CN101741004A - SBS technology-based long-service-life broadband optimal pulse memory - Google Patents
SBS technology-based long-service-life broadband optimal pulse memory Download PDFInfo
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- CN101741004A CN101741004A CN200910238121A CN200910238121A CN101741004A CN 101741004 A CN101741004 A CN 101741004A CN 200910238121 A CN200910238121 A CN 200910238121A CN 200910238121 A CN200910238121 A CN 200910238121A CN 101741004 A CN101741004 A CN 101741004A
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Abstract
The invention discloses an SBS technology-based long-service-life broadband optical pulse memory, which belongs to the field of nonlinear optics. The memory utilizes three narrow-band continuous DFB lasers with approximately 1,550 nm output wavelengths to generate read pulses, write pulses and data pulses respectively, and takes sulfur compound glass optical fiber as a storage medium. The data pulses encounter the write pulses in the optical fiber, and the energy of the data pulses is substantially evacuated through a stimulated Brillouin scattering process and is stored in the optical fiber in a form of sound wave. After manual control for a certain time, a read pulse is input into the optical fiber from a direction the same as that of the write pulse, and restores the sound waves into the data pulses comprising information content after interaction with the sound waves. The read pulses and the write pulses are controlled by different lasers respectively and the lasers are modulated through a noise source, so that gains and absorption spectrums of the read and write pulses are controlled and pruned to fulfill the aims of long-service-life broadband optical storage and high reading efficiency.
Description
Technical field
The present invention relates to a kind of optical storage system in nonlinear optical medium, be specially a kind of long-service-life broadband optimal pulse memory, belong to non-linear optical field based on SBS (stimulated Brillouin scattering) technology.
Background technology
At document Zhaoming Zhu, Daniel J.Gauthier, Robert W.Boyd.Stored Light in anOptical Fiber via Stimulated Brillouin Scattering.Science.2007, introduced a kind of optical storage system among the 318:1748-1750, this system is respectively applied for to produce by two the nearly 1550nm of output wavelength continuous DFB in arrowband (Distributed feedback) laser and reads, write and data pulse, read, write pulse is produced by a Distributed Feedback Laser, data pulse is produced by another DFB (distributed feed-back) laser, and storage medium is non-linear monomode fiber.The Brillouin shift of reading and writing pulse and data pulse is 9.6GHz.Reading and writing pulse and data pulse are with MZM modulator (Mach-Zehnder modulators, Mach-Zehnder) modulate respectively and produce behind two continuous Distributed Feedback Lasers in arrowband, the MZM modulator is controlled with pulse generator (pulse pattern generator).Reading and writing pulse that modulation produces through MZM and data pulse use three erbium-doped fiber amplifiers (Erbium-doped fiber amplifiers) to increase peak power respectively.The reading and writing pulse enters 5 meters long non-linear monomode fiber through optical isolator (optical isolators) and optical fiber polarization controller (fiber polarization controllers) back by 3-dB coupler (3-dB coupler).Data pulse is passed through optical isolator and optical fiber polarization controller equally after enter non-linear monomode fiber by another 3-dB coupler from the other end.Whole storing process is: when data pulse is by optical fiber, write pulse is passing through optical fiber with the data pulse rightabout, in non-linear monomode fiber, meet, by the stimulated Brillouin scattering process, the energy of total data pulse is evacuated basically, and be stored in the optical fiber with the form of sound wave, comprised the information content of data pulse in the sound wave.Subsequently, optical fiber is passed through in a read pulse on the direction identical with write pulse, meet with sound wave, Encounter Time can artificially be controlled, and it also is memory time, its sound wave of having found time, data pulse is discharged from optical fiber and recovery, propagate along the direction identical with original data pulse.
