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Amplification Effect on Rayleigh Scattering and SBS in 25 km Distributed Fiber Raman Amplifier 被引量:1
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作者 Hua-Ping Gong Zai-Xuan Zhang 《Journal of Electronic Science and Technology of China》 2008年第4期408-411,共4页
The amplification effect on stimulated Brillouin scattering (SBS) and Rayleigh scattering in the backward pumped G652 fibers Raman amplifier have been researched. The signal source is a tunable narrow spectral bandw... The amplification effect on stimulated Brillouin scattering (SBS) and Rayleigh scattering in the backward pumped G652 fibers Raman amplifier have been researched. The signal source is a tunable narrow spectral bandwidth (〈10 MHz) ECL laser and is pumped by the tunable power 1427.2 nm fiber Raman laser. The Rayleigh scattering lines are amplified by fiber Raman amplifier, and Stokes stimulated Brillouin scattering lines are amplified by fiber Raman amplifier and fiber Brillouin amplifier. The SBS lines total gain is a production of the gain of Raman and the gain of Brillouin amplifier. In experiment, the gain of SBS is about 42 dB and the saturation gain of 25 Ion G652 backward FRA is about 25 dB, so the gain of fiber Brillouin amplifier is about 17 dB. 展开更多
关键词 Brillouin scattering distributed fiber raman amplifier fiber BriUouin amplifier Rayleigh scattering.
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Effect of stimulated Brillouin scattering on the gain saturation of distributed fiber Raman amplifier and its suppression by phase modulation
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作者 张一弛 陈伟 +1 位作者 孙世林 孟洲 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第9期261-266,共6页
For distributed fiber Raman amplifiers(DFRAs), stimulated Brillouin scattering(SBS) can deplete the pump once occurring and consequently generate gain saturation. On the basis of such a theory, theoretical gain sa... For distributed fiber Raman amplifiers(DFRAs), stimulated Brillouin scattering(SBS) can deplete the pump once occurring and consequently generate gain saturation. On the basis of such a theory, theoretical gain saturation powers in DFRAs with various pump schemes are obtained by calculating SBS thresholds in them, and the experimental results show that they are in excellent agreement with the calculation results. The saturation power of the DFRA with a 300 m W forward pump is as low as 0 d Bm, which needs to be enhanced by phase modulation, and the effect is quantitatively studied. A simple model taking both modulation frequency and index into consideration is presented by introducing a correction factor to evaluate the effect of phase modulation on the enhancement of saturation power. Experimentally, it is shown that such a correction factor decreases as the modulation frequency increases and approaches zero when the modulation frequency becomes high enough. In particular, a phase modulation with a modulation frequency of 100 MHz and a modulation index of 1.380 can enhance the saturation power by 4.44 d B, and the correction factor is 0.25 d B, in which the modulation frequency is high enough. Additionally, the factor is 1.767 d B for the modulation frequency of 25 MHz. On this basis,phase modulations with various indexes and a fixed frequency of 25 MHz are adopted to verify the modified model, and the results are positive. To obtain the highest gain saturation power, the model is referable. The research results provide a guide for the design of practical DFRAs. 展开更多
关键词 distributed fiber raman amplifiers gain saturation stimulated Brillouin scattering phase modulation
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Theoretical Analysis of Rayleigh Backscattering Noise in Fiber Raman Amplifiers
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作者 SHENG Zhao-Xia 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第5X期908-910,共3页
In this paper, a new theoretical model for Rayleigh backscattering (RB) analysis of fiber Raman amplifiers is proposed. The model includes all the interactions among the pumps, signals, and all orders of RB. The resul... In this paper, a new theoretical model for Rayleigh backscattering (RB) analysis of fiber Raman amplifiers is proposed. The model includes all the interactions among the pumps, signals, and all orders of RB. The results show that the higher order RB has a negligible influence on the performance of the amplifier. The co-propagating and counterpropagating RB power of the signal grow quadratically with the net-gain of the amplifier. The signal to double Rayleigh backscattering noise ratio (OSNRDRB ) of backward-pumped FRAs is better than that of the forward-pumped ones at high net-gain level (> 13 dB), while at low net-gain level the OSNRDrb of the forward-pumped FRAs is slightly better than that of the backward-pumped ones. 展开更多
关键词 fiber raman amplifier Rayleigh scattering
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An improved calculation method for fiber Raman amplifier equations with multi-wavelength pumping 被引量:3
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作者 常建华 张明德 孙小菡 《Chinese Optics Letters》 SCIE EI CAS CSCD 2004年第8期441-444,共4页
