CN103488023A - High-precision optical analog-digital converter - Google Patents
High-precision optical analog-digital converter Download PDFInfo
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- CN103488023A CN103488023A CN201310429079.5A CN201310429079A CN103488023A CN 103488023 A CN103488023 A CN 103488023A CN 201310429079 A CN201310429079 A CN 201310429079A CN 103488023 A CN103488023 A CN 103488023A
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Abstract
A high-precision optical analog-digital converter sequentially comprises an optical sampling clock generation module, an electro-optic phase modulation module, an optical demultiplexing module, a polarization demultiplexing module and an optic-electro converting and processing module. Polarization modulation and polarization interference based on phase modulators and synthesizing of cross-polarization signals transmitted in the same link are used to realize high linearity optical analog-digital conversion. Due to the fact that the two paths of cross-polarization signals are always transmitted in the same link before reaching a polarization beam splitter, external environment influence on the signals is small, and symmetry can be guaranteed easily. Compared with schemes based on electro-optic intensity modulators, the converter is low in insertion loss and cost and wide in bandwidth.
Description
Technical field
The present invention relates to the optical information processing technology, specifically a kind of high-precision optical analog to digital converter.
Background technology
Development along with digital technology, become digital signal by analog signal conversion, then transmitted, store, process and show and become inevitable trend.Electricity analog to digital converter (EADC:Electronic Analog to Digital Converter) is due to the impact of " electronic bottleneck " such as be subject to that the shake of electric sampling clock, comparer be fuzzy, and performance further improves and faces very large challenge.Optical analog-to-digital converter (PADC:Photonic Analog to Digital Converter) utilizes the Optical Sampling pulse of high stable, the high speed of photonics, the advantage in broadband to realize the digitizing of high speed, broadband signal, can break through electronic bottleneck, be a kind of effective way that realizes 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 proposed at present 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, and J.C.Twichell, Optical Sampling For High-Speed, High-Resolution Analog-To-Digital Converters, International Topical Meeting on Microwave Photonics, 2003.) and the light ADC based on over-sampling realize high-speed, high precision sampling (Shoop, Barry L.Das, Pankaj, Litynski, Daniel, Photonic analog to digital conversion based on temporal and spatial oversampling techniques, US Patent 6529150, 2003.) etc.Just can exchange high-precision resolution for because oversampling technique needs very high over-sampling rate (more than 100), seriously limit the sampling rate of system.Optical analog to digital conversion based on phase encoding is by utilizing the complementarity of dual-port signal, can effectively suppress Optical Sampling clock changes in amplitude that intensity of light source shake etc. causes and the impact of bias point drift, significantly improves the quantified precision of optical analog-to-digital converter.Simultaneously, this scheme can realize high sampling rate in conjunction with time-division or wavelength-division multiplex technique.What at present, the optical analog to digital conversion based on phase encoding adopted is the electric light intensity modulator of dual-port.In order to guarantee the high complementarity of two port outputs of electric light intensity modulator, require two arms of electric light intensity modulator that high symmetry is arranged, and high extinction ratio.Manufacture craft is proposed to very high requirement.Existing commercial dual-port electric light intensity modulator can't be supported the requirement of high precision optical analog to digital conversion.In addition, the dual-port electric light 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 to digital converter based on electro-optic phase modulator (PM:phase modulator).This optical analog-to-digital converter adopts phase modulation technique, the high linear restoring of complementary type by the two-way orthogonal polarization signals is sampled wideband electrical signal, eliminate the impact with external condition (especially temperature) drift of Optical Sampling clock changes in amplitude and traditional intensity modulated direct current biasing point, will significantly improve the quantified precision of optical analog-to-digital converter.
Technical solution of the present invention is as follows:
A kind of high-precision optical analog to digital converter comprises successively: Optical Sampling clock generating module, electric light phase-modulation module, optics demultiplexing module, polarization demultiplexing module, opto-electronic conversion and processing module.
