CN106452432A - Photoelectric phase demodulation phase locking device based on Mach-zehnder modulator - Google Patents
Photoelectric phase demodulation phase locking device based on Mach-zehnder modulator Download PDFInfo
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- CN106452432A CN106452432A CN201610776696.6A CN201610776696A CN106452432A CN 106452432 A CN106452432 A CN 106452432A CN 201610776696 A CN201610776696 A CN 201610776696A CN 106452432 A CN106452432 A CN 106452432A
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- 230000005622 photoelectricity Effects 0.000 claims description 31
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims description 2
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/089—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention relates to a photoelectric phase demodulation phase locking device based on a Mach-zehnder modulator. The device comprises a light clock oscillating source, an electric clock oscillating source, the Mach-zehnder modulator, a photoelectric detector, a loop filter, a signal gatherer and a signal feedback link. According to the device, the Mach-zehnder modulator is taken as a photoelectric phase demodulation unit to load an electric clock signal to a light clock signal, and a phase error of the two clock signals is detected through a photoelectric conversion unit, on the other hand, the detected phase error signal is fed back through the loop filer to a light clock signal source or an electric clock signal source to realize locking of the two clock signals. The device is advantaged in that the device has crucial significance to improve performance of microwave photonics systems requiring high coherence signal sources, such as microwave photon radars and coherence communication systems.
Description
Technical field
The present invention relates to optical information processing, specifically a kind of photoelectricity phase demodulation phase-locking device based on Mach-Zehnder modulator.
Background technology
Photoelectricity lock-in techniques the generation of high stable signal source, the realization of high resolution measurement equipment, optical signal process
There is important application with aspects such as the synchronizations of transmission and large-scale scientific equipment, light similar to traditional radio frequency Phase Lock Technique
Electric locking system can be by the frequency of controlled signal and reference signal and PGC demodulation so that their frequency and phase place keep solid
Fixed relation.According to the different mechanism of phase discriminator in photoelectricity locking system, controlled signal and reference signal both can be optical signals,
It can also be the signal of telecommunication.By photoelectricity locking system, controlled signal and reference signal height coherent can be made, have each other
Identical phase noise characteristic, and then also reduce the phase noise of system while improving the stability of system.This for
Lifting photon radar and coherent communication etc. need the performance of the Microwave photonics system of high coherent pulse signalf, have very crucial work
With.
Photoelectricity phase demodulation Phase Lock Technique mainly includes following several：
A kind of is photoelectricity phase demodulation Phase Lock Technique (J.Kim, J.A.Cox, Chen J, F.X. based on optical non-linear effectDrift-free femtosecond timing synchronization of remote optical and
microwave sources.Nature Photonics,2008,2:733-736.), the research of non-linear phenomena is allowed with people
Have developed multiple nonlinear optical crystals, what these crystal had can be used to carry out the frequency conversion of laser, have can be right
The intensity of laser pulse, phase place are modulated, also can realize the Hologram Storage to laser signal, application is quite varied.
In these crystal, have frequency-doubled effect (SHG) with and frequency effect crystal optical phase detect in have very big application before
Scape.In fiber optic transmission system long haul, using the photon phase discriminator of the crystal composition with SHG effect, measurement sending and receiving end letter
Phase offset between number is simultaneously fed back, and can effectively overcome performance in the PGC demodulation in conventional optical communication systems to be limited to reflect
The problem that phase device degree of balance and noise limit, but the shortcoming of this phase discriminator is system employs more optical glass, and structure is relatively
For complicated it is difficult to integrated.
Refer to that the different laser of two bundle frequencies injects some second nonlinear materials with frequency effect in optical non-linear effect
The phenomenon of the light of both frequency sums after on material, can be produced in addition to the light of two kinds of incident frequencies.Based on frequency crystal
Photon phase discriminator and photoelectricity locking system (J.Kim, J.A.Cox, Chen J, F.X.Drift-free
femtosecond timing synchronization of remote optical and microwave
sources.Nature Photonics,2008,2:733-736.) employ all optical fibre structure, the stability of system is high.This
Outward, this phase discriminator employs balanced structure, effectively eliminates the noise of channel mismatch introducing.But this phase discriminator also has some to lack
Point, such as system structure complicated it is difficult to integrated.Meanwhile, the performance of nonlinear crystal and stability are affected by environment big, make system
Suitable environment be restricted.
