CN102830569B - Time-wavelength interleaved optical sampling clock generation device - Google Patents
Time-wavelength interleaved optical sampling clock generation device Download PDFInfo
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- CN102830569B CN102830569B CN201210327689.XA CN201210327689A CN102830569B CN 102830569 B CN102830569 B CN 102830569B CN 201210327689 A CN201210327689 A CN 201210327689A CN 102830569 B CN102830569 B CN 102830569B
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Abstract
The invention relates to a time-wavelength interleaved optical sampling clock generation device. The time-wavelength interleaved optical sampling clock generation device comprises a parallel multi-wavelength optical pulse sequence generation module, multiple dimmable delay lines, multiple polarization controllers, a wavelength division multiplexer and a polarization analyzer, wherein the parallel multi-wavelength optical pulse sequence generation module can be used for generating N repeated linearly polarization optical pulse sequences with the same frequency, N is a positive integer which is larger than 1, the N optical pulse sequences can be formed into the optical pulse sequences in equal time delay interval and time-wavelength interleaved optical pulse sequences in equal time delay by being subjected to wavelength division multiplexing through the wavelength division multiplexer after sequentially passing through the dimmable delay lines and the polarization controllers, and the optical pulse sequences can be finally output through the polarization analyzer. The time-wavelength interlacing optical sampling clock generation device disclosed by the invention has the advantages that the regulation accuracy is high, the controllability, the reliability and the stability are better, the amplitude uniformity and the stability of a time-wavelength interleaved optical sampling clock can be obviously increased, and the regulating difficulty of the time-wavelength interleaved optical sampling clock generation device can be reduced.
Description
Technical field
The present invention relates to optical information technology field, specifically a kind of time wavelength-interleaved Optical Sampling clock-generating device.
Background technology
Optical Sampling clock generating is one of nucleus module of the all-optical signal processing system such as full Optical Sampling, optical mode number conversion.The quality of Optical Sampling clock is determined by the shake in recurrent interval and the homogeneity of amplitude (light intensity), and directly affects the performance of related system, as having for optical mode analog-to-digital converting system:
Wherein: ENOB is the effective number of bits of optical mode analog-to-digital converting system, σ
mfor the amplitude jitter of Optical Sampling clock, σ
jfor the time jitter of Optical Sampling clock.
Optical Sampling clock comprises the multi-wavelength two kinds of Single wavelength and time wavelength-interleaved.The Optical Sampling clock of multi-wavelength is owing to can carry out parallelization by wavelength-division multiplex, therefore, based on the all-optical signal processing of multi-wavelength light sampling clock, as optical mode number conversion, can while realizing high-speed light process, realize easily and low speed, the mating of flexible electrical signal transacting, thus give full play to the advantage of optical technology and electronics technologies.For this reason, one of high performance multi-wavelength light sampling clock focus becoming concern is produced.The method of the generation multi-wavelength light sampling clock proposed at present comprises the method (A.Yariv based on multiple different wave length mode-locked laser, and R.G.M.P.Koumans, " Time interleaved optical sampling for ultra-high speed A/D conversion, " Electron.Lett.34 (21), 2012 – 2013, 1998), based on the method (K.L.Lee of single multiple-wavelength laser, C.Shu, and H.F.Liu, " 10 Gsample/s photonic analog-to-digital converter constructed using 10-wavelength jitter-suppressed sampling pulses from a self-seeded laser diode, " CLEO 2001, pp.67 – 68.), and based on the method (T.R.Clark that spectrum is split, J.U.Kang and R.D.Esman, " Performance of a time andwavelengthinterleaved photonic sampler for analog-digital conversion, " IEEE Photon.Tech.Lett., vol.11, 1168 ~ 1169, 1999).Technology based on single multiple-wavelength laser is also immature at present, and the quality, number of wavelengths etc. that export Optical Sampling clock need to improve.The multi-wavelength light sampling clock light pulse sequence of high-quality for multichannel Single wavelength being combined into time wavelength-interleaved is all needed based on multiple different wave length mode-locked laser with based on the method for spectrum segmentation.A.Yariv etc. adopt the wave filter (Add filter) that divides/insert of multiple series connection to realize wavelength-division multiplex, and by controlling each mode-locked laser, carry out the adjustment (A.Yariv of optical pulse intensity and time delay, and R.G.M.P.Koumans, " Time interleaved optical sampling for ultra-high speed A/D conversion; " Electron.Lett.34 (21), 2012 – 2013,1998).Require in the method that multiple mode-locked laser has very high consistance and accurate controllability (repetition frequency, time delay, intensity).T.R.Clark etc. propose a kind of time wavelength deinterleaving method (T.R.Clark based on WDM, adjustable optical attenuator, variable optical delay line, faraday rotation mirror (FRM:Faraday rotator mirror) to the method based on spectrum segmentation, J.U.Kang and R.D.Esman, " Performance of a time andwavelengthinterleaved photonic sampler for analog-digital conversion; " IEEE Photon.Tech.Lett., vol.11,1168 ~ 1169,1999).This based on the structure of round light path in the impact of variable optical delay line and adjustable attenuator precision be doubled.The particularly important is, the controllability of the adjustable attenuator based on space optics commercial is now very poor, is difficult to reach high degree of regulation, and, degree of regulation large based on the adjustable attenuator volume of all-fiber can worsen with the increase of service time.In addition, in said method, multiple discrete FRM too increases the complicacy of system.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of device of energy generation time wavelength-interleaved multi-wavelength optical sampling clock is provided.Realize, on the basis of multichannel different wave length light pulse sequence wavelength-division multiplex, utilizing variable optical delay line to regulate the time delay of each road light pulse sequence at employing wavelength division multiplexer; Utilize Polarization Controller to regulate the polarization direction of each road light pulse, realized the adjustment of each road optical pulse intensity by the analyzer after conjunction ripple.In the program, the combination of Polarization Controller and analyzer can realize high-precision optical pulse intensity and regulate, and stable, reliable, easy to operate.Meanwhile, in all right compensation system of combination of this Polarization Controller and analyzer, other module is polarization correlated, make device that unidirectional optical path only need be adopted can to realize the irrelevant time wavelength-interleaved of polarization, thus reduce the requirement to adjustable delay and variable optical attenuation precision.
Technical solution of the present invention is as follows:
A kind of time wavelength-interleaved optical sampling clock generation device, its feature is being, this device comprises parallel multi-wavelength light pulse train generation module, multiple variable optical delay line, multiple Polarization Controller, wavelength division multiplexer and analyzer;
Described parallel multi-wavelength light pulse train generation module produces the identical linearly polarized light pulse train of N road repetition frequency, wherein N be greater than 1 positive integer, all N roads light pulse sequence is respectively successively after variable optical delay line and Polarization Controller, carried out the light pulse sequence of the time wavelength-interleaved of the time delay spacings such as wavelength-division multiplex one-tenth again by wavelength division multiplexer, export finally by analyzer.
Described parallel multi-wavelength light pulse train generation module is for generation of the identical linearly polarized light pulse train of multichannel repetition frequency, the corresponding centre wavelength of every road light pulse sequence and a polarization direction fixed arbitrarily, can adopt but the method such as the spectrum cutting techniques of ultrashort light pulse, the combination of multiple pulsed laser that is not limited to realizes.
The road light pulse sequence that the described parallel multi-wavelength light pulse train generation module of variable optical delay line correspondence exports, for the time delay making the Optical Sampling pulse train of different passage produce time interval arrangement according to the rules.
The road light pulse sequence that the described parallel multi-wavelength light pulse train generation module of Polarization Controller correspondence exports, for accurately controlling the polarization direction of each road light pulse, thus regulate each road light pulse by the light intensity after analyzer, produce the uniform multi-wavelength light sampling clock of amplitude.
Described wavelength division multiplexer has the port number identical with the light pulse sequence way that the multi-wavelength light pulse train generation module that walks abreast exports, and the centre wavelength of its each passage is identical with spectrum width with the centre wavelength of corresponding light pulse sequence with spectrum width, for the light pulse sequence of different for multichannel centre wavelength being multiplexed into the Optical Sampling clock of time wavelength-interleaved.