A novel numerical method for fiber Raman amplifier (FRA) from standard propagation equations is presented and derived based on the one-step method for ordinary differential equation (ODE). The proposed algorithm is ef... A novel numerical method for fiber Raman amplifier (FRA) from standard propagation equations is presented and derived based on the one-step method for ordinary differential equation (ODE). The proposed algorithm is effective in solving FRA equations including all the interactions among pumps, signals, and noises. Applications of the numerical analysis to practical FRA-based systems show a great reduction in computation time in comparison with the average power method and the fourth-order Runge-Kutta (RK) method, under the same condition. Also the proposed method can decrease the computing time over three orders of magnitude with excellent accuracy promises in comparison with the direct integration method. 展开更多
关键词 LENGTH FRA An improved calculation method for fiber raman amplifier equations with multi-wavelength pumping
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A novel control method for on-off gain and gain tilt of fiber Raman amplifiers
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作者 冯雪 张巍 +1 位作者 刘小明 彭江得 《Chinese Optics Letters》 SCIE EI CAS CSCD 2004年第4期196-199,共4页
Considering spectrum tilt due to signal-to-signal Raman scattering (SSRS) in backward distributed fiber Raman amplifiers (B-DFRA),an inverse tilted on-off gain profile is adopted to achieve flat net gain.A simple appr... Considering spectrum tilt due to signal-to-signal Raman scattering (SSRS) in backward distributed fiber Raman amplifiers (B-DFRA),an inverse tilted on-off gain profile is adopted to achieve flat net gain.A simple approximate linear relationship of pump power at each wavelength versus on-off gain level and tilt was derived numerically and experimentally so that a novel control method was established.Since there are only 3 pre-determinable constants required for individual pump wave,it is easy to be realized.As an example,maximum errors less than 0.2 and 0.4 dB respectively for average gain and gain tilt were achieved over C+L band in 100-km back-pumped standard single-mode fiber (SMF) experimentally. 展开更多
关键词 PSRS A novel control method for on-off gain and gain tilt of fiber raman amplifiers
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Raman Suppression in a Kilowatt Narrow-Band Fiber Amplifier 被引量:1
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作者 胡曼 杨依枫 +7 位作者 郑也 刘广柏 王建华 刘恺 陈晓龙 赵纯 何兵 周军 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第4期56-59,共4页
A novel technique to suppress stimulated Raman scattering in a high power narrow-band fiber amplifier is reported. By seeding with a comSination of a broadband amplified spontaneous emission seed and a narrowband mast... A novel technique to suppress stimulated Raman scattering in a high power narrow-band fiber amplifier is reported. By seeding with a comSination of a broadband amplified spontaneous emission seed and a narrowband master oscillator seed, the Raman Stokes components can be reduced about 16dB at a total output power of i kW. Ratnan suppression results are depicted in a different wavelengths seeding case and the same wavelength seeding ease, respectively, with different seed power ratios. 展开更多
关键词 of in SRS raman Suppression in a Kilowatt Narrow-Band fiber amplifier FWM PLMA ASE is
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Evolution of modes in double-clad Raman fiber amplifier
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作者 王文亮 黄良金 +2 位作者 冷进勇 郭少锋 姜宗福 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第2期307-311,共5页
Stimulated Raman scattering in a double cladding optical fiber is studied with a continuous wave laser used as a pump source. Under various launch conditions, pump modes are differently excited. Considering the mode c... Stimulated Raman scattering in a double cladding optical fiber is studied with a continuous wave laser used as a pump source. Under various launch conditions, pump modes are differently excited. Considering the mode coupling effect among the pump modes, the evolution of the power in the Stokes modes is studied. The results show that the scattered waves (the Stokes waves) in the fiber core with 9%tm diameter and 0.14 NA could propagate predominantly in the fundamental mode of the fiber by carefully adjusting the pump light launching conditions. 展开更多
关键词 fiber nonlinear optics high power raman fiber amplifier fiber mode
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Low-Threshold Broadband Spectrum Generation by Amplification of Cascaded Stimulated Raman Scattering in an Ytterbium-Doped Fiber Amplifier
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作者 雷成敏 宋锐 +1 位作者 靳爱军 侯静 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第7期59-62,共4页
We present an experimental study on low-threshold broadband spectrum generation mainly due to the amplirfication of the cascaded stimulated Raman scattering (SRS) effect in a four-stage fiber master oscillator power... We present an experimental study on low-threshold broadband spectrum generation mainly due to the amplirfication of the cascaded stimulated Raman scattering (SRS) effect in a four-stage fiber master oscillator power amplifier system. The cascaded SRS is achieved by using a long passive fiber pumped by a pulsed fiber laser cen: tered at wavelength 1064 nm. The amplified spontaneous emission during the amplification process is efficiently suppressed by cutting the length of the passive fiber and by using a double-clad ytterbium-doped fiber amplifier. The generated broadband spectrum spans from 960nm to 1700nm with maximum average output 13.6 W and average spectral power density approximately 17. 7 mW/nm. 展开更多
关键词 Low-Threshold Broadband Spectrum Generation by Amplification of Cascaded Stimulated raman Scattering in an Ytterbium-Doped fiber amplifier SRS