Another kind of photoelectricity phase demodulation Phase Lock Technique based on microwave photon device, optical technology is applied to microwave system by this technology
In system, using the advantages such as the high bandwidth of optical system, low-loss, strong antijamming capability carry out microwave signal process, produce with
Transmission.Phase-detection and locking are carried out to optical signal, most straightforward approach is to convert optical signals to the signal of telecommunication, then using electricity
Phaselocked loop carries out phase demodulation lock phase.In this approach it is only necessary to the prime of RF mixer adds PD, just have devised a kind of base
Photoelectricity phase discriminator in RF mixer.This photoelectricity phase discriminator can be widely used in photoelectricity locking system (T.K.Kim,
Y.Song,K.Jung,C.Kim,H.Kim,C.H.Nam,and J.Kim.Sub-100-as timing jitter optical
pulse trains from mode-locked Er-fiber lasers.Optics letters,2011,36(22):
4443-4445.), the program is applied to the locking between the locking of optical signal and the signal of telecommunication and optical signal, and its principle is simple,
Cost of implementation is low.But limited by the bandwidth of RF mixer it is impossible to apply in high frequency, the system of high bandwidth.Additionally, this mirror
Phase device is because mixer channel is unbalance, intermodulation distortion, PD thermal noise, PD power supply ripple the shortcomings of, lead to system noise relatively
Greatly.
In order to avoid the non-equilibrium noise bringing of passage in phase discriminator, current people begin one's study the photoelectricity of some self-balancings
Phase discriminator, among this, receives numerous concern (K.Jung, J.Kim.Sub- based on the photoelectricity phase discriminator of Sagnac ring
femtosecond synchronization of microwave oscillators with mode-locked Er-
fiber lasers.Optics letters,2012,37(14):2958-2960.).Photoelectricity phase discriminator based on Sagnac ring
It is applied to the locking between optical signal and the signal of telecommunication.This phase discriminator employs balanced structure, effectively eliminates channel mismatch and brings
Noise.Further, since the operating frequency of phase-modulator is wider with bandwidth of operation, this phase discriminator can be applied wide at some
In band, the synchronization system of high-frequency signal.The shortcoming of this phase discriminator is that structure is relative complex, and the adjustment of system, maintenance cost are higher,
And it is difficult to integrated.
However, existing photoelectricity phase demodulation Phase Lock Technique system structure, cost, performance and integrated between all there is restriction
Relation is it is therefore desirable to propose a kind of new photoelectricity phase demodulation phase-locking device.
Content of the invention
Present invention aims to above-mentioned the deficiencies in the prior art, propose a kind of based on Mach-Zehnder modulator
Photoelectricity phase demodulation phase-locking device.This device adopts Mach-Zehnder modulator as electric light phase demodulation unit, and electrical clock signal is loaded onto
Optical clock signal, then detects the phase error of two clock signals through a photoelectric conversion unit.On the other hand, this dress
Put by the phase error signal detecting is fed back to optical clock signal source or electrical clock signal source by loop filter, that is,
Can achieve the locking of two clock signals.
Technical scheme is as follows：
A kind of photoelectricity phase demodulation phase-locking device based on Mach-Zehnder modulator, its feature be including Optical Clock oscillation source,
Mach-Zehnder modulator, electric clock oscillation source, photodetector, signal picker, loop filter and signal feedback link,
Described Optical Clock oscillation source is used for the optical clock signal providing electric light phase demodulation to lock phase, and described electric clock oscillation source is used for providing
Electric light phase demodulation locks the electrical clock signal of phase, and described Mach-Zehnder modulator is used for for electrical clock signal being loaded onto Optical Clock letter
Number, described photodetector is used for converting optical signals to the signal of telecommunication, and described loop filter is used for filtering in signal
High fdrequency components, described signal picker is used for the phase error signal that collection and analysis detect, described signal feedback link
Road is used for for detect two signal phase error feeding back to electric clock oscillation source or Optical Clock oscillation source, and described Optical Clock shakes
The outfan swinging source is connected with the first input end of described Mach-Zehnder modulator, the output in described electric clock oscillation source
End is connected with the second input of described Mach-Zehnder modulator, the described outfan of Mach-Zehnder modulator with described
Photodetector be connected, a described part for the outfan of photodetector is connected with described information acquisition device, another
The partly input through described loop filter, signal feedback link and described Optical Clock oscillation source or described electric clock
The input of oscillation source is connected, to realize Optical Clock oscillation source lock when described signal feedback link is connected with Optical Clock oscillation source
Fixed to electric clock oscillation source, described signal feedback link when being connected with electric clock oscillation source, to realize electric clock oscillation source
It is locked to Optical Clock oscillation source.
