CN102830569A - Time-wavelength interleaved optical sampling clock generation device - Google Patents
Time-wavelength interleaved optical sampling clock generation device Download PDFInfo
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- CN102830569A CN102830569A CN201210327689XA CN201210327689A CN102830569A CN 102830569 A CN102830569 A CN 102830569A CN 201210327689X A CN201210327689X A CN 201210327689XA CN 201210327689 A CN201210327689 A CN 201210327689A CN 102830569 A CN102830569 A CN 102830569A
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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 the optical information technical field, specifically is a kind of time wavelength-interleaved gloss appearance clock-generating device.
Background technology
Gloss appearance clock generating is one of nucleus module of full optical signal processing system such as full gloss appearance, optical mode number conversion.The quality of gloss appearance clock is by the homogeneity decision of the shake in recurrent interval and amplitude (light intensity), and directly influences the performance of related system, as having for the optical mode analog-to-digital converting system:
Wherein: ENOB is the significant bit number of optical mode analog-to-digital converting system, σ
MBe the amplitude jitter of gloss appearance clock, σ
jTime jitter for gloss appearance clock.
Gloss appearance clock comprises two kinds of the multi-wavelengths of single wavelength and time wavelength-interleaved.The gloss appearance clock of multi-wavelength is owing to can carry out parallelization through wavelength-division multiplex; Therefore; Full light signal based on the multi-wavelength light sampling clock is handled, like the optical mode number conversion, and can be when realizing that high-speed light is handled; Realization and low speed, the flexible coupling handled of electric signal easily, thereby the optical technology of giving full play to and the technological advantage of electronics.For this reason, produce high performance multi-wavelength light sampling clock and become one of focus of concern.The method of the generation multi-wavelength light sampling clock that has proposed at present comprise method based on a plurality of different wave length mode-locked lasers (A.Yariv, and R.G.M.P.Koumans, " Time interleaved optical sampling for ultra-high speed A/D conversion; " Electron.Lett.34 (21), 2012 – 2013,1998); Method (K.L.Lee, C.Shu, and H.F.Liu based on single multiple-wavelength laser; " 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 the method (T.R.Clark of cutting apart based on spectrum; 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).That is that all right at present is ripe based on the technology of single multiple-wavelength laser, and the quality of output gloss appearance clock, number of wavelengths etc. are still waiting to improve.All the light pulse sequence of the high-quality single wavelength of multichannel need be combined into the multi-wavelength light sampling clock of time wavelength-interleaved based on a plurality of different wave length mode-locked lasers with based on the method that spectrum is cut apart.A.Yariv etc. adopt the branch/plug in wave filter (Add filter) of a plurality of series connection to realize wavelength-division multiplex; And, carry out adjusting (A.Yariv, the and R.G.M.P.Koumans of light pulse intensity and time delay through each mode-locked laser of control; " Time interleaved optical sampling for ultra-high speed A/D conversion; " Electron.Lett.34 (21), 2012 – 2013,1998).Require a plurality of mode-locked lasers to have very high consistance and accurate controllability (repetition frequency, time delay, intensity) in this method.T.R.Clark etc. have proposed a kind of time wavelength-interleaved method (T.R.Clark based on WDM, adjustable optical attenuator, variable optical delay line, faraday rotation mirror (FRM:Faraday rotator mirror) to the method for cutting apart based on spectrum; 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 that comes and goes light path in the influence of variable optical delay line and adjustable attenuator precision doubled.The particularly important is, the controllability of the commercial now adjustable attenuator based on space optics is very poor, is difficult to the degree of regulation that reaches high, complete and, degree of regulation big based on the adjustable attenuator volume of optical fiber can worsen with the increase of service time.In addition, the FRM of a plurality of separations has also increased the complicacy of system in the said method.
Summary of the invention
The objective of the invention is to deficiency, a kind of device of ability generation time wavelength-interleaved multi-wavelength optical sampling clock is provided to prior art.On the basis of adopting wavelength division multiplexer realization multichannel different wave length light pulse sequence wavelength-division multiplex, utilize variable optical delay line to regulate the time-delay of each road light pulse sequence; Utilize Polarization Controller to regulate the polarization direction of each road light pulse, realize the adjusting of each road light pulse intensity through closing analyzer behind the ripple.In this scheme, the combination of Polarization Controller and analyzer can realize high-precision light pulse intensity adjustments, and stable, reliable, easy to operate.Meanwhile; Other module is polarization correlated in all right compensation system of the combination of this Polarization Controller and analyzer; Make device only need adopt unidirectional light path can realize the time wavelength-interleaved of polarization irrelevant, thereby reduce requirement adjustable delay and variable optical attenuation precision.
