CN102223183B - Non-relay optical fiber transmission system and method - Google Patents
Non-relay optical fiber transmission system and method Download PDFInfo
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- CN102223183B CN102223183B CN2011102238453A CN201110223845A CN102223183B CN 102223183 B CN102223183 B CN 102223183B CN 2011102238453 A CN2011102238453 A CN 2011102238453A CN 201110223845 A CN201110223845 A CN 201110223845A CN 102223183 B CN102223183 B CN 102223183B
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Abstract
The invention discloses a non-relay optical fiber transmission system and method. The non-relay optical fiber transmission system comprises the following components that are sequentially connected with one another by transmission optical fibers: an optical transmitter, an optical power amplifier, an optical pulse expander, an optical fiber, a high-power optical fiber amplifier, a chromatic dispersion compensation module, an optical pulse compressor, a remotely-pumped optical preamplifier, a distributive optical fiber Raman amplifier, an optical preamplifier, a nonlinear optical loop mirror and an optical receiver. The remotely-pumped optical preamplifier is connected with a remotely-pumped source; and the distributive optical fiber Raman amplifier mainly consists of a Raman pumping source, a wavelength division multiplexer and an optical signal transmission fiber arranged behind the remotely-pumped optical preamplifier. In the invention, a linear chirped fiber grating is used for carrying out time-domain broadening on picosecond optical pulse; the picosecond optical pulse is amplified by the high-power amplifier and is transmitted in the optical fiber; the reversely arranged linear chirped fiber grating is used for compressing the time-domain expanded pulse and recovering the time-domain expanded pulse as the picoscond pulse, thus obtaining time spread gain, thereby leading the transmission distance of the non-relay optical fiber transmission system to be extended.
Description
Technical field
The present invention relates to the Optical Fiber Transmission field, be specifically related to a kind of non-relay fiber optic transmission system and method.
Background technology
At present, the solution of domestic and international non-relay fiber optic transmission system is for locating to adopt pump EDFA power amplifier far away in distance near the tens of kilometers of transmitter one side (50-70km), locate to adopt pump EDFA light preamplifier far away in distance near receiver one side hundred kilometers (110-140km), and adopt distributed optical fiber Raman amplifier in receiver one side.Need could arrive pump EDFA power amplifier far away through tens of kilometers (50-70km) transmission owing to be positioned at the pump light of transmitter terminal 1480nm wavelength, and in long Distance Transmission process, optical fiber can be subjected to the influence of stimulated Raman scattering effect, and most of energy of its pump light will be transferred on the Raman frequency shift wavelength.Therefore, the solution of present non-relay fiber optic transmission system, its useful 1480nm wavelength pumping light power is very low, makes near the power output of the pump EDFA power amplifier far away of transmitting terminal limited; And the input sensitivity of the pump EDFA light preamplifier far away of close receiving terminal is limited, thereby cause the limited transmission distance between pump EDFA power amplifier far away and the pump EDFA light preamplifier far away, the transmission range of whole non-relay fiber optic transmission system is also limited thereupon.
Summary of the invention
In order to solve the limited transmission distance problem of present non-relay fiber optic transmission system, the present invention proposes a kind of non-relay fiber optic transmission system and method.Gain method when the present invention proposes a kind of expansion of novel concept, and adopt the local high power light power amplifier at transmitter place to replace pump light power amplifier far away, adopt the time domain compress technique of carrying out high power amplification and low-power expansion pulse after the expansion of psec optical pulse time domain, gain when expanding with acquisition can improve the transmission range that has non-relay fiber optic transmission system now greatly.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of non-relay optical fiber transmission method comprises the steps:
Light step of transmitting: user profile is loaded in the light pulse;
The luminous power amplification procedure: the light pulse sequence that will carry user profile is sent into and is carried out the adjustment of light pulse power in the power amplifier;
The preposition amplification procedure of pump light far away: light pulse is sent in the pump light preamplifier far away, made the peak power of light pulse be amplified into a long distance optical fiber and transmit;
Distributed fiber Raman amplification procedure: the light signal that transmits in above-mentioned long-distance optical fiber is further amplified and improve signal to noise ratio;
The preposition amplification procedure of light: preposition image intensifer is sent in light pulse carried out the amplification of light pulse small-signal;
Light-receiving step: optical receiver is sent in light pulse recovered user profile;
Its difference is also to comprise between luminous power amplification procedure and the preposition amplification procedure of pump light far away:
Light pulse spread step: the light pulse after the pulse power adjustment is sent in the light pulse expander that is made of linear chirp optical fiber grating and optical circulator, the linear chrip time domain broadening is carried out in the wide range pulse;
Light filter step: the light pulse sequence of time domain broadening sent into carry out filtering in the optical filter;
The high-power fiber amplification procedure: filtered light pulse sequence is sent into high-power fiber amplifier carry out the light pulse power amplification, the light pulse sequence of this amplification enters a long distance optical fiber as input signal and transmits;
Dispersion compensation step: will send in the dispersion compensation module through the light pulse that the long-distance optical fiber transmission is sent here, dispersion compensation is carried out in light pulse;
The light pulse compression step; Light pulse behind the dispersion compensation is sent in the optical pulse compressor that is made of linear chirp optical fiber grating and optical circulator, carried out the linear chrip time domain compression of light pulse; Above-mentioned optical pulse compressor and light pulse expander adopt identical linear chirp optical fiber grating, but it is when being connected on the corresponding circulator, and the direction of its placement is opposite.
