CN103488023B - High-precision optical analog-digital converter - Google Patents
High-precision optical analog-digital converter Download PDFInfo
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- CN103488023B CN103488023B CN201310429079.5A CN201310429079A CN103488023B CN 103488023 B CN103488023 B CN 103488023B CN 201310429079 A CN201310429079 A CN 201310429079A CN 103488023 B CN103488023 B CN 103488023B
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Abstract
A kind of High-precision optical analog-digital converter, comprises: Optical Sampling clock generating module, electric light phase modulation module, optics demultiplexing module, polarization demultiplexing module, opto-electronic conversion and processing module successively.The present invention passes through to adopt the Polarization Modulation based on phase-modulator and polarization interference technology, utilize the synthesis of the orthogonal polarization signals transmitted in same link, realize the optical mode number conversion of High Linear, because two-way orthogonal polarization signals was transmitted in same link all the time before arrival polarization beam apparatus, therefore, the impact by external environment is little, more easily ensures symmetry, compared to based on electro-optic intensity modulator originating party case, there is insertion loss and cost is low, bandwidth is high advantage.
Description
Technical field
The present invention relates to optical information processing technology, specifically a kind of High-precision optical analog-digital converter.
Background technology
Along with the development of digital technology, convert simulating signal to digital signal, then carry out transmitting, store, process and showing becoming inevitable trend.Electricity analog to digital converter (EADC:ElectronicAnalogtoDigitalConverter) owing to being subject to the shake of electric sampling clock, comparer is fuzzy etc. " electronic bottleneck " impact, performance improves further and faces very large challenge.Optical analog-to-digital converter (PADC:PhotonicAnalogtoDigitalConverter) utilizes the Optical Sampling pulse of high stable, the high speed of photonics, the advantage in broadband realize at a high speed, the digitizing of broadband signal, can break through electronic bottleneck, be a kind of effective way realizing high bandwidth, high precision analogue converting system.
Improving precision (significant bit) is one of focus of optical analog-to-digital converter concern.The main scheme of current proposition has the optical analog to digital conversion (P.W.Juodawlkis based on phase encoding, J.J.Hargreaves.R.D.Younger, R.C.Williamson, G.E.Betts, andJ.C.Twichell, OpticalSamplingForHigh-Speed, High-ResolutionAnalog-To-DigitalConverters, InternationalTopicalMeetingonMicrowavePhotonics, 2003.) the light ADC with based on over-sampling realizes high-speed, high precision sampling (Shoop, BarryL.Das, Pankaj, Litynski, Daniel, Photonicanalogtodigitalconversionbasedontemporalandspati aloversamplingtechniques, USPatent6529150, 2003.) etc.Because oversampling technique needs very high over-sampling rate (more than 100) just can exchange high-precision resolution for, seriously limit the sampling rate of system.Based on the optical analog to digital conversion of phase encoding by utilizing the complementarity of dual-port signal, the impact that the Optical Sampling clock amplitude change that can effectively suppress intensity of light source shake etc. to cause and bias point drift about, significantly improves the quantified precision of optical analog-to-digital converter.Meanwhile, the program can realize high sampling rate in conjunction with time-division or wavelength-division multiplex technique.At present, what adopt based on the optical analog to digital conversion of phase encoding is the electro-optic intensity modulator of dual-port.In order to ensure the high complementarity that electro-optic intensity modulator two ports export, require that two of electro-optic intensity modulator arms have high symmetry, and high extinction ratio.Very high requirement is proposed to manufacture craft.Existing commercial dual-port electro-optic intensity modulator cannot support the requirement of high precision optical analog to digital conversion.In addition, the dual-port electro-optic intensity modulator of high bandwidth is expensive.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the invention provides a kind of High-precision optical analog-digital converter based on electro-optic phase modulator (PM:phasemodulator).This optical analog-to-digital converter adopts phase modulation technique, recover to be sampled wideband electrical signal by the complementary type High Linear of two-way orthogonal polarization signals, eliminate the impact that Optical Sampling clock amplitude changes and conventional strength modulation direct current biasing point drifts about with external condition (especially temperature), will the quantified precision of optical analog-to-digital converter be significantly improved.
Technical solution of the present invention is as follows:
A kind of High-precision optical analog-digital converter, comprises: Optical Sampling clock generating module, electric light phase modulation module, optics demultiplexing module, polarization demultiplexing module, opto-electronic conversion and processing module successively.