Described analyzer is used for the angle according to light pulse polarization direction and analyzer polarization axle, controls the transmitance T of light pulse by analyzer.
Wherein, I
in, I
outfor the light intensity of the light pulse of input and output analyzer, θ is the angle of light pulse polarization direction and analyzer polarization axle.Therefore, the polarization direction of every road light pulse and the angle of analyzer polarization axle is changed by regulating the Polarization Controller on each parallel light pulse passage, just can realize the adjustment to centre wavelength optical pulse intensity different in multi-wavelength light sampling clock, the Optical Sampling clock of the uniform time wavelength-interleaved of output amplitude.
Based on above technical characterstic, the present invention has the following advantages:
1, by the power of Polarization Controller and each road light of analyzer combine regulation.Compared with the adjustable attenuator of commercialization, degree of regulation is high, and controllability, reliability and stability are better, can significantly improve amplitude uniformity and the stability of time wavelength-interleaved Optical Sampling clock, reduces the difficulty that device regulates.
2, the combination of Polarization Controller and analyzer can the polarization impact of other module in compensation system.Therefore, do not need to adopt expensive polarizer, also do not need the structure adopting polarization irrelevant, as the structure based on faraday rotation mirror, device is less, and cost is lower.
3, every road light pulse sequence is unidirectional once through variable optical delay line and Polarization Controller, compared with the two-way structure passed through, under same Optical Sampling clock index request, postpones and the accuracy requirement drop by half of variable optical attenuation to tunable optical.
Accompanying drawing explanation
Fig. 1 is the structural representation of time wavelength-interleaved Optical Sampling clock-generating device of the present invention.
Fig. 2 is that time wavelength-interleaved multi-wavelength light sampling clock produces schematic diagram.
Embodiment
Specific embodiment of the present invention is provided below in conjunction with accompanying drawing.The present 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.
Fig. 1 is the structural representation of time wavelength-interleaved Optical Sampling clock-generating device of the present invention, as shown in the figure, parallel multi-wavelength light pulse train generation module 1 exports the light pulse sequence of N route polarization as shown in Figure 2 (a) shows, the repetition frequency of every road light pulse sequence is 1/T, and respectively (namely the polarization direction of each road light pulse sequence and the polarization axle P of analyzer have any but angle theta of fixing a corresponding different centre wavelength and fixing arbitrarily polarization direction
10..., θ
n0).Each road of N road light pulse sequence regulates the polarization direction of relative time delay between every road and each road light pulse respectively through a variable optical delay line 2 and Polarization Controller 3.To be multiplexed into etc. the light pulse sequence (see Fig. 2 (b) analyzer pre-pulse sequence schematic diagram) of the time wavelength-interleaved of time delay spacing (T/N) through wavelength division multiplexer 4, N road light pulse sequence, and to enter analyzer 5.Analyzer 5 is according to the angle (θ of the polarization direction of light pulse and its polarization axle
1..., θ
n) determine that light pulse is by the transmitance of analyzer, the time delay spacings such as output, etc. the Optical Sampling clock (see Fig. 2 (b) analyzer afterpulse sequence diagram) of time wavelength-interleaved of amplitude.
In concrete enforcement, in order to reduce requirement variable optical delay line 2 being postponed to scope, avoid postponing on a large scale to adjust the large optical power loss caused, and reducing volume and the cost of variable optical delay line, the intrinsic delay inequality of N road light pulse sequence after wavelength division multiplexer 4 that parallel multi-wavelength light pulse train generation module 1 exports will control in certain scope (below 100ps).This realizes by the fiber lengths controlling each passage (namely parallel between multi-wavelength light pulse train generation module and wavelength division multiplexer 4 output port).On this basis, by regulating each variable optical delay line 2 on each wavelength channel to come the interpulse interval of accurate adjustment Optical Sampling, the precision of commercial variable optical delay line can be better than 5fs.In addition, by the amplitude regulating the Polarization Controller 3 on each wavelength channel to adjust each wavelength light sampling pulse sequence, the homogeneity of amplitude is realized.In order to avoid influencing each other between delay adjustment and amplitude adjusted, select variable optical delay line that amplitude dependency is little or the little Polarization Controller of delay correlation as far as possible.Be in course of adjustment, by the adjustment that repeatedly repeatedly approaches to meet the requirements of the time interval and amplitude uniformity.