In the such scheme, described high-power fiber amplifier is erbium/ytterbium co-doped fiber amplifier.
In the such scheme, described smooth step of transmitting is specially: send into intensity modulator after producing the repetition light pulse by the Repetition Frequency Laser device, user's light signal is that the signal of telecommunication amplifies rear drive intensity modulator generation user modulated light signal through radio frequency amplifier through light-to-current inversion, and user profile namely is loaded in the light pulse.
In the such scheme, also comprise between the preposition amplification procedure of described light and the light-receiving step: light preamplifier is amplified the back light pulse send in the nonlinear optical loop mirror and carry out the shaping of light pulse, modulate nonlinear optical loop mirror shaping step to the light Kerr nonlinearity effects of light pulse to eliminate in phase place modulation and band cross-phase.
Based on the designed a kind of non-relay fiber optic transmission system of said method, comprise the optical sender, power amplifier, pump light preamplifier far away, distributed optical fiber Raman amplifier, light preamplifier and the optical receiver that are connected successively by Transmission Fibers; Wherein be connected with pump pumping source far away on the pump light preamplifier far away, distributed optical fiber Raman amplifier then mainly is made of the optical signal transmission optical fiber behind raman pump source, wavelength division multiplexer and the pump light preamplifier far away; Its difference is also further to comprise: the light pulse expander, optical filter, high-power fiber amplifier, dispersion compensation module and the optical pulse compressor that are connected successively by Transmission Fibers;
Wherein light pulse expander and optical pulse compressor constitute by a linear chirp optical fiber grating and an optical circulator, linear chirp optical fiber grating is connected on second port of optical circulator, and first port of optical circulator and the 3rd port form input and the output of light pulse expander or optical pulse compressor respectively; Above-mentioned optical pulse compressor and light pulse expander adopt identical linear chirp optical fiber grating, but it is when being connected on the corresponding circulator, and the direction of its placement is opposite;
Power amplifier is connected with the light pulse expander, optical pulse compressor links to each other with pump light preamplifier far away, be provided with a long distance optical fiber between high-power fiber amplifier and the dispersion compensation module, be provided with another long distance optical fiber between pump light preamplifier far away and the distributed optical fiber Raman amplifier.
In the such scheme, described high-power fiber amplifier is erbium/ytterbium co-doped fiber amplifier.
In the such scheme, described optical sender mainly is made up of Repetition Frequency Laser device, intensity modulator and radio frequency amplifier; The input of radio frequency amplifier receives user profile, and the output of the output of radio frequency amplifier and Repetition Frequency Laser device is connected on 2 inputs of intensity modulator, and the output of intensity modulator is connected with power amplifier.
In order to eliminate the light Kerr nonlinearity effect that occurs in the transmission line, also be serially connected with nonlinear optical loop mirror between the described light preamplifier of such scheme and the optical receiver.