Technical solution of the present invention is following:
A kind of time wavelength-interleaved optical sampling clock generation device, its characteristics are being that this device comprises parallel multi-wavelength light pulse train generation module, a plurality of variable optical delay line, a plurality of 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 is the positive integer greater than 1; All N road light pulse sequences are respectively successively behind variable optical delay line and Polarization Controller; Carry out the light pulse sequence of the time wavelength-interleaved of time delay spacings such as wavelength-division multiplex one-tenth again through wavelength division multiplexer, after analyzer output.
Described parallel multi-wavelength light pulse train generation module is used to produce the identical linearly polarized light pulse train of multichannel repetition frequency; The corresponding centre wavelength of every road light pulse sequence and a fixing arbitrarily polarization direction, can adopt but be not limited to the spectrum cutting techniques of ultrashort light pulse, the methods such as combination of a plurality of pulsed lasers realize.
One road light pulse sequence of the corresponding parallel multi-wavelength light pulse train generation module output of described variable optical delay line is used to make the gloss appearance pulse train of different passages to produce the time-delay of time interval arrangement according to the rules.
One road light pulse sequence of the corresponding parallel multi-wavelength light pulse train generation module output of described Polarization Controller; Be used for accurately controlling the polarization direction of each road light pulse; Thereby regulate each road light pulse through the light intensity behind the analyzer, the uniform multi-wavelength light sampling clock of generation amplitude.
Described wavelength division multiplexer has the identical port number of light pulse sequence way with the multi-wavelength light pulse train generation module output that walks abreast; And all centre wavelength and the spectrum width with corresponding light pulse sequence is identical with spectrum width for the centre wavelength of its each passage, is used for the light pulse sequence of the different centre wavelengths of multichannel is multiplexed into the gloss appearance clock of time wavelength-interleaved.
Said analyzer is used for the angle according to light pulse polarization direction and analyzer polarization axle, and the control light pulse is through the transmitance T of analyzer.
Wherein, I
In, I
OutBe 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; Polarization Controller through regulating on each parallel light pulse passage changes the polarization direction of every road light pulse and the angle of analyzer polarization axle; Just can realize adjusting, the gloss appearance clock of the uniform time wavelength-interleaved of output amplitude to different centre wavelength light pulse intensity in the multi-wavelength light sampling clock.
Based on above technical characterstic, the present invention has the following advantages:
1, unites the power of regulating each road light through Polarization Controller and analyzer.Compare with the adjustable attenuator of commercialization, degree of regulation is high, and controllability, reliability and stability are better, can significantly improve the amplitude uniformity and the stability of time wavelength-interleaved gloss appearance clock, reduces the difficulty that device is regulated.
But 2, the polarization of other module influence in the combination compensation system of Polarization Controller and analyzer.Therefore, need not adopt expensive polarizer, need not adopt the structure of polarization irrelevant yet, like structure based on faraday rotation mirror, device still less, cost is lower.
3, unidirectional variable optical delay line and the Polarization Controller of once passing through of every road light pulse sequence compared with the two-way structure of passing through, under same gloss appearance clock index request, to the accuracy requirement drop by half of tunable optical delay and variable optical attenuation.
Description of drawings
Fig. 1 is the structural representation of time wavelength-interleaved gloss appearance clock-generating device of the present invention.
Fig. 2 is that time wavelength-interleaved multi-wavelength light sampling clock produces synoptic diagram.
Embodiment
Provide a practical implementation example of the present invention below in conjunction with accompanying drawing.Present embodiment is that prerequisite is implemented with technical scheme of the present invention, provided 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 gloss appearance clock-generating device of the present invention; As shown in the figure; The light pulse sequence of the N route polarization of parallel multi-wavelength light pulse train generating module 1 output shown in Fig. 2 (a); The repetition frequency of every road light pulse sequence is 1/T, and a respectively corresponding different centre wavelength and fixing arbitrarily polarization direction (are that the polarization axle P of polarization direction and the analyzer of each road light pulse sequence has one arbitrarily but the angle theta of fixing
10..., θ
N0).Relative time delay and the polarization direction of each road light pulse between every road are regulated through a variable optical delay line 2 and Polarization Controller 3 respectively in each road of N road light pulse sequence.Through wavelength division multiplexer 4, N road light pulse sequence is multiplexed into the light pulse sequence (seeing Fig. 2 (b) analyzer pre-pulse sequence synoptic diagram) of the time wavelength-interleaved that waits time delay spacing (T/N), and entering analyzer 5.Analyzer 5 is according to the polarization direction of light pulse and the angle (θ of its polarization axle
1..., θ
n) transmitance of decision light pulse through analyzer, time delay spacings such as output, etc. the gloss appearance clock (seeing Fig. 2 (b) analyzer afterpulse sequence synoptic diagram) of time wavelength-interleaved of amplitude.