The problem and shortage of this technology is:
1. tunable scope memory time little (life-span is short).In above-mentioned report, for the light pulse of given width, along with the growth of memory time, the efficient of reading of data pulse reduces.For the data pulse of 2ns (FWHM, halfwidth), when be 4ns memory time, the efficient of reading of data pulse was 29%.In reading the non-vanishing scope of efficient, be 8ns tunable memory time, approximately is 4 pulse durations.This does not also consider to read efficient when very low, pulse distortion, factors such as can't discerning and can't use.
2. the transmission rate of the storable data pulse of memory is restricted.Although can increase bytes of memory quantity by methods such as use ultrashort pulses in said system, after all in actual applications, there is requirement the duration of pulse, can not be infinitely short, so the byte quantity that can store has been proposed restriction.In addition, in the SBS process, natural brillouin gain live width is tens MHz, so in above-mentioned storage scheme, the optical memory meeting restricting data transmission rate of narrow like this bandwidth differs greatly with existing communication system tens Gb/s message transmission rates to tens Mb/s.
3. it is low to read efficient, and the peak power of required reading and writing pulse is too big.In this optical storage, when the peak power of data pulse was 10mW, the peak power of required reading and writing pulse was 100W.Data pulse is not by storage and release fully, and main cause is, may be that on the other hand, the brillouin gain coefficient of optical fiber is too little because the spectrum width of write pulse is not sufficiently more than the result of data pulse spectrum on the one hand.Also have, for phonon, optical fiber structure is not very reasonable, causes sound wave that big diffraction loss is arranged, and data pulse is had high read efficient and high data fidelity needs very high peak power, and this also is unfavorable for practical application.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of existing optical storage system, proposed a kind of long-service-life broadband optimal pulse memory based on the SBS technology, this storage system has realized the broadband light storage and has obtained the high efficient of reading.
Basic thought of the present invention is as follows:
Reading is to carry out two different tasks, and the task of write pulse is the data pulse of finding time fully, the more data pulse is present in the optical fiber with the form of sound wave, and the task of read pulse is as much as possible all sound waves all to be reverted to data pulse.If carry out different tasks with identical pulse, will inevitably have influence on the raising and the improvement of reading efficient, pulse distortion is difficult to effective control, and then can have influence on the life-span of memory.Reading is respectively with the control of different laser in the present invention, and with noise source laser modulated, thereby to the gain of reading and writing pulse with absorption spectra is controlled and cutting, makes the reading and writing pulse can better fulfil the responsibility of oneself.And replace traditional monomode fiber as nonlinear optical medium with the chalcogenide compound glass optical fiber, because the chalcogenide compound glass optical fiber has long phonon lifetime and big brillouin gain, thereby can guarantee that whole storage system realizes the peak power of long-service-life broadband optical storage and reduction reading and writing pulse.
Technical scheme of the present invention is as follows: comprise first Distributed Feedback Laser 2, first optical isolator 3, the one MZM4, first erbium-doped fiber amplifier 5, first optical fiber polarization controller 6, three-dB coupler 7, second optical fiber polarization controller 8, second erbium-doped fiber amplifier 9, the 2nd MZM11, second optical isolator 13, second Distributed Feedback Laser 14, light circulator 16, variable optical attenuator 17, photo-detector 18, oscilloscope 19, chalcogenide compound glass optical fiber 20, the 3rd MZM21, the 3rd optical isolator 23 and the 3rd Distributed Feedback Laser 24.Wherein:
Write pulse is produced by first Distributed Feedback Laser 2, the write pulse of first Distributed Feedback Laser, 2 outputs is modulated its waveform and frequency in a MZM4 by first optical isolator, 3 backs again, and then successively through being coupled into light circulator 16 by a three-dB coupler 7 after first erbium-doped fiber amplifier 5,6 amplifications of first optical fiber polarization controller, the Polarization Control, light circulator 16 is connecting chalcogenide compound glass optical fiber 20;
Data pulse is the continuous laser that is produced by arrowband the 3rd Distributed Feedback Laser 24, this laser earlier by behind the 3rd optical isolator 23 again by entering chalcogenide compound glass optical fiber 20 behind the 3rd MZM modulator 21, data pulse is met with the write pulse by chalcogenide compound glass optical fiber 20 the other way around in chalcogenide compound glass optical fiber 20, changes into the sound wave form and finishes storage;
Read pulse is produced by second Distributed Feedback Laser 14, modulate with the 2nd MZM11 through second optical isolator, 13 backs, and then successively through second erbium-doped fiber amplifier 9, second optical fiber polarization controller 8 amplify, the other end by three-dB coupler 7 after the Polarization Control is coupled into light circulator 16, read pulse enters chalcogenide compound glass optical fiber 20 and described acoustic wave action read output signal from the direction identical with write pulse; Light circulator 16 links to each other with tunable attenuator 17, photo-detector 18 and oscilloscope 19 again successively, and the signal after the storage is detected;
The wavelength of described first Distributed Feedback Laser 2, second Distributed Feedback Laser 14 and 24 outputs of the 3rd Distributed Feedback Laser is nearly 1550nm.