Compared with prior art, the present invention carries out external modulation loading user profile to the wide range psec light impulse source that repetition rate equals the rate of information throughput.The wide range psec light pulse that loads user profile is carried out the time domain expansion through linear chirped fiber grating, and the high-power fiber amplifier through the transmitter place carries out the luminous power amplification then.The light signal power output of amplifying is in the SBS(stimulated Brillouin scattering) and the SRS(stimulated Raman scattering) below the threshold value.Because adopt wide spectrum light source, the SBS threshold value has surpassed the SRS threshold value, so the light signal power output of amplifying is the upper limit with the SRS threshold value.The time domain expansion light signal of this amplification transmits in long-distance optical fiber, carry out dispersion compensation and place the linear chirp optical fiber grating identical with the transmitter place at suitable distance and position, but its placement direction is opposite, after this processing, time domain expansion light pulse is by compression and back psec light pulse again, peak power obtains gain (gaining during expansion) owing to pulsewidth is compressed, corresponding pump light preamplifier far away can be put into farther distance, thereby has realized the extension of non-relay fiber optic transmission system transmission range.Consider the insertion loss (2dB) of optical pulse compressor, gaining when gain can reach the resulting expansion of 24dB, 622Mbit/s speed during resulting expansions of 2.5Gbit/s speed to reach 30dB.Concerning optical fiber (loss 0.20dB/km) G.652,2.5Gbit/s speed can be expanded non-relay apart from 120km, and 622Mbit/s speed can be expanded non-relay apart from 150km; Concerning Pure Silica Core Fiber (loss 0.15dB/km) G.654,2.5Gbit/s speed can be expanded non-relay apart from 160km, and 622Mbit/s speed can be expanded non-relay apart from 200km.In addition, for the light Kerr nonlinearity effect that occurs in the transmission line, the present invention also can adopt full light 2R technology (as nonlinear optical loop mirror technology etc.) that optical pulse waveform is recovered at the receiver place.
Description of drawings
Fig. 1 is light path system schematic diagram of the present invention;
Fig. 2 is a kind of light pulse expander of the present invention schematic diagram;
Fig. 3 is a kind of optical pulse compressor schematic diagram of the present invention.
Embodiment
Referring to Fig. 1, a kind of non-relay fiber optic transmission system of the present invention comprises optical sender, power amplifier, light pulse expander, optical filter, high-power fiber amplifier, dispersion compensation module, optical pulse compressor, pump light preamplifier far away, distributed optical fiber Raman amplifier, light preamplifier, nonlinear optical loop mirror and the optical receiver that is connected successively by Transmission Fibers.Wherein be connected with pump pumping source far away on the pump light preamplifier far away, distributed optical fiber Raman amplifier then mainly is made of the optical signal transmission optical fiber behind raman pump source, wavelength division multiplexer and the pump light preamplifier far away.Described optical sender mainly is made up of Repetition Frequency Laser device, intensity modulator and radio frequency amplifier.The input of radio frequency amplifier receives user profile, and the output of the output of radio frequency amplifier and Repetition Frequency Laser device is connected on 2 inputs of intensity modulator, and the output of intensity modulator is connected with power amplifier.The output of power amplifier connects the light pulse expander, and the output of light pulse expander links to each other with high-power fiber amplifier through optical filter.The output of high-power fiber amplifier links to each other with dispersion compensation module through the first long distance optical fiber.The output of dispersion compensation module connects optical pulse compressor, and the output of optical pulse compressor is connected to one of them input of pump light preamplifier far away.Another input of pump light preamplifier far away links to each other with pump pumping source far away, and the output of pump light preamplifier far away links to each other with an input of wavelength division multiplexer through the second long distance optical fiber.Another input of wavelength division multiplexer connects raman pump source, and the output of wavelength division multiplexer connects light preamplifier.The output of light preamplifier is connected to optical receiver via nonlinear optical loop mirror.
Light pulse expander of the present invention is identical substantially with the optical pulse compressor structure.Wherein the light pulse expander is made of a linear chirp optical fiber grating and an optical circulator, linear chirp optical fiber grating is connected on second port of optical circulator, and first port of optical circulator and the 3rd port form input and the output of light pulse expander respectively.Optical pulse compressor also is made of a linear chirp optical fiber grating and an optical circulator, linear chirp optical fiber grating is connected on second port of optical circulator, and first port of optical circulator and the 3rd port form input and the output of optical pulse compressor respectively.For can be with the light pulse after time domain expansion compression and back picopulse again, above-mentioned optical pulse compressor adopts identical linear chirp optical fiber grating with the light pulse expander, but it is when being connected on the corresponding circulator, and the direction of its placement is opposite.Referring to Fig. 2 and Fig. 3.