Described Optical Sampling clock generating module is for generation of the Optical Sampling clock of high-repetition-rate, low jitter, linear polarization, the light pulse sequence of m-wavelength-interleaved while being, or the light pulse sequence of co-wavelength.The method realized can adopt but to be not limited to compose cutting techniques, Optical Time Division Multiplexing Technology, multiple-wavelength laser, multi-laser synthetic.
Described electric light phase-modulation module utilizes electro-optic phase modulator to realize the sampling to high-speed electrical signals.Take the main shaft (as describing for simplicity, be designated as X ' axle, another main shaft is designated as Y ' axle) of polarization direction and phase-modulator from the Optical Sampling pulse of Optical Sampling clock generating module and become angle theta
1enter phase-modulator, resolve into the two-way polarization direction polarized light parallel with two main shafts of electro-optic phase modulator (X ', Y ') respectively, sampled 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 passes through the ratio of the gain coefficient of phase-modulator along the light field of phase place electrooptic modulator X ' direction of principal axis polarization and the light field along electro-optic phase modulator Y ' direction of principal axis polarization.To a given phase-modulator, γ is a fixing value.Regulate the angle theta between the main shaft of the polarization direction of input Optical Sampling pulse and phase-modulator 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, and two crossed polarized lights through electro-optic phase modulator are carried out to phase-modulation.Phase-modulator is output as the two-way phase place and carries the polarized orthogonal light pulse sequence that is sampled signal.
It is a plurality of low-speed parallel passages that described optics demultiplexing module will be carried the high-speed light sampling pulse Series Decomposition that is sampled signal message from electro-optic phase modulator.The feature of the Optical Sampling clock of exporting according to Optical Sampling clock generating module, the optics demultiplexing can adopt corresponding Wave Decomposition multiplex technique or light time decomposition multiplex technology etc. to realize.
Described polarization demultiplexing module comprises a plurality of polarization beam apparatus, an output channel of the corresponding optics demultiplexing module of each polarization beam apparatus.The main shaft of the main shaft of each polarization beam apparatus and electric light phase-modulation at 45 ° or 135 ° or 225 ° or 315 ° of angles.Each polarization beam apparatus output two-way polarization direction is parallel and perpendicular to respectively the crossed polarized light of the main shaft (X) of polarization beam apparatus.
Described opto-electronic conversion and processing module comprise a plurality of input channels, a road output of the corresponding polarization beam apparatus of each input channel.A photoelectric commutator and an electric analog to digital converter are arranged, for light signal being converted to electric signal and being quantized into digital signal on each input channel.Data processing unit subsequently utilizes formula (2) will be sampled from the corresponding sampled point of the synthetic acquisition of two-way output signal of same polarization beam apparatus the digitized result of signal, then, again that the digitized result of all passages is compound, obtain the final digitized result that is 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 crossed polarized light of electro-optic phase modulator two major axes orientations through the phase differential after electro-optic phase modulator and be sampled the conversion coefficient 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, can determine by system calibrating.
In high-precision optical analog to digital converter of the present invention, adopt electro-optic phase modulator as the electro optic sampling door, utilize polarization interference to obtain 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, guaranteed the linearity that system is high on principle.Simultaneously, because the two-way of same polarization beam apparatus is exported light intensity I
x, I
yin same ratio, with input Optical Sampling clock, change, the sampled signal recovered according to equation (2) is irrelevant with the intensity of input Optical Sampling clock, has eliminated the impact of input Optical Sampling clock relative intensity shake, for the realization of high linear system provides assurance.
Based on above technical characterstic, the present invention has the following advantages:
1, adopt Polarization Modulation and polarization interference technology, synthesizing of the orthogonal polarization signals that utilization is transmitted in same link, realize high linear optical mode number conversion.Because the two-way orthogonal polarization signals was transmitted all the time before arriving polarization beam apparatus in same link, therefore, be subject to the impact of external environment little, more easily guarantee symmetry.