In above process, by the combination of Polarization Controller and analyzer, can realize stablizing, reliable, high-precision optical pulse intensity regulates; And can other module polarization correlated in compensation system, realize based on the irrelevant time wavelength-interleaved of the polarization of unidirectional optical path.Under same adjustable delay and variable optical attenuation precision, obtain higher-quality time wavelength-interleaved multi-wavelength light sampling clock.The present invention can be widely used in the fields such as high-speed wideband signal optical sampling and process.
Claims (5)
1. a time wavelength-interleaved optical sampling clock generation device, it is characterized in that, this device comprises parallel multi-wavelength light pulse train generation module (1), multiple variable optical delay line (2), multiple Polarization Controller (3), wavelength division multiplexer (4) and analyzer (5);
Described parallel multi-wavelength light pulse train generation module (1) produces the identical linearly polarized light pulse train of N road repetition frequency, wherein N be greater than 1 positive integer, described N road light pulse sequence is respectively successively after described variable optical delay line (2) and Polarization Controller (3), carry out by wavelength division multiplexer (4) light pulse sequence that wavelength-division multiplex becomes the time wavelength-interleaved of the time delay spacings such as a road again, export finally by analyzer (5);
Described analyzer is used for according to the polarization direction of input optical pulse and the angle of analyzer polarization axle, controls the transmitance of light pulse by this analyzer.
2. time wavelength-interleaved optical sampling clock generation device according to claim 1, it is characterized in that, described parallel multi-wavelength light pulse train generation module for generation of the identical linearly polarized light pulse train of multichannel repetition frequency, the corresponding centre wavelength of every road light pulse sequence and an arbitrary polarized direction.
3. time wavelength-interleaved optical sampling clock generation device according to claim 1, is characterized in that, the accurate delay of described variable optical delay line for making the light pulse sequence of different passage produce time interval arrangement according to the rules.
4. time wavelength-interleaved optical sampling clock generation device according to claim 1, it is characterized in that, described Polarization Controller is for regulating the polarization direction of each road light pulse.
5. time wavelength-interleaved optical sampling clock generation device according to claim 1, it is characterized in that, described wavelength division multiplexer has the port number identical with the light pulse sequence way that described parallel multi-wavelength light pulse train generation module exports, and the centre wavelength of its each passage is identical with spectrum width with corresponding light pulse sequence centre wavelength with spectrum width, for the Optical Sampling clock by becoming time wavelength-interleaved through the multi-path light pulse train wavelength-division multiplex of time delay after polarization adjustment.
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| 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 |
| CN104503187B (en) * | 2014-12-30 | 2017-04-19 | 上海交通大学 | Calibrating and signal correction reconstruction method for time-wavelength interweaving optical analog-to-digital conversion |
| CN113114249A (en) * | 2021-03-05 | 2021-07-13 | 电子科技大学 | Broadband high-speed optical sampling analog-digital converter implementation device and method |
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| US7388535B1 (en) * | 2006-07-20 | 2008-06-17 | Nortel Networks Limited | Digitizing front end for optical receiver |
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Non-Patent Citations (2)
| Title |
|---|
| Performance of a Time- and Wavelength-Interleaved Photonic Sampler for Analog–Digital Conversion;T. R. Clark et al;《IEEE PHOTONICS TECHNOLOGY LETTERS》;19990930;第11卷(第9期);第1168页左栏第2段到第1169页左栏第2段 * |
| Photonic Time-Stretched Analog-to-Digital Converter Amenable to Continuous-Time Operation Based on Polarization Modulation With Balanced Detection Scheme;Jia Haur Wong et al;《JOURNAL OF LIGHTWAVE TECHNOLOGY》;20111015;第29卷(第20期);第3102页左栏第1段到第3105页右栏第1段 * |
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