In the preferred embodiment of the present invention, selected Repetition Frequency Laser device is mode locked fiber laser.Described power amplifier, pump light preamplifier far away and light preamplifier are all selected erbium-doped fiber amplifier for use; High-power fiber amplifier is then selected erbium/ytterbium co-doped fiber amplifier for use.
The non-relay optical fiber transmission method that adopts above-mentioned non-relay fiber optic transmission system to realize comprises the steps:
Light step of transmitting: user profile is loaded in the light pulse;
The luminous power amplification procedure: the light pulse sequence that will carry user profile is sent into and is carried out the adjustment of light pulse power in the power amplifier;
Light pulse spread step: the light pulse after the pulse power adjustment is sent in the light pulse expander that is made of linear chirp optical fiber grating and optical circulator, the linear chrip time domain broadening is carried out in the wide range pulse;
Light filter step: the light pulse sequence of time domain broadening sent into carry out filtering in the optical filter;
The high-power fiber amplification procedure: filtered light pulse sequence is sent into high-power fiber amplifier carry out the light pulse power amplification, the light pulse sequence of this amplification enters a long distance optical fiber as input signal and transmits;
Dispersion compensation step: will send in the dispersion compensation module through the light pulse that the long-distance optical fiber transmission is sent here, dispersion compensation is carried out in light pulse;
The light pulse compression step; Light pulse behind the dispersion compensation is sent in the optical pulse compressor that is made of linear chirp optical fiber grating and optical circulator, carried out the linear chrip time domain compression of light pulse; Above-mentioned optical pulse compressor and light pulse expander adopt identical linear chirp optical fiber grating, but it is when being connected on the corresponding circulator, and the direction of its placement is opposite.
The preposition amplification procedure of pump light far away: light pulse is sent in the pump light preamplifier far away, made the peak power of light pulse be amplified into a long distance optical fiber and transmit;
Distributed fiber Raman amplification procedure: the light signal that transmits in above-mentioned long-distance optical fiber is further amplified and improve signal to noise ratio;
The preposition amplification procedure of light: preposition image intensifer is sent in light pulse carried out the amplification of light pulse small-signal;
Light-receiving step: optical receiver is sent in light pulse recovered user profile.
Be example with G.654 Pure Silica Core Fiber, 2.5Gbit/s transmission rate below, come the preferred embodiment of the present invention is elaborated:
It is the light pulse of 2.5GHz that the Repetition Frequency Laser device produces repetition, and signal to noise ratio is greater than 50dB, and spectrum 3dB width is about 3.5nm, and pulsewidth is 1ps.This repetition light pulse sequence enters intensity modulator, and user's light signal of 2.5Gbit/s speed is that the signal of telecommunication amplifies rear drive intensity modulator generation user's binary switch keying (OOK) modulated light signal through radio frequency amplifier through light-to-current inversion.User profile namely is loaded on the picopulse of Repetition Frequency Laser.
The picopulse sequence of carrying user profile is carried out the pulse power adjustment through power amplifier, enters the light pulse expander that is made of linear chirp optical fiber grating and circulator the wide range pulse is carried out the linear chrip broadening to nanosecond order.It is that the logical optical filter of band of 0.1nm carries out filtering that the light pulse sequence of time domain broadening enters three dB bandwidth, and output spectral width is 0.1nm, and pulse duration is the light pulse sequence of 400ps.This pulse train enters high-power fiber amplifier that erbium/ytterbium mixes altogether with Pulse Power Magnification.The low-loss big mode field area that the light pulse sequence that amplifies enters first long distance as input signal G.654 optical fiber transmits.Be designed into fiber optical power and be lower than stimulated Raman scattering (SRS) threshold value, to avoid the appearance of SRS effect.Because the spectrum width of light pulse is 0.1nm, is far longer than the brillouin gain bandwidth of stimulated Brillouin scattering (SBS), and the excited Brillouin threshold value is improved greatly, has effectively suppressed the generation of SBS effect.
With dispersion compensation module dispersion compensation is carried out in light pulse after the G.654 Optical Fiber Transmission through the long distance of first section low-loss, the light pulse after the compensation is compressed to the 1ps pulsewidth through optical pulse compressor with the light pulse of 400ps pulsewidth.Gain will embody during the expansion of light pulse here, because optical pulse width has been pressed narrow 400 times, the peak power of light pulse gains in the time of will obtaining the expansion of 26dB, and the peak power of small-signal can be reached more than the input sensitivity of pump light preamplifier far away.