Described Optical Clock oscillation source using but be not limited to laser with active-passive lock mould, active mode locking laser instrument or modulating frequency
Comb.
Described electric clock oscillation source using but be not limited to voltage controlled oscillator or the comprehensive source of frequency.
Described Mach-Zehnder modulator using but be not limited to lithium niobate electrooptic modulator, polymer electrooptical modulator, silicon
Basis set becomes electrooptic modulator or spatial light modulator, and its output form is single output or dual output.
Described photodetector using but be not limited to PIN pipe or APD pipe, its input form be single input or balance defeated
Enter.
Described loop filter using but be not limited to radio frequency low pass filter.
Described signal picker adopts real-time oscilloscope, data collecting card or Spectrum Analyzer.
Described signal feedback link using but be not limited to power amplifier, PID servomechanism.
Based on above technical characterstic, the present invention has advantages below：
1st, it is based on Mach-Zehnder modulator, make systematic function be better than most photoelectricity locking systems after optimization, simplify experiment
System, reduces system cost, is easy to miniaturization and integrated.
2nd, noise level is low, it is possible to achieve the high-acruracy survey to phase noise.
Brief description
Fig. 1 is an example structure figure based on the photoelectricity phase demodulation phase-locking device of Mach-Zehnder modulator for the present invention
Fig. 2 is that electrical clock signal locks time domain waveform schematic diagram with optical clock signal
Fig. 3 is phase noise test result schematic diagram,
Fig. 3 a is electric light, the measurement result of Photoelectric lock timing relative phase noise,
Fig. 3 b is electric light, the measurement result of the relative time clock shake of Photoelectric lock timing
Specific embodiment
Provide a specific embodiment of the present invention below in conjunction with the accompanying drawings.Before the present embodiment is the technical scheme is that
Carry and being implemented, give detailed embodiment and process, but protection scope of the present invention is not limited to following embodiments.
The structure of the embodiment based on the photoelectricity phase demodulation phase-locking device of Mach-Zehnder modulator for the present invention as shown in figure 1, this
Invention is included based on the photoelectricity phase demodulation phase-locking device of Mach-Zehnder modulator：Optical Clock oscillation source 1 is used for producing optical clock signal
2, the electrical clock signal 5 that electric clock oscillation source 4 produces is loaded onto optical clock signal 2 by Mach-Zehnder modulator 3, the knot obtaining
Fruit, through photodetector 6, changes into the signal of telecommunication 7 and is input to signal picker 8, carry out the collection analysises of phase error；Separately
On the one hand, the error signal detecting filters the radio-frequency component of signal through loop filter 9, anti-by signal feedback link 10
It is fed to Optical Clock oscillation source 1 or electric clock oscillation source 4, thus realizing for optical clock signal 2 being locked to electrical clock signal 5 or by electricity
Clock signal 5 is locked to optical clock signal 2.
Said process achieves the mixing of optical clock signal and electrical clock signal by Mach-Zehnder modulator, and in light
Achieve collection and the analysis of phase error signal by signal picker after electricity conversion；On the other hand, said process passes through ring
Road filtering generates feedback signal, and by signal feedback link, signal is fed back to electric clock generation module or Optical Clock generation mould
Block, and then achieve the PGC demodulation between electric clock and Optical Clock.This is for lifting microwave photon radar and coherent communication system
System etc. needs the performance of the Microwave photonics system of high coherent pulse signalf signal source, has very crucial effect.
