two polarization directions needs simultaneously by optical phase modulator, so we remove the analyzer of optical phase modulator input, makes it be operated under the dual-polarization modulation condition structure as shown in Figure 3.When optical phase modulator is operated in dual-polarization modulation condition following time, its modulation has Polarization-Sensitive characteristic, and promptly the modulation efficiency by the light signal on two polarization directions (being respectively TM and TE pattern) of optical phase modulator is different.The present invention utilizes the Polarization-Sensitive characteristic of optical phase modulator to realize the data load of the two-frequency laser of polarized orthogonal, broadband signal is loaded on the double-frequency optical fiber laser of polarized orthogonal, owing to be relative modulation to two light carriers of two-frequency laser, so baseband data signals finally is to be loaded on the microwave carrier on the light carrier, rather than baseband modulation.
Embodiment 2
Present embodiment is a kind of execution mode of embodiment 1 being made further optimization.Embodiment 1 needs to use Polarization Controller and analyzer, so that the optical carrier of two polarized orthogonals is at broadband light electric explorer 513 upper beat frequencies behind the optical fiber link and before the receiver; This embodiment has strengthened the complexity of receiver device.Present embodiment utilizes differential group delay can cause the different characteristic of polarization state rotary speed of different frequency light signal, after the output of optical phase modulator with before the optical fiber link, increase the polarization maintaining optical fibre of one section length-specific, the differential group delay that this section polarization maintaining optical fibre is provided is half of two-frequency laser frequency difference, thereby the two carrier wave light signals that make the polarization state quadrature behind the loading data become the parallel two carrier wave light signals of polarization state, receiver can be avoided using Polarization Controller and analyzer like this, greatly reduces the complexity of receiver device.
The structure of present embodiment as shown in Figure 4, comprise successively double-frequency optical fiber laser, the polarization maintaining optical fibre wave multiplexer 74 that connect, be operated in optical phase modulator 79 under the dual-polarization modulation condition with polarized orthogonal output, (its differential group delay is a half of two-frequency laser frequency difference for the polarization maintaining optical fibre 712 of Polarization Controller 710, length-specific, the detectivity of polarized orthogonal signal is the highest, is most preferred scheme.), optical fiber link 714, broadband light electric explorer 715, and the pump light source 75 that is connected with polarization maintaining optical fibre wave multiplexer 74,79 that be connected with optical phase modulator, as to be used for amplified broad band data-signal 77 wide-band microwave amplifier 78.Receiver section comprises interconnective local oscillation signal generator 717, frequency mixer 716, after the beat signal mixing that frequency mixer 716 is produced local oscillation signal and broadband light electric explorer 715, and the baseband data signals 718 after output recovers.In the present embodiment, described optical phase modulator output is an ordinary optic fibre.
71 is the speculum that bragg grating (FBG) is used as fiber laser among Fig. 4, and 72 for the er-doped polarization maintaining optical fibre is used as lasing gain media, and the distance between two fiber gratings are end-to-end is the effective cavity length of laser, and effective cavity length is 10mm; Welding point between the polarization maintaining optical fibre of 73 and 76 polarization maintaining optical fibres that are respectively polarization maintaining optical fibre wave multiplexer and optical fiber laser output end, optical phase modulator input is aimed at the TM and the TE mould of optical phase modulator respectively with the cross-polarization light signal of guaranteeing double-frequency optical fiber laser output.710 is Polarization Controller, 711 for the ordinary optic fibre of optical phase modulator output and above-mentioned differential group delay be welding point between half the polarization maintaining optical fibre 712 of two-frequency laser frequency difference, Polarization Controller 710 will guarantee from angle at 45 between the polarization principal axis of two optical carriers of the polarized orthogonal of optical phase modulator output and polarization maintaining optical fibre 712, differential group delay when polarization maintaining optical fibre 712 is a half of two optical carrier frequency differences of double-frequency optical fiber laser output like this, and the optical carrier of two polarization state quadratures just can be changed to the parallel optical carrier of polarization state.As shown in Figure 5, the optical carrier 719,720 of two polarized orthogonals just can become the parallel optical carrier of polarization state 721,722 by behind the polarization maintaining optical fibre 712.713 is the welding point of polarization maintaining optical fibre and Transmission Fibers.This scheme has been simplified the complexity of receiver device, makes receiver structure of the present invention the same with the receiver structure of traditional scheme.
Identical with embodiment 1 is, tuning between the frequency range of present embodiment double-frequency laser can realize from 0.7GHz to 30GHz.