2, adopt general high speed electro-optical phase-modulator, insertion loss, cost low (than the electric light intensity modulator), be with roomy, there is the good linearity in very large modulation range, make system can realize high linear, high bandwidth simultaneously;
3, the angle between only need independently control/adjustment input polarization state direction, polarization beam apparatus main shaft and phase-modulator main shaft, can make system export required orthogonal polarization signals, thereby high linear restoring is sampled signal.
The accompanying drawing explanation
The system chart of Fig. 1 high-precision optical analog to digital converter of the present invention.
Fig. 2 is Optical Sampling pulse polarization state change procedure schematic diagram of the present invention.
Embodiment
Provide a most preferred embodiment of the present invention below in conjunction with accompanying drawing.This most preferred embodiment be take technical scheme of the present invention and is implemented as prerequisite, provided detailed embodiment and process, but protection scope of the present invention is not limited to following embodiment.
In this most preferred embodiment, take the Optical Sampling clock as the time m-wavelength mapping the Optical Sampling clock be example.As shown in Figure 1, the high-precision optical analog to digital converter of the present embodiment based on phase-modulator, 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 the time m-wavelength-interleaved the linearly polarized light sampling clock.In Polarization Modulation module 2, by regulating Polarization Controller (PC:Polarization controller) 2-1, make the input Optical Sampling clock of linear polarization enter electro-optic phase modulator 2-2(as lithium niobate electro-optic phase modulator or high speed light polarization modulator with the polarization direction that meets equation (1)) (see figure 2).The electric signal be sampled through the electrical interface of electro-optic phase modulator 2-2 be loaded into electro-optic phase modulator 2-2 upper to the Optical Sampling clock of process in the polarization state two bundle orthogonal polarized light beams that are parallel to respectively electro-optic phase modulator 2-2 two main shafts carry out respectively phase-modulation.Adopting Wave decomposing multiplexer in optics demultiplexing module 3(the present embodiment) the Optical Sampling pulse train of utilizing the Wave Decomposition multiplex technique will carry sample information is divided into the pulse train that M road sampling rate is 1/T/M, and sends into respectively an input channel (a corresponding wavelength of passage) of polarization demultiplexing module 4.In any one passage of polarization demultiplexing module 4, polarization beam apparatus on each passage (the PBS:polarization beam splitter) main shaft of 4-1 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 the two bundle crossed polarized lights that polarization state in the Optical Sampling pulse train of electric signal is parallel to respectively two main shafts of electro-optic phase modulator and all be divided into the orhtogonal linear polarizaiton light pulse sequence (see figure 2) that two bundle polarization states are parallel and perpendicular to respectively polarization beam apparatus 4-1 main shaft, output to respectively two ports of polarization beam apparatus 4-1.In rear end opto-electronic conversion and processing module 5, each road output of polarization beam apparatus 4-1 all is converted to electric signal by a photodetector (PD:photon detector) 5-1 respectively, electric analog to digital converter (ADC) 5-2 that is 1/T/M through a sampling rate again is quantified as digital signal, and input data processing module 5-3.At first data processing module 5-3 utilizes formula (2) to utilize the input data of same polarization beam apparatus to recover the digitized result of corresponding sampled point; Then, then the data of all passages are compound, obtain the whole digitized result that is sampled signal.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. the high-precision optical analog to digital converter based on phase-modulator, is characterized in that comprising 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).
2. high-precision optical analog to 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 to digital converter according to claim 1, it is characterized in that, described electric light phase-modulation module utilizes electro-optic phase modulator to realize the sampling to high-speed electrical signals, and from the Optical Sampling pulse of Optical Sampling clock generating module the angle theta with 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, wherein, γ passes through the ratio of the gain coefficient of phase-modulator along the light field of phase place electrooptic modulator X ' direction of principal axis polarization and the light field along electro-optic phase modulator Y ' direction of principal axis polarization.
4. high-precision optical analog to digital converter according to claim 1, is characterized in that, described optics demultiplexing module (3) is decomposed into a plurality of parallel channels by the Optical Sampling pulse train that is sampled signal of carrying of electro-optic phase modulator output.