Subsequently, light signal enters pump light preamplifier far away the peak power of picopulse light signal is amplified into the G.654 Optical Fiber Transmission of second section longer distance, and distributed optical fiber Raman amplifier further amplifies and improve signal to noise ratio to the light signal that transmits in second section optical fiber.
After second section Optical Fiber Transmission, because the optical pulse broadening that CHROMATIC DISPERSION IN FIBER OPTICS makes 1ps is to about the 300ps, this pulse duration can be suitable for the Clock Extraction of receiver preferably, so that the data decision of " 1 " and " 0 " bit.Because optical fiber dispersion causes optical pulse broadening and fiber transmission attenuation that the light signal peak power is reduced, the preposition image intensifer of light that light signal enters before the receiver carries out the amplification of light pulse small-signal, carry out the shaping of light pulse through nonlinear optical loop mirror, modulate light Kerr nonlinearity effects to light pulse to eliminate in phase place modulation and band cross-phase.At last, the light pulse after the shaping enters optical receiver and recovers user profile.
Like this, this transmission system adopts picosecond optical pulse broadening and the compress technique of novel concept, gain when obtaining extra expansion, in conjunction with far away pump light preamplifier, distributed optical fiber Raman amplifier and utilize G.654 big mode field area and the low transmission loss characteristic of optical fiber, the non-relay fiber optic transmission system of long distance that can realize adopting optical fiber G.652 to realize.This system has avoided the use of pump EDFA power amplifier far away.
Claims (8)
1. non-relay optical fiber transmission method comprises the steps:
Light step of transmitting: user profile is loaded in the light pulse;
The luminous power amplification procedure: the light pulse sequence that will carry user profile is sent into and is carried out the adjustment of light pulse power in the power amplifier;
The preposition amplification procedure of pump light far away: light pulse is sent in the pump light preamplifier far away, made the peak power of light pulse be amplified into a long distance optical fiber and transmit;
Distributed fiber Raman amplification procedure: the light signal that transmits in above-mentioned long-distance optical fiber is further amplified and improve signal to noise ratio;
The preposition amplification procedure of light: preposition image intensifer is sent in light pulse carried out the amplification of light pulse small-signal;
Light-receiving step: optical receiver is sent in light pulse recovered user profile;
It is characterized in that, between luminous power amplification procedure and the preposition amplification procedure of pump light far away, also comprise:
Light pulse spread step: the light pulse after the pulse power adjustment is sent in the light pulse expander that is made of linear chirp optical fiber grating and optical circulator, the linear chrip time domain broadening is carried out in the wide range pulse;
Light filter step: the light pulse sequence of time domain broadening sent into carry out filtering in the optical filter;
The high-power fiber amplification procedure: filtered light pulse sequence is sent into high-power fiber amplifier carry out the light pulse power amplification, the light pulse sequence of this amplification enters a long distance optical fiber as input signal and transmits;
Dispersion compensation step: will send in the dispersion compensation module through the light pulse that the long-distance optical fiber transmission is sent here, dispersion compensation is carried out in light pulse;
The light pulse compression step; Light pulse behind the dispersion compensation is sent in the optical pulse compressor that is made of linear chirp optical fiber grating and optical circulator, carried out the linear chrip time domain compression of light pulse; Above-mentioned optical pulse compressor and light pulse expander adopt identical linear chirp optical fiber grating, but it is when being connected on the corresponding circulator, and the direction of its placement is opposite.
2. non-relay optical fiber transmission method according to claim 1, it is characterized in that: described high-power fiber amplifier is erbium/ytterbium co-doped fiber amplifier.
3. non-relay optical fiber transmission method according to claim 1 and 2, it is characterized in that, described smooth step of transmitting is specially: send into intensity modulator after producing the repetition light pulse by the Repetition Frequency Laser device, user's light signal is that the signal of telecommunication amplifies rear drive intensity modulator generation user modulated light signal through radio frequency amplifier through light-to-current inversion, and user profile namely is loaded in the light pulse.
4. non-relay optical fiber transmission method according to claim 1 and 2, it is characterized in that, also comprise between the preposition amplification procedure of described light and the light-receiving step: light preamplifier is amplified the back light pulse send in the nonlinear optical loop mirror and carry out the shaping of light pulse, modulate nonlinear optical loop mirror shaping step to the light Kerr nonlinearity effects of light pulse to eliminate in phase place modulation and band cross-phase.