The present invention adopts three continuous Distributed Feedback Lasers in the nearly 1550nm of output wavelength arrowband to be respectively applied for and produces reading and writing and data pulse, and the Brillouin shift of reading and writing pulse and data pulse is realized by temperature control.Two wideband spectrum sources of reading and writing pulse are to obtain by the injection current of directly modulating the single mode Distributed Feedback Laser with the Gaussian noise source of AWG (Arbitrary Waveform Generator) generation.The variation of injection current has caused the gain medium change of refractive, has therefore caused the variation of laser frequency, and the variation of frequency is directly proportional with the modulated amplitude of electric current.The laser power spectrum that produces like this is approximately Gaussian.The bandwidth of spectrum is to regulate by the voltage that changes noise source.Reading and writing two-way wide range light after three-dB coupler is coupled into chalcogenide compound glass optical fiber (storage medium), produces laser pulse with pulse generator control MZM modulator through the MZM modulators modulate.Modulation signal waveform by the control modulator can ride gain and absorption spectra line style, arrives the time of storage medium by the FREQUENCY CONTROL reading and writing pulse of control modulation signal.Data pulse is directly to produce laser pulse by the continuous laser that the arrowband Distributed Feedback Laser produces by the MZM modulator control.Data pulse and write pulse meet in the chalcogenide compound glass optical fiber, and through the SBS process, data pulse is become sound wave and is stored in the optical fiber.Read pulse is gone into optical fiber and is interacted with sound wave in that certain hour is laggard, and data pulse is resumed.
Beneficial effect of the present invention mainly contains:
One, native system uses two continuous Distributed Feedback Lasers in the nearly 1550nm of output wavelength arrowband to produce the reading and writing pulse respectively.The independent control of reading and writing pulse more helps the gain of reading and writing pulse and the control and the reduction of absorption spectra, make the brillouin gain of reading and writing pulse and absorption spectra line style with data pulse and with the interaction of sound wave in the best effect of performance, to realize the broadband light storage and to obtain the high efficient of reading.
Two, the utilization of chalcogenide compound glass optical fiber can not only increase the adjustable extent of memory time, and the chalcogenide compound glass optical fiber has higher brillouin gain and less fibre core core diameter, can effectively reduce the peak power of reading, improves and reads efficient.
Description of drawings
Fig. 1 is an invention technological system schematic diagram
Among the figure: 1. the first Gaussian noise source, 2. first Distributed Feedback Laser, 3. first optical isolator, 4. a MZM, 5. first erbium-doped fiber amplifier, 6. first optical fiber polarization controller, 7.3dB coupler, 8. second optical fiber polarization controller, 9. second erbium-doped fiber amplifier, 10. second pulse generator, 11. the 2nd MZM, 12. first pulse generators, 13. second optical isolator, 14. second Distributed Feedback Laser, 15. second Gaussian noise sources, 16. light circulators, 17. variable optical attenuator, 18. photo-detector, 19. oscilloscopes, 20. chalcogenide compound glass optical fibers, 21. the 3rd MZM, 22. the 3rd pulse generator, 23. the 3rd optical isolators, 24. the 3rd Distributed Feedback Lasers.