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Influence of double Rayleigh backscatter in CATV systems with Raman amplifiers
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作者 王春华 李力 +1 位作者 王佳世 范为杰 《Journal of Shanghai University(English Edition)》 CAS 2011年第1期49-53,共5页
The double Rayleigh backscatter (DRB) effect in long distance CATV systems using fiber Raman amplifiers (FRAs) is investigated theoretically in the paper. As a comparison, performance of a system with erbium doped... The double Rayleigh backscatter (DRB) effect in long distance CATV systems using fiber Raman amplifiers (FRAs) is investigated theoretically in the paper. As a comparison, performance of a system with erbium doped fiber amplifier (EDFA) is also evaluated. According to the simulation results, it is found that, in case of FRA, the increase of carrier-to-noise ratio (CNR) due to the DRB effect will not impair the performance more than that using EDFA. 展开更多
关键词 fiber raman amplifier (FRA) double Rayleigh backscatter (DRB) carrier-to-noise ratio (CNR)
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Gain Flattened Raman Fiber Amplifier Using Parameter Optimization and DCF Fiber
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作者 Shien-Kuei Liaw Jy-Wang Liaw 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期493-494,共2页
We investigate two configurations of Raman fiber amplifier in the 1530-1570 nm region. The gain spectrum variation is decreased from 8.31 dB to 2.48 dB when appropriately adjust the individual two pumps and optical fi... We investigate two configurations of Raman fiber amplifier in the 1530-1570 nm region. The gain spectrum variation is decreased from 8.31 dB to 2.48 dB when appropriately adjust the individual two pumps and optical fiber. 展开更多
关键词 DCF on be as nm than Gain Flattened raman fiber amplifier Using Parameter Optimization and DCF fiber RFA that
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Investigation of Fiber Design for Discrete Raman Amplifiers
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作者 Yuki Taniguchi Atsushi Oguri +2 位作者 Ryuichi Sugizaki Yoshihiro Emori Takeshi Yagi 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期33-34,共2页
Aeff,R and gR of the optical fibers for discrete Raman amplifiers are theoretically and experimentally investigated. It is demonstrated that Gaussian approximation is adaptable for Aeff,R of these fibers, and gR does ... Aeff,R and gR of the optical fibers for discrete Raman amplifiers are theoretically and experimentally investigated. It is demonstrated that Gaussian approximation is adaptable for Aeff,R of these fibers, and gR does not depend on only core materials. 展开更多
关键词 for on ET in of Investigation of fiber Design for Discrete raman amplifiers
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A Low Noise L-band Dispersion-Compensating Hybrid Fiber Amplifier with 1500 nm Raman Pumping
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作者 Hee Sang Chung Wonkyoung Lee Moo-Jung Chu 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期411-412,共2页
This report presents a low noise L-band dispersion-compensating hybrid fiber amplifier with 1500-nm Raman pumping. It describes the pre-stage optimization, Raman pump selection, and possible nonlinearity problems to a... This report presents a low noise L-band dispersion-compensating hybrid fiber amplifier with 1500-nm Raman pumping. It describes the pre-stage optimization, Raman pump selection, and possible nonlinearity problems to achieve a practical low noise L-band optical amplifier. 展开更多
关键词 NM in be of length A Low Noise L-band Dispersion-Compensating Hybrid fiber amplifier with 1500 nm raman Pumping dBm EDF with NF
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On the Mitigation of Polarization Dependency of Distributed Raman Amplifier Gain by Transmission Fiber PMD
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作者 Toshiyuki TOKURA Takashi MIZUOCHI 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期635-636,共2页
We show theoretically and experimentally that Raman PDG can be formulated as a function of the pump light DOP and the transmission fiber PMD. Raman PDG is sufficiently reduced thanks to the inevitable fiber PMD.
关键词 of it in be PDG On the Mitigation of Polarization Dependency of Distributed raman amplifier Gain by Transmission fiber PMD by
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Sodium guide star laser generation by single-pass frequency doubling in a periodically poled near-stoichiometric LiTaO_3 crystal 被引量:2
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作者 YUAN Ye ZHANG Lei +4 位作者 LIU YanHua Lü XinJie ZHAO Gang FENG Yan ZHU ShiNing 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第1期125-128,共4页
We report in this work a continuous wave(CW) narrowband 589 nm light generation for the purpose of laser guide assisted adaptive optics.A 39 mm long 1 mm thick periodically poled near stoichiometric LiTaO3 crystal wit... We report in this work a continuous wave(CW) narrowband 589 nm light generation for the purpose of laser guide assisted adaptive optics.A 39 mm long 1 mm thick periodically poled near stoichiometric LiTaO3 crystal with duty cycle near 50% was fabricated using electrical poling at room temperature and pumped by a Raman fiber amplifier.We tested two temperature control ovens,and a maximum conversion efficiency of about 14.3%,corresponding to 4 W of yellow light with 28 W of fundamental power,and bandwidth less than 0.18 GHz was achieved. 展开更多
关键词 sodium guide star laser periodically poling stoichiometric LiTaO3 raman fiber amplifier frequency conversion
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