Embodiment 3
Present embodiment is a kind of execution mode of embodiment 2 being made further optimization.(its differential group delay is a half of two-frequency laser frequency difference to embodiment 2, and the detectivity of polarized orthogonal signal is the highest, is most preferred scheme at the polarization maintaining optical fibre of optical phase modulator and length-specific.) before, need to use Polarization Controller, to guarantee from two optical carriers of the polarized orthogonal of optical phase modulator output and angle at 45 between the polarization principal axis of polarization maintaining optical fibre of differential group delay be provided; This embodiment has strengthened the complexity and the unsteadiness of transmitter apparatus.Present embodiment adopts polarization maintaining optical fibre welding scheme to make the polarization maintaining optical fibre of optical phase modulator output and angle at 45 between the polarization principal axis of polarization maintaining optical fibre (promptly at the polarization maintaining optical fibre between described optical phase modulator and the photodetector) of differential group delay is provided, differential group delay when polarization maintaining optical fibre is a half of two optical carrier frequency differences of double-frequency optical fiber laser output like this, the optical carrier of two polarization state quadratures just can be changed to the parallel optical carrier of polarization state, transmitting terminal can avoid using Polarization Controller like this, greatly reduces the complexity and the unsteadiness of transmitter apparatus.
The structure of present embodiment as shown in Figure 6, comprise successively double-frequency optical fiber laser, the polarization maintaining optical fibre wave multiplexer 64 that connect, be operated in optical phase modulator 69 under the dual-polarization modulation condition with polarized orthogonal output, (its differential group delay is a half of two-frequency laser frequency difference to the polarization maintaining optical fibre 611 of length-specific, the detectivity of polarized orthogonal signal is the highest, is most preferred scheme.), optical fiber link 613, broadband light electric explorer 614, and the pump light source 65 that is connected with polarization maintaining optical fibre wave multiplexer 64,69 that be connected with optical phase modulator, as to be used for amplified broad band data-signal 67 wide-band microwave amplifier 68.Receiver section comprises interconnective local oscillation signal generator 616, frequency mixer 615, after the beat signal mixing that frequency mixer 615 is produced local oscillation signal and broadband light electric explorer 614, and the baseband data signals 617 after output recovers.In the present embodiment, described optical phase modulator output is a polarization maintaining optical fibre.
61 is the speculum that bragg grating (FBG) is used as fiber laser among Fig. 6, and 62 for the er-doped polarization maintaining optical fibre is used as lasing gain media, and the distance between two fiber gratings are end-to-end is the effective cavity length of laser, and effective cavity length is 10mm; Welding point between the polarization maintaining optical fibre of 63 and 66 polarization maintaining optical fibres that are respectively polarization maintaining optical fibre wave multiplexer and optical fiber laser output end, optical phase modulator input is aimed at the TM and the TE mould of optical phase modulator respectively with the cross-polarization light signal of guaranteeing double-frequency optical fiber laser output.610 for the polarization maintaining optical fibre of optical phase modulator output and above-mentioned differential group delay be welding point between half the polarization maintaining optical fibre 611 of two-frequency laser frequency difference, welding point 610 will guarantee angle at 45 between the polarization principal axis of the polarization maintaining optical fibre of optical phase modulator output and polarization maintaining optical fibre 611, differential group delay when polarization maintaining optical fibre 611 is a half of two optical carrier frequency differences of double-frequency optical fiber laser output like this, and the optical carrier of two polarization state quadratures just can be changed to the parallel optical carrier of polarization state.This scheme has been simplified the complexity of transmitter apparatus, makes transmitter architecture of the present invention the same with the transmitter architecture of traditional scheme.
Identical with embodiment 1 is, tuning between the frequency range of present embodiment double-frequency laser can realize from 0.7GHz to 30GHz.
The foregoing description is a preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. the microwave photon signal modulation and demodulation device of high linear response is characterized in that: comprise the two-frequency laser with polarized orthogonal output that connects successively, be operated in optical phase modulator and photodetector under the dual-polarization modulation condition.
2. the microwave photon signal modulation and demodulation device of high linear response according to claim 1, it is characterized in that: described two-frequency laser is distributed feed-back formula laser or distribution Bragg reflector formula laser.
3. the microwave photon signal modulation and demodulation device of high linear response according to claim 1 is characterized in that: also comprise Polarization Controller and analyzer, be successively placed between described optical phase modulator and the photodetector.
4. the microwave photon signal modulation and demodulation device of high linear response according to claim 1 is characterized in that: also comprise Polarization Controller and polarization maintaining optical fibre, be successively placed between described optical phase modulator and the photodetector.