Embodiment
Below in conjunction with Fig. 1 the specific embodiment of the present invention is described in detail:
Long-service-life broadband optimal pulse storage system among the present invention based on the SBS technology, system diagram comprises the first Gaussian noise source 1 referring to figure one, first Distributed Feedback Laser 2, first optical isolator 3, the one MZM4, first pulse generator 12, first erbium-doped fiber amplifier 5, first optical fiber polarization controller 6, three-dB coupler 7, second optical fiber polarization controller 8, second erbium-doped fiber amplifier 9, second pulse generator 10, the 2nd MZM11, second optical isolator 13, second Distributed Feedback Laser 14, the second Gaussian noise source 15, light circulator 16, variable optical attenuator 17, photo-detector 18, oscilloscope 19, chalcogenide compound glass optical fiber 20, the 3rd MZM21, the 3rd pulse generator 22, the 3rd optical isolator 23 and the 3rd Distributed Feedback Laser 24.
The continuous Distributed Feedback Laser 2 in the nearly 1550nm of output wavelength arrowband is used to produce write pulse, and the Brillouin shift of write pulse and data pulse is realized by temperature control.The wideband spectrum source of write pulse is to obtain by the injection current of the Gaussian noise source 1 direct modulation single mode Distributed Feedback Laser that produces with AWG (Arbitrary Waveform Generator).The variation of injection current has caused the gain medium change of refractive, has therefore caused the variation of laser frequency, and the variation of frequency is directly proportional with the modulated amplitude of electric current.The laser power spectrum that produces like this is approximately Gaussian.The bandwidth of spectrum is to regulate by the voltage that changes noise source.The continuous Distributed Feedback Laser 14 in the nearly 1550nm of output wavelength arrowband is used to produce read pulse, and the Brillouin shift of read pulse and data pulse is realized by temperature control.The wideband spectrum source of read pulse is to obtain by the injection current of the Gaussian noise source 15 direct modulation single mode Distributed Feedback Lasers that produce with AWG (Arbitrary Waveform Generator).Reading and writing two-way wide range light is earlier respectively through the 2nd MZM modulator 11 and a MZM modulator 4 modulation, again respectively through second erbium-doped fiber amplifier 9 with first erbium-doped fiber amplifier 5 amplifies after three-dB coupler 7 couplings, enter chalcogenide compound glass optical fiber 20 (storage medium) through light circulator 16 again.Respectively with second pulse generator 10 and first pulse generator, 12 control the 2nd MZM modulators 11 and a MZM modulator 4 generation laser pulses.Modulation signal waveform by controlling the 2nd a MZM modulator 11 and a MZM modulator 4 can ride gain and absorption spectra line style, and the FREQUENCY CONTROL reading and writing pulse of the modulation signal by controlling the 2nd a MZM modulator 11 and a MZM modulator 4 arrives the time of storage medium.The energy of reading and writing and data pulse is respectively to control with second optical fiber polarization controller 8 and first optical fiber polarization controller 6.Data pulse is directly to produce laser pulse by controlling by MZM modulator 21 behind the optical isolator 23 earlier by the continuous laser that arrowband Distributed Feedback Laser 24 produces again, and MZM modulator 21 is by pulse generator 22 controls.The data pulse that produces enters chalcogenide compound glass optical fiber 20.Whole storing process is: when data pulse is by optical fiber, write pulse is passing through optical fiber with the data pulse rightabout, in chalcogenide compound optical fiber 20, meet, this also is the medium of storage light, by the stimulated Brillouin scattering process, the energy of data pulse is evacuated basically, simultaneously, in optical fiber, produce sound wave, comprised the information content of data pulse in the sound wave.Subsequently, chalcogenide compound optical fiber 20 is passed through in a read pulse on the direction identical with write pulse, meet with sound wave, Encounter Time can artificially be controlled, and its sound wave of having found time is discharged data pulse and recovers from optical fiber, propagate along the direction identical with original data pulse, behind variable optical attenuator 17, enter photodetector 18, enter oscilloscope 19 at last.