In practical implementation; In order to reduce variable optical delay line 2 is postponed the requirement of scope; Avoid postponing to adjust the big optical power loss that causes on a large scale; And the volume and the cost that reduce variable optical delay line, the N road light pulse sequence of parallel multi-wavelength light pulse train generating module 1 output will be controlled at (below the 100ps) in certain scope through the intrinsic delay inequality behind the wavelength division multiplexer 4.This can realize through the fiber lengths of each passage of control (between promptly parallel multi-wavelength light pulse train generating module and wavelength division multiplexer 4 output ports).On this basis, accurately adjust the interpulse interval of gloss appearance through each variable optical delay line 2 of regulating on each wavelength channel, the precision of commercial variable optical delay line can be superior to 5fs.In addition, adjust the amplitude of each wavelength light sampling pulse sequence, realize the homogeneity of amplitude through regulating Polarization Controller 3 on each wavelength channel.For fear of influencing each other between time-delay adjusting and amplitude adjusted, select the little variable optical delay line of amplitude dependency as far as possible for use or postpone the little Polarization Controller of correlativity.Be in course of adjustment, can meet the requirements of the time interval and amplitude uniformity through the adjusting that repeatedly approaches repeatedly.
In said process, through the combination of Polarization Controller and analyzer, can realize stablizing, reliable, high-precision light pulse intensity adjustments; But other module is polarization correlated in the compensation system, realizes the time wavelength-interleaved based on the polarization irrelevant of unidirectional light 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 fields such as high-speed wideband signal optical sampling and processing.
Claims (6)
1. 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), a plurality of variable optical delay line (2), a plurality of 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 is the positive integer greater than 1; All N road light pulse sequences are respectively successively behind described variable optical delay line (2) and Polarization Controller (3); Carry out the light pulse sequence that wavelength-division multiplex becomes the time wavelength-interleaved of time delay spacing such as a tunnel through wavelength division multiplexer (4) again, after analyzer (5) output.
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 is used to produce the identical linearly polarized light pulse train of multichannel repetition frequency, the corresponding centre wavelength of every road light pulse sequence and a random polarization direction.
3. time wavelength-interleaved optical sampling clock generation device according to claim 1 is characterized in that, described variable optical delay line is used to make the light pulse sequence of different passages to produce the accurate delay of time interval arrangement according to the rules.
4. time wavelength-interleaved optical sampling clock generation device according to claim 1 is characterized in that described Polarization Controller is used to regulate 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 identical port number of light pulse sequence way with described parallel multi-wavelength light pulse train generation module output; And the centre wavelength of its each passage is all identical with spectrum width with corresponding light pulse sequence centre wavelength with spectrum width, is used for the gloss appearance clock that becomes the time wavelength-interleaved through time-delay with the adjusted multichannel light pulse sequence of polarization wavelength-division multiplex.
6. time wavelength-interleaved optical sampling clock generation device according to claim 1 is characterized in that described analyzer is used for the angle according to the polarization direction of input optical pulse and analyzer polarization axle, and the control light pulse is through the transmitance of this analyzer.
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Cited By (4)
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| CN104092497A (en) * | 2014-07-16 | 2014-10-08 | 电子科技大学 | Optical staticizer based on SLALOM |
| 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 |
| CN104503187A (en) * | 2014-12-30 | 2015-04-08 | 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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| US20030091116A1 (en) * | 2001-11-15 | 2003-05-15 | Hrl Laboratories, Llc | Time-interleaved delta sigma analog to digital modulator |
| US7388535B1 (en) * | 2006-07-20 | 2008-06-17 | Nortel Networks Limited | Digitizing front end for optical receiver |
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| US20030091116A1 (en) * | 2001-11-15 | 2003-05-15 | Hrl Laboratories, Llc | Time-interleaved delta sigma analog to digital modulator |
| US7388535B1 (en) * | 2006-07-20 | 2008-06-17 | Nortel Networks Limited | Digitizing front end for optical receiver |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092497A (en) * | 2014-07-16 | 2014-10-08 | 电子科技大学 | Optical staticizer based on SLALOM |
| CN104092497B (en) * | 2014-07-16 | 2016-06-01 | 电子科技大学 | A kind of light serioparallel exchange device based on SLALOM |
| 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 |
| 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 |
| CN104503187A (en) * | 2014-12-30 | 2015-04-08 | 上海交通大学 | Calibrating and signal correction reconstruction method for time-wavelength interweaving optical analog-to-digital conversion |
| 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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