5. the microwave photon signal modulation and demodulation device of high linear response according to claim 4, it is characterized in that: the differential group delay of described polarization maintaining optical fibre is half of two-frequency laser frequency difference.
6. the microwave photon signal modulation and demodulation device of high linear response according to claim 1 is characterized in that: also be included in the polarization maintaining optical fibre between described optical phase modulator and the photodetector; The output of described optical phase modulator is a polarization maintaining optical fibre; Angle at 45 between the polarization principal axis of the polarization maintaining optical fibre of polarization maintaining optical fibre between described optical phase modulator and the photodetector and optical phase modulator output.
7. the microwave photon signal modulation and demodulation device of high linear response according to claim 6, it is characterized in that: the differential group delay of the polarization maintaining optical fibre between described optical phase modulator and the photodetector is half of two-frequency laser frequency difference.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102075258A (en) * | 2011-01-18 | 2011-05-25 | 汉鼎信息科技股份有限公司 | Frequency response balancer by using light carrier Brillouin treatment |
| CN102983911A (en) * | 2012-11-30 | 2013-03-20 | 北京邮电大学 | Method for microwave photon link based on full light spectrum utilization and post-compensation technology |
| CN103490822A (en) * | 2013-09-13 | 2014-01-01 | 南京航空航天大学 | Photon type frequency-multiplication microwave signal amplitude control method and control device |
| CN104202093A (en) * | 2014-09-15 | 2014-12-10 | 中国科学院半导体研究所 | Orthogonal and phase correlation light carrier based photonic microwave frequency mixing device |
| CN105634612A (en) * | 2015-12-29 | 2016-06-01 | 暨南大学 | Linear light modulation method and apparatus based on polarization modulation |
| CN111181653A (en) * | 2016-11-21 | 2020-05-19 | 华为技术有限公司 | Wavelength division multiplexing polarization-independent reflective modulator |
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| CN101478068A (en) * | 2009-01-22 | 2009-07-08 | 上海交通大学 | Microwave signal phase shifting method based on polarized light interference technique |
| CN201392204Y (en) * | 2009-04-20 | 2010-01-27 | 浙江大学 | Optical fiber grating sensing demodulation device based on microwave photon filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101478068A (en) * | 2009-01-22 | 2009-07-08 | 上海交通大学 | Microwave signal phase shifting method based on polarized light interference technique |
| CN201392204Y (en) * | 2009-04-20 | 2010-01-27 | 浙江大学 | Optical fiber grating sensing demodulation device based on microwave photon filter |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075258A (en) * | 2011-01-18 | 2011-05-25 | 汉鼎信息科技股份有限公司 | Frequency response balancer by using light carrier Brillouin treatment |
| CN102075258B (en) * | 2011-01-18 | 2014-02-19 | 汉鼎信息科技股份有限公司 | Frequency response balancer by using light carrier Brillouin treatment |
| CN102983911A (en) * | 2012-11-30 | 2013-03-20 | 北京邮电大学 | Method for microwave photon link based on full light spectrum utilization and post-compensation technology |
| CN102983911B (en) * | 2012-11-30 | 2016-12-21 | 北京邮电大学 | A kind of based on the utilization of full spectrum and the microwave photon link method of post-compensation technology |
| CN103490822A (en) * | 2013-09-13 | 2014-01-01 | 南京航空航天大学 | Photon type frequency-multiplication microwave signal amplitude control method and control device |
| CN103490822B (en) * | 2013-09-13 | 2016-04-20 | 南京航空航天大学 | A kind of photon type frequency-multiplication microwave signal amplitude control method and control device |
| CN104202093A (en) * | 2014-09-15 | 2014-12-10 | 中国科学院半导体研究所 | Orthogonal and phase correlation light carrier based photonic microwave frequency mixing device |
| CN105634612A (en) * | 2015-12-29 | 2016-06-01 | 暨南大学 | Linear light modulation method and apparatus based on polarization modulation |
| CN105634612B (en) * | 2015-12-29 | 2018-04-13 | 暨南大学 | Linear light modulating method and device based on Polarization Modulation |
| CN111181653A (en) * | 2016-11-21 | 2020-05-19 | 华为技术有限公司 | Wavelength division multiplexing polarization-independent reflective modulator |
| CN111181653B (en) * | 2016-11-21 | 2023-03-10 | 华为技术有限公司 | Wavelength division multiplexing polarization-independent reflective modulator |
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Application publication date: 20100915 |