(1) guarantees the realization that broadband light is stored.If optical memory is used for Fiber Optical Communication System, will with existing communication system tens Gb/s message transmission rate compatibilities.So in SBS slower rays Study on Technology, in the scope of tolerable distortion, people want to have use up various ways, expand the bandwidth of SBS slower rays as far as possible, with the needs of the high data byte for transmission speed that adapts to packet.The research approach of our SBS broadband light storage has been proposed on the basis of absorption and reference former achievements.Can the broadening gain spectral and the bandwidth of absorption spectra with the electric current of the direct modulated laser device with distributed feedback of noise signal, laser behind the broadening is modulated with the Mach-Zehnder modulator again, can control and cutting the shape of gain spectral and absorption spectra by the waveform and the frequency thereof that change modulation signal, thereby on the basis of realizing the broadband light storage, that improves data pulse reads efficient and fidelity.
(2) guarantee to obtain to be in harmonious proportion memory time the high efficiency of reading on a large scale, can realize by the following aspects.
(a) can realize by nonlinear optical medium and the preferred interaction area domain structure (can effectively reduce the acoustic wave diffraction loss) of selecting long phonon lifetime and high brillouin gain coefficient.The chalcogenide compound glass optical fiber has big brillouin gain coefficient, than big two orders of magnitude of brillouin gain of general single mode fiber, and has big phonon lifetime, and be 3 to 4 times of ordinary silicon optical fiber phonon lifetime (approximately being 3.4ns).If use the chalcogenide compound glass optical fiber as storage medium, both can reduce the peak power of reading, can obtain the tunable of memory time again on a large scale.We theoretical study results show, data pulse have adopt under the identical situation of reading efficient chalcogenide compound optical fiber as storage medium than using the monomode fiber can be greatly several times as the tunable range of storage medium stores time.
(b) in the former SBS storage scheme, reading comes from a laser, be identical two pulses, but carrying out two different tasks, the task of write pulse is the data pulse of finding time fully, the more data pulse is present in the optical fiber with the form of sound wave, and the task of read pulse is as much as possible all sound waves all to be reverted to data pulse.Different tasks is carried out in identical pulse, will inevitably have influence on the raising and the improvement of reading efficient, and pulse distortion is difficult to effective control, and then can have influence on the life-span of memory.In our SBS storage scheme, the independent control of reading and writing pulse more helps the gain of reading and writing pulse and the control and the reduction of absorption spectra, make the brillouin gain of reading and writing pulse and absorption spectra line style with data pulse and with the interaction of sound wave in the best effect of performance.
(c) can pass through the rising edge and the trailing edge of control data pulse, read and write pulse, and the methods such as intensity of control data pulse, read and write pulse realize.The peak power that reduces the reading and writing pulse mainly is to realize by the core diameter of brillouin gain that improves nonlinear dielectric and reduction optical fiber.Sulphur systemization and thing glass optical fiber can be used as candidate and take on this important task.Theoretical Calculation shows, the magnitude that the peak power of reading can be reduced to watt.
Above-mentioned instantiation has been described in realization in order to demonstrate the invention.But other variations of the present invention and modification it will be apparent to those skilled in the art that, do not have the essence and any modification/variation in the basic principle scope of disclosure or imitate conversion all to belong to claim protection range of the present invention in the present invention.