Described Optical Sampling clock generating module for generation of the Optical Sampling clock of high-repetition-rate, low jitter, linear polarization, the light pulse sequence of m-wavelength-interleaved when being, or the light pulse sequence of co-wavelength.The method realized can adopt but be not limited to spectrum cutting techniques, Optical Time Division Multiplexing Technology, multiple-wavelength laser, multi-laser synthesis.
Described electric light phase modulation module utilizes the sampling of electro-optic phase modulator realization to high-speed electrical signals.Optical Sampling pulse from Optical Sampling clock generating module becomes angle theta with a main shaft (for the purpose of describing simply, be designated as X ' axle, another main shaft is designated as Y ' axle) of polarization direction and phase-modulator
1entering phase-modulator, resolve into the polarized light that two-way polarization direction is parallel with electro-optic phase modulator two main shafts (X ', Y ') respectively, sampling to being sampled electric signal along the transmission of phase place electrooptic modulator.Angle theta between a main shaft (X ' axle) of Optical Sampling pulse polarization direction and phase-modulator
1meet following relation:
γ cos θ
1+ sin θ
1=0 or γ cos θ
1-sin θ
1=0(1)
Wherein, γ is light field along phase place electrooptic modulator X ' direction of principal axis polarization and the ratio of the light field along electro-optic phase modulator Y ' direction of principal axis polarization through the gain coefficient of phase-modulator.To a given phase-modulator, γ is a fixing value.The angle theta between the polarization direction of input Optical Sampling pulse and the main shaft of phase-modulator is regulated through but not limited to Polarization Controller
1meet the condition of formula formula (1).
The electric signal be sampled is added on phase-modulator through the electrical interface of electro-optic phase modulator, carries out phase-modulation to two crossed polarized lights through electro-optic phase modulator.Phase-modulator exports as two-way phase place carries the polarized orthogonal light pulse sequence being sampled signal.
Described optics demultiplexing module is multiple low-speed parallel passages by carrying the high-speed light sampling pulse Series Decomposition being sampled signal message from electro-optic phase modulator.According to the feature of the Optical Sampling clock that Optical Sampling clock generating module exports, optics demultiplexing can adopt corresponding Wave Decomposition multiplex technique or light time decomposition multiplex technology etc. to realize.
Described polarization demultiplexing module comprises multiple polarization beam apparatus, an output channel of the corresponding optics demultiplexing module of each polarization beam apparatus.The main shaft of each polarization beam apparatus and the main shaft of electric light phase-modulation is at 45 ° or 135 ° or 225 ° or 315 ° of angles.Each polarization beam apparatus exports the crossed polarized light that two-way polarization direction is parallel and perpendicular to the main shaft (X) of polarization beam apparatus respectively.
Described opto-electronic conversion and processing module comprise multiple input channel, and a road of the corresponding polarization beam apparatus of each input channel exports.Each input channel there are a photoelectric commutator and an electric analog to digital converter, for converting light signal to electric signal and being quantized into digital signal.Data processing unit subsequently utilizes formula (2) that the two-way output signal synthesis from same polarization beam apparatus is obtained the digitized result that corresponding sampled point is sampled signal, then, again by the digitized result compound of all passages, obtain the final digitized result being sampled signal.
Wherein, I
x, I
ybe respectively the intensity of the two-way output light field of same polarization beam apparatus, obtained by photoelectric commutator and electric analog to digital converter; K is that two bundle polarization directions are respectively along the phase differential of the crossed polarized light of electro-optic phase modulator two major axes orientation after electro-optic phase modulator and the conversion coefficient be sampled between signal voltage.Because the phase response of electro-optic phase modulator all has the good linearity within a large range.Therefore, in a larger voltage range, k is a constant, determines by system calibrating.
In High-precision optical analog-digital converter of the present invention, adopt electro-optic phase modulator as electro optic sampling door, polarization interference is utilized to be obtained being sampled signal by formula (2), because the phase response of electro-optic phase modulator all has the good linearity within a large range, therefore, high Linearity of the system that principle ensure that.Meanwhile, due to the intensity I of the two-way output light of same polarization beam apparatus
x, I
yin same ratio with the change of input Optical Sampling clock, have nothing to do with the intensity of input Optical Sampling clock according to the sampled signal that equation (2) recovers, eliminate the impact of input Optical Sampling clock relative intensity shake, for the realization of High Linear system provides guarantee.