Claims (8)
1. a kind of photoelectricity phase demodulation phase-locking device based on Mach-Zehnder modulator is it is characterised in that include Optical Clock oscillation source
(1), Mach-Zehnder modulator (3), electric clock oscillation source (4), photodetector (6), signal picker (8), loop filter
(9) and signal feedback link (10), described Optical Clock oscillation source (1) is used for the optical clock signal providing electric light phase demodulation to lock phase,
Described electric clock oscillation source (4) is used for the electrical clock signal providing electric light phase demodulation to lock phase, described Mach-Zehnder modulator
(3) it is used for for electrical clock signal being loaded onto optical clock signal, described photodetector (6) is used for converting optical signals to telecommunications
Number, described loop filter (9) is used for filtering the high fdrequency components in signal, described signal picker (8) be used for collection and
Analyze the phase error signal detecting, described signal feedback link (10) is used for will be anti-for detect two signal phase error
It is fed to electric clock oscillation source (4) or Optical Clock oscillation source (1), the described outfan of Optical Clock oscillation source (1) and described horse
The first input end of conspicuous-zehnder modulators (3) is connected, and the described outfan of electric clock oscillation source (4) and described Mach-once
Second input of moral manipulator (3) is connected, the described outfan of Mach-Zehnder modulator (3) and described photodetection
Device (6) is connected, and a described part for outfan for photodetector (6) is connected with described information acquisition device (8), another portion
The input or described of the loop filter (9) described in lease making, signal feedback link (10) and described Optical Clock oscillation source (1)
Electric clock oscillation source (4) input be connected, when described signal feedback link (10) is connected with Optical Clock oscillation source (1) with
Realize Optical Clock oscillation source and be locked to electric clock oscillation source, described signal feedback link (10) with electric clock oscillation source (4)
During connection, it is locked to Optical Clock oscillation source to realize electric clock oscillation source.
2. the photoelectricity phase demodulation phase-locking device based on Mach-Zehnder modulator according to claim 1 is it is characterised in that institute
The Optical Clock oscillation source stated using but be not limited to laser with active-passive lock mould, active mode locking laser instrument or modulating frequency comb.
3. the photoelectricity phase demodulation phase-locking device based on Mach-Zehnder modulator according to claim 1 is it is characterised in that institute
The electric clock oscillation source stated using but be not limited to voltage controlled oscillator or the comprehensive source of frequency.
4. the photoelectricity phase demodulation phase-locking device based on Mach-Zehnder modulator according to claim 1 is it is characterised in that described
Mach-Zehnder modulator using but be not limited to lithium niobate electrooptic modulator, polymer electrooptical modulator, silicon substrate integrated electro-optic adjust
Device processed or spatial light modulator, its output form is single output or dual output.
5. the photoelectricity phase demodulation phase-locking device based on Mach-Zehnder modulator according to claim 1 is it is characterised in that described
Photodetector using but be not limited to PIN pipe or APD pipe, its input form be single input or balanced input.
6. the photoelectricity phase demodulation phase-locking device based on Mach-Zehnder modulator according to claim 1 is it is characterised in that described
Loop filter using but be not limited to radio frequency low pass filter.
7. the photoelectricity phase demodulation phase-locking device based on Mach-Zehnder modulator according to claim 1 is it is characterised in that described
Signal picker adopt real-time oscilloscope, data collecting card or Spectrum Analyzer.
8. the photoelectricity phase demodulation phase-locking device based on Mach-Zehnder modulator according to any one of claim 1 to 7, it is special
Levy be described signal feedback link using but be not limited to power amplifier, PID servomechanism.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106842766A (en) * | 2017-03-29 | 2017-06-13 | 上海交通大学 | Coherent light submodule analog-to-digital conversion apparatus |
| CN110690927A (en) * | 2019-09-23 | 2020-01-14 | 中国科学院上海光学精密机械研究所 | Digital-analog hybrid optical phase-locked loop system based on undersampling |
| CN112332911A (en) * | 2020-11-09 | 2021-02-05 | 南京航空航天大学 | Microwave phase discrimination device and phase locking device based on microwave photon technology |
| CN113259008A (en) * | 2021-06-24 | 2021-08-13 | 上海交通大学 | Silicon-based integrated optical frequency transmission system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842766A (en) * | 2017-03-29 | 2017-06-13 | 上海交通大学 | Coherent light submodule analog-to-digital conversion apparatus |
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| CN112332911B (en) * | 2020-11-09 | 2022-01-18 | 南京航空航天大学 | Microwave phase discrimination device and phase locking device based on microwave photon technology |
| CN113259008A (en) * | 2021-06-24 | 2021-08-13 | 上海交通大学 | Silicon-based integrated optical frequency transmission system |
| CN113259008B (en) * | 2021-06-24 | 2022-05-27 | 上海交通大学 | Silicon-based integrated optical frequency transmission system |
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