Claims (1)
1. based on the long-service-life broadband optimal pulse memory of SBS technology, it is characterized in that: comprise first Distributed Feedback Laser (2), first optical isolator (3), the one MZM (4), first erbium-doped fiber amplifier (5), first optical fiber polarization controller (6), three-dB coupler (7), second optical fiber polarization controller (8), second erbium-doped fiber amplifier (9), the 2nd MZM (11), second optical isolator (13), second Distributed Feedback Laser (14), light circulator (16), variable optical attenuator (1 7), photo-detector (18), oscilloscope (19), chalcogenide compound glass optical fiber (20), the 3rd MZM (21), the 3rd optical isolator (23) and the 3rd Distributed Feedback Laser (24); Wherein:
Write pulse is produced by first Distributed Feedback Laser (2), the write pulse of first Distributed Feedback Laser (2) output is modulated its waveform and frequency in a MZM (4) by first optical isolator (3) back again, and then successively through being coupled into light circulator (1 6) by a three-dB coupler (7) after first erbium-doped fiber amplifier (5), first optical fiber polarization controller (6) amplification, the Polarization Control, light circulator (16) is connecting chalcogenide compound glass optical fiber (20);
Data pulse is the continuous laser that is produced by arrowband the 3rd Distributed Feedback Laser (24), this laser earlier by behind the 3rd optical isolator (23) again by entering chalcogenide compound glass optical fiber (20) behind the 3rd MZM modulator (21), data pulse is met with the write pulse by chalcogenide compound glass optical fiber (20) the other way around in chalcogenide compound glass optical fiber (20), changes into the sound wave form and finishes storage;
Read pulse is produced by second Distributed Feedback Laser (14), modulate with the 2nd MZM (11) through second optical isolator (13) back, and then successively through second erbium-doped fiber amplifier (9), second optical fiber polarization controller (8) amplify, the other end by three-dB coupler (7) after the Polarization Control is coupled into light circulator (16), read pulse enters chalcogenide compound glass optical fiber (20) and described acoustic wave action read output signal from the direction identical with write pulse; Light circulator (16) links to each other with tunable attenuator (17), photo-detector (18) and oscilloscope (19) again successively, and the signal after the storage is detected;
Described first Distributed Feedback Laser (2), second Distributed Feedback Laser (14) and the 3rd Distributed Feedback Laser (24) are tunable laser, and the wavelength of output is 1550nm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617472A (en) * | 2015-02-02 | 2015-05-13 | 中国人民解放军国防科学技术大学 | Brillouin multi-wavelength erbium-doped fiber laser with ultra-narrow linewidth |
| WO2017147125A1 (en) * | 2016-02-23 | 2017-08-31 | Corning Incorporated | Quantum memory systems and quantum repeater systems comprising chalcogenide optical fiber links and methods of storing and releasing photons using the same |
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2009
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617472A (en) * | 2015-02-02 | 2015-05-13 | 中国人民解放军国防科学技术大学 | Brillouin multi-wavelength erbium-doped fiber laser with ultra-narrow linewidth |
| WO2017147125A1 (en) * | 2016-02-23 | 2017-08-31 | Corning Incorporated | Quantum memory systems and quantum repeater systems comprising chalcogenide optical fiber links and methods of storing and releasing photons using the same |
| US10033147B2 (en) | 2016-02-23 | 2018-07-24 | Corning Incorporated | Chalcogenide optical fiber links for quantum communication systems and methods of storing and releasing photons using the same |
| US10505333B2 (en) | 2016-02-23 | 2019-12-10 | Corning Incorporated | Chalcogenide optical fiber links for quantum communication systems and methods of storing and releasing photons using the same |
| TWI728058B (en) * | 2016-02-23 | 2021-05-21 | 美商康寧公司 | Quantum memory systems and quantum repeater systems comprising chalcogenide optical fiber links and methods of storing and releasing photons using the same |
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