5. a non-relay fiber optic transmission system that utilizes non-relay optical fiber transmission method as claimed in claim 1 to transmit comprises the optical sender, power amplifier, pump light preamplifier far away, distributed optical fiber Raman amplifier, light preamplifier and the optical receiver that are connected successively by Transmission Fibers; Wherein be connected with pump pumping source far away on the pump light preamplifier far away, distributed optical fiber Raman amplifier then mainly is made of the optical signal transmission optical fiber behind raman pump source, wavelength division multiplexer and the pump light preamplifier far away; It is characterized in that also further comprising: the light pulse expander, optical filter, high-power fiber amplifier, dispersion compensation module and the optical pulse compressor that are connected successively by Transmission Fibers;
Wherein light pulse expander and optical pulse compressor constitute by a linear chirp optical fiber grating and an optical circulator, linear chirp optical fiber grating is connected on second port of optical circulator, and first port of optical circulator and the 3rd port form input and the output of light pulse expander or optical pulse compressor respectively; Above-mentioned optical pulse compressor and light pulse expander adopt identical linear chirp optical fiber grating, but it is when being connected on the corresponding circulator, and the direction of its placement is opposite;
Power amplifier is connected with the light pulse expander, optical pulse compressor links to each other with pump light preamplifier far away, be provided with a long distance optical fiber between high-power fiber amplifier and the dispersion compensation module, be provided with another long distance optical fiber between pump light preamplifier far away and the distributed optical fiber Raman amplifier.
6. non-relay fiber optic transmission system according to claim 5, it is characterized in that: described high-power fiber amplifier is erbium/ytterbium co-doped fiber amplifier.
7. according to claim 5 or 6 described non-relay fiber optic transmission systems, it is characterized in that: described optical sender mainly is made up of Repetition Frequency Laser device, intensity modulator and radio frequency amplifier; The input of radio frequency amplifier receives user profile, and the output of the output of radio frequency amplifier and Repetition Frequency Laser device is connected on 2 inputs of intensity modulator, and the output of intensity modulator is connected with power amplifier.
8. according to claim 5 or 6 described non-relay fiber optic transmission systems, it is characterized in that: also be serially connected with nonlinear optical loop mirror between described light preamplifier and the optical receiver.
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| CN102368590A (en) * | 2011-11-29 | 2012-03-07 | 北京航空航天大学 | Control driving system of short pulse laser system |
| CN102707437B (en) * | 2012-06-11 | 2014-06-04 | 天津理工大学 | Light pulse shaper based on double-array fiber grating and working method thereof |
| CN104319611A (en) * | 2014-11-19 | 2015-01-28 | 天津光电通信技术有限公司 | Low-noise remote pump EDFA |
| CN105763247B (en) * | 2014-12-19 | 2018-03-27 | 海思光电子有限公司 | Optical fiber Insertion Loss detection method and device |
| CN105762625B (en) * | 2016-05-13 | 2018-08-21 | 无锡市德科立光电子技术有限公司 | It is a kind of can situ configuration and upgrading amplifier installation |
| CN106961305B (en) * | 2017-04-17 | 2023-05-23 | 中国电子科技集团公司第三十四研究所 | Bypass forward Raman amplification relay-free optical fiber transmission system |
| CN109088671A (en) * | 2018-09-14 | 2018-12-25 | 国网西藏电力有限公司 | One kind is based on the distant pump Er-doped fiber transmission method of chirped bypass and system |
| CN112217564B (en) * | 2019-07-09 | 2022-04-01 | 中国海洋大学 | Pulse position modulation laser communication method based on chirped fiber grating |
| CN111064069B (en) * | 2019-12-29 | 2024-05-28 | 北京工业大学 | All-fiber femtosecond chirped pulse amplification system |
| CN112345060B (en) * | 2020-09-22 | 2022-10-11 | 上海波汇科技有限公司 | DAS system based on far pump amplifier |
| CN112600619B (en) * | 2020-12-02 | 2022-07-01 | 中科长城海洋信息系统有限公司 | Unrepeatered transmission system and method for optical fiber hydrophone array |
| CN115361065A (en) * | 2022-06-20 | 2022-11-18 | 北京邮电大学 | Long-distance unrepeatered optical signal frequency transmission method and system |
| CN115276824B (en) * | 2022-07-26 | 2024-07-09 | 中国人民解放军国防科技大学 | Quantum noise stream encryption transmitter, receiver, communication system and method |
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