5. high-precision optical analog to digital converter according to claim 1, it is characterized in that, described polarization demultiplexing module (4) comprises a plurality of polarization beam apparatus (4-1), an output channel of the corresponding optics demultiplexing module of each polarization beam apparatus, the main shaft of the main shaft of each polarization beam apparatus and described electro-optic phase modulator (2-2) at 45 ° or 135 ° or 225 ° or 315 ° of angles.
6. high-precision optical analog to digital converter according to claim 1, it is characterized in that, described opto-electronic conversion and processing module (5) comprise a plurality of input channels, one tunnel output of a polarization beam apparatus (4-1) of the corresponding described polarization demultiplexing module of each input channel (4), a photoelectric commutator (5-1) and an electric analog to digital converter (5-2) are arranged on each input channel, for light signal is converted to electric signal and is quantized into digital signal, data processing unit subsequently (5-3) carries out the data processing, be used to obtain from the two-way output of same polarization beam apparatus the digitized result that corresponding sampled point is sampled signal, then, again that the digitized result of all passages is compound, acquisition is sampled the final digitized result of signal.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809346A (en) * | 2014-02-26 | 2014-05-21 | 上海交通大学 | Ultra high-speed optical analog-to-digital conversion device |
| CN103905179A (en) * | 2014-04-11 | 2014-07-02 | 北京理工大学 | Method and device for dynamically adjusting phase of electric trigger clock |
| CN104296884A (en) * | 2014-10-22 | 2015-01-21 | 上海交通大学 | Multi-channel mismatch measurement method and measurement compensation device for superspeed light sampling clock |
| CN106444215A (en) * | 2016-08-30 | 2017-02-22 | 上海交通大学 | Optical analog-digital converter with configurable frequency response |
| CN107317650A (en) * | 2017-07-03 | 2017-11-03 | 华南师范大学 | Device, method and system for time-division division multiplex fibre-optic communication wave experimental teaching |
| CN108375861A (en) * | 2018-04-14 | 2018-08-07 | 上海交通大学 | The high-speed, high precision optical analog to digital conversion device and method of intelligent signal processing can be achieved |
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Citations (4)
| 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 |
| JP2012070051A (en) * | 2010-09-21 | 2012-04-05 | Nec Corp | Coherent optical receiver and method for controlling the same |
-
2013
- 2013-09-18 CN CN201310429079.5A patent/CN103488023B/en active Active
Patent Citations (4)
| 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 |
| JP2012070051A (en) * | 2010-09-21 | 2012-04-05 | Nec Corp | Coherent optical receiver and method for controlling the same |
| 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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| CN103809346A (en) * | 2014-02-26 | 2014-05-21 | 上海交通大学 | Ultra high-speed optical analog-to-digital conversion device |
| CN103905179A (en) * | 2014-04-11 | 2014-07-02 | 北京理工大学 | Method and device for dynamically adjusting phase of electric trigger clock |
| 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 |
| CN104296884A (en) * | 2014-10-22 | 2015-01-21 | 上海交通大学 | Multi-channel mismatch measurement method and measurement compensation device for superspeed light 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 |
| CN106444215A (en) * | 2016-08-30 | 2017-02-22 | 上海交通大学 | Optical analog-digital converter with configurable frequency response |
| CN107317650A (en) * | 2017-07-03 | 2017-11-03 | 华南师范大学 | Device, method and system for time-division division multiplex fibre-optic communication wave experimental teaching |
| 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 |
| CN108375861A (en) * | 2018-04-14 | 2018-08-07 | 上海交通大学 | The high-speed, high precision optical analog to digital conversion device and method of intelligent signal processing can be achieved |
| WO2021017516A1 (en) * | 2019-07-26 | 2021-02-04 | 华为技术有限公司 | Signal processing device and signal processing method |
| US11700064B2 (en) | 2019-07-26 | 2023-07-11 | Huawei Technologies Co., Ltd. | Signal processing apparatus and signal processing method |
| CN113359369A (en) * | 2021-05-11 | 2021-09-07 | 上海交通大学 | High-frequency anti-aliasing band-pass adjustable optical analog-to-digital conversion device |
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