Based on above technical characterstic, the present invention has the following advantages:
1, adopt Polarization Modulation and polarization interference technology, utilize the synthesis of the orthogonal polarization signals transmitted in same link, realize the optical mode number conversion of High Linear.Because two-way orthogonal polarization signals was transmitted all the time before arrival polarization beam apparatus in same link, therefore, the impact by external environment is little, more easily ensures symmetry.
2, adopt general high speed electro-optical phase-modulator, insertion loss, cost low (compared to electro-optic intensity modulator), be with roomy, in very large modulation range, there is the good linearity, make system can realize High Linear, high bandwidth simultaneously;
3, only need independently to control/adjustment input polarization state direction, angle between polarization beam apparatus main shaft and phase-modulator main shaft, can make system export needed for orthogonal polarization signals, thus High Linear recovers to be sampled signal.
Accompanying drawing explanation
The system chart of Fig. 1 High-precision optical analog-digital converter of the present invention.
Fig. 2 is Optical Sampling pulse polarization state change procedure schematic diagram of the present invention.
Embodiment
A most preferred embodiment of the present invention is provided below in conjunction with accompanying drawing.This most preferred embodiment is implemented premised on technical scheme of the present invention, gives detailed embodiment and process, but protection scope of the present invention is not limited to following embodiment.
In this most preferred embodiment, for Optical Sampling clock for time the m-wavelength Optical Sampling clock that maps.As shown in Figure 1, the present embodiment is based on the High-precision optical analog-digital converter of phase-modulator, and this system comprises successively: Optical Sampling clock generating module 1, electric light phase modulation module 2, optics demultiplexing module 3, polarization demultiplexing module 4 and opto-electronic conversion and processing module 5.
Described Optical Sampling clock generator 1 output sampling rate is 1/T, comprise M wavelength time m-wavelength-interleaved linearly polarized light sampling clock.In Polarization Modulation module 2, by regulating Polarization Controller (PC:Polarizationcontroller) 2-1, the input Optical Sampling clock of linear polarization is made to enter electro-optic phase modulator 2-2(as lithium niobate electro-optic phase modulator or high speed light polarization modulator with the polarization direction meeting equation (1)) (see figure 2).The electric signal be sampled is loaded on electro-optic phase modulator 2-2 through the electrical interface of electro-optic phase modulator 2-2 and carries out phase-modulation respectively to the two bundle orthogonal polarized light beams that polarization state in the Optical Sampling clock of process is parallel to electro-optic phase modulator 2-2 two main shaft respectively.Wave decomposing multiplexer is adopted in optics demultiplexing module 3(the present embodiment) utilize Wave Decomposition multiplex technique that the Optical Sampling pulse train of carrying sample information is divided into the pulse train that M road sampling rate is 1/T/M, and send into an input channel (a corresponding wavelength of passage) of polarization demultiplexing module 4 respectively.In any one passage of polarization demultiplexing module 4, the main shaft of polarization beam apparatus (PBS:polarizationbeamsplitter) 4-1 on each passage and the main shaft of electro-optic phase modulator 2-2 (or 135 ° or 225 ° or 315 ° of angles) at 45 °, as shown in Figure 2.After each polarization beam apparatus 4-1, carry polarization state in the Optical Sampling pulse train of electric signal be parallel to respectively electro-optic phase modulator two main shafts two bundle crossed polarized lights be all divided into the orhtogonal linear polarizaiton light pulse sequence (see figure 2) that two bundle polarization states are parallel and perpendicular to polarization beam apparatus 4-1 main shaft respectively, output to two ports of polarization beam apparatus 4-1 respectively.In rear end opto-electronic conversion and processing module 5, each road of polarization beam apparatus 4-1 exports and is all converted to electric signal respectively by photodetector (PD:photondetector) 5-1, electric analog to digital converter (ADC) 5-2 being 1/T/M through a sampling rate is again quantified as digital signal, and inputs data processing module 5-3.First data processing module 5-3 utilizes formula (2) to utilize the digitized result of the corresponding sampled point of the input date restoring of same polarization beam apparatus; Then, then by the data compound of all passages, the whole digitized result being sampled signal is obtained.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. based on a High-precision optical analog-digital converter for phase-modulator, comprise successively: Optical Sampling clock generating module (1), electric light phase modulation module (2), optics demultiplexing module (3), polarization demultiplexing module (4) and opto-electronic conversion and processing module (5); It is characterized in that, described electric light phase modulation module utilizes electro-optic phase modulator to realize sampling to high-speed electrical signals, and from the Optical Sampling pulse of Optical Sampling clock generating module with the angle theta of a main shaft of polarization direction and electro-optic phase modulator
1satisfy condition: γ cos θ
1+ sin θ
1=0 or γ cos θ
1-sin θ
1=0, this main shaft is designated as X ' axle, and another main shaft is designated as Y ' axle, and wherein, γ is light field along phase place electrooptic modulator X ' direction of principal axis polarization and the ratio of the light field along electro-optic phase modulator Y ' direction of principal axis polarization through the gain coefficient of phase-modulator.
2. High-precision optical analog-digital converter according to claim 1, it is characterized in that, described Optical Sampling clock generating module adopts spectrum cutting techniques, Optical Time Division Multiplexing Technology, multiple-wavelength laser or multi-laser synthetic method to produce the Optical Sampling clock of low jitter, linear polarization, the light pulse sequence of multi-wavelength, or the light pulse sequence of co-wavelength.
3. High-precision optical analog-digital converter according to claim 1, is characterized in that, what electro-optic phase modulator exported by described optics demultiplexing module (3) carry the Optical Sampling pulse train being sampled signal is decomposed into multiple parallel channel.
4. High-precision optical analog-digital converter according to claim 1, it is characterized in that, described polarization demultiplexing module (4) comprises multiple polarization beam apparatus (4-1), an output channel of the corresponding optics demultiplexing module of each polarization beam apparatus, the main shaft of each polarization beam apparatus and the main shaft of described electro-optic phase modulator (2-2) is at 45 ° or 135 ° or 225 ° or 315 ° of angles.
5. High-precision optical analog-digital converter according to claim 1, it is characterized in that, described opto-electronic conversion and processing module (5) comprise multiple input channel, one tunnel of a polarization beam apparatus (4-1) of each polarization demultiplexing module (4) described in input channel correspondence exports, each input channel there are a photoelectric commutator (5-1) and an electric analog to digital converter (5-2), for converting light signal to electric signal and being quantized into digital signal, data processing unit (5-3) subsequently carries out data processing, utilize the two-way from same polarization beam apparatus to export and obtain the digitized result that corresponding sampled point is sampled signal, then, again by the digitized result compound of all passages, obtain the final digitized result being sampled signal.
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| CN103809346B (en) * | 2014-02-26 | 2016-07-06 | 上海交通大学 | A kind of ultra high-speed optical mathematic(al) module conversion equipment |
| CN103905179B (en) * | 2014-04-11 | 2015-03-11 | 北京理工大学 | Method and device for dynamically adjusting phase of electric trigger clock |
| CN104296884B (en) * | 2014-10-22 | 2017-12-12 | 上海交通大学 | The multichannel nonmatched measurement method and metrophia compensation device of ultra high-speed optical sampling clock |
| CN106444215B (en) * | 2016-08-30 | 2019-02-01 | 上海交通大学 | The configurable optical analog to digital conversion device of frequency response |
| CN107317650B (en) * | 2017-07-03 | 2019-04-19 | 华南师范大学 | Device, method and system for time-division division multiplex fibre-optic communication wave experimental teaching |
| CN108375861B (en) * | 2018-04-14 | 2020-01-03 | 上海交通大学 | High-speed high-precision optical analog-to-digital conversion device and method capable of realizing intelligent signal processing |
| CN112311467B (en) | 2019-07-26 | 2022-08-09 | 华为技术有限公司 | Signal processing apparatus and signal processing method |
| CN113359369B (en) * | 2021-05-11 | 2023-11-14 | 上海交通大学 | High-frequency anti-aliasing band-pass adjustable light analog-to-digital conversion device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718944A (en) * | 2009-12-29 | 2010-06-02 | 上海交通大学 | Multi-wavelength space-division optical analog-digital converter |
| CN101771491A (en) * | 2008-12-30 | 2010-07-07 | 华为技术有限公司 | Method for polarization multiplexing and demultiplexing, device and system thereof |
| CN102208948A (en) * | 2011-06-01 | 2011-10-05 | 北京邮电大学 | Front-end device for digital radio frequency receiver, receiver and front-end receiving method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771491A (en) * | 2008-12-30 | 2010-07-07 | 华为技术有限公司 | Method for polarization multiplexing and demultiplexing, device and system thereof |
| CN101718944A (en) * | 2009-12-29 | 2010-06-02 | 上海交通大学 | Multi-wavelength space-division optical analog-digital converter |
| CN102208948A (en) * | 2011-06-01 | 2011-10-05 | 北京邮电大学 | Front-end device for digital radio frequency receiver, receiver and front-end receiving method |
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