多泵浦反向激励的拉曼光纤放大器的实现

在拉曼光纤放大器理论建模的基础上,设计并制作了四波长八泵浦反向激励且带宽为90nm的光纤放大器。利用康宁公司生产的25kmSMF作为增益光纤,得到拉曼增益为(11.5±1)dB。采用在不同泵浦情况下实测得到的信号增益系数谱和泵浦之间的增益系数谱,使理论建模得到的拉曼增益与实测相一致。     

正向抽运光纤喇曼放大器偏振相关增益研究

为了研究单抽运多信号传输的光纤喇曼放大器(FRA)系统中各因素对由抽运-信号喇曼相互作用所产生的偏振相关增益(PDG)的影响,采用数值计算的方法,对FRA的数学模型和PDG的表示方法进行了分析,然后对光纤偏振模色散(PMD)、抽运光功率、抽运光波长、信号光功率、光纤长度、光纤损耗等参量与PDG的关系进行了研究,最后总结了各参量对PDG的影响。结果表明,光纤的PMD值对PDG的影响最为显著。此研究对有效降低FRA系统中由非线性效应所造成的PDG是有帮助的。     

同向抽运光纤拉曼放大器功率转换效率的理论分析

为了对同向抽运光纤拉曼放大器的功率转换效率进行研究,由耦合方程出发,首先理论推导出功率转换效率的解析解,然后采用数值计算的方法详细分析不同物理因素对功率转换效率的影响。结果表明：功率转换效率先随着光纤长度和单位面积的拉曼增益系数增加而增加,当增加到最大值时保持数值不变;小信号时,初始信号光功率对功率转换效率的影响较小;大信号时,功率转换效率随着初始信号光功率增加而快速增加;功率转换效率和初始抽运光功率呈抛物线曲线关系;抽运光与信号光的频率比增加时,功率转换效率减小。     

正向抽运喇曼光纤放大器开关增益数值计算研究

采用数值计算的方法,对影响正向抽运喇曼光纤放大器(RFA)开关增益的几个因素——喇曼增益系数、抽运光功率、光纤长度、光纤损耗、有效纤芯面积等参数与正向抽运喇曼光纤放大器开关增益的关系进行了分析研究,并把数值分析的结果和小信号的解析结果进行了比较,然后在此基础上提出了有效提高正向抽运喇曼光纤放大器开关增益的几种方法。     

有限脉宽脉冲泵浦下FRA中的走离和脉冲展宽

采用分步傅里叶算法数值求解非线性薛定谔方程组,模拟出有限脉宽脉冲泵浦下喇曼光纤放大器(FRA)中信号光的传输情况,研究了色散引起的走离效应和脉冲展宽对FRA的影响.结果表明:在有限脉宽脉冲泵浦的情况下,走离效应和脉冲展宽同时影响着FRA的最大作用距离和信号光幅度,当走离量较大时,走离效应对FRA的影响比脉冲展宽更明显,并且泵浦脉宽越小越易受到它的限制.     

Comparison of EDFA and bidirectionally pumped Raman amplifier in a40-Gb/s RZ transmission system

We numerically compare the performance of a bidirectionally pumped Raman and an erbium-doped fiber amplifier (EDFA) system in a 40-Gb/s dispersion-managed return-to-zero (RZ) transmission. The Raman amplifier system shows a substantially higher Q-value compared to that of the EDFA     

Externally pumped millimeter-wave Josephson-junction parametric amplifier

A unified theory of the singly and doubly degenerate Josephson-junction parametric amplifier is presented. Experiments with single junctions on both amplifier modes at frequencies 10, 35, and 70 GHz are discussed. Low-noise temperature (∼100 K, single sideband (SSB)) and reasonable gain (∼8 dB) were obtained at 35 GHz in the singly degenerate mode. On the basis of the theory and experiments, a general procedure for optimizing junction parameters is discussed and illustrated by the specific design of a 100-GHz amplifier.     

Simultaneous amplification of wavelength-division-multiplexed signals by a highly efficient fibre Raman amplifier pumped by high-power semiconductor lasers

We describe the first operation of a high-power semiconductor-laser pumped fibre Raman amplifier (FRA) using high-Raman-gain optical fibre in the 1.5?m region. A high optical gain of 5 dB for 60mW of pump power is obtained. We have also achieved simultaneous amplification of wavelength-division-multiplexed signals by the FRA.     

Threshold level and gain of forward stimulated Brillouin scattering in a forward pumped s-band discrete DCF fibers Raman amplifier

Recently,with fast developing of extra-capacity of fi-ber communication experi mental systems ,dense wave-length division multiplexing (DWDM) technology hasbeen adopted widely[1-3].Now,1300 nmband and 1550nmband have been connected with each other to be a…     

光纤喇曼放大器的发展与应用

首先介绍了光纤喇曼放大器的发展情况和原理结构,与掺铒光纤放大器相比,指出光纤喇曼放大器的优点,然后在三种不同环境下,对混合FRA/EDFA放大与EDFA单独放大这前后两种放大技术的QoS性能进行了比较,最后介绍了FRA在SDH、CATV、WDM和企业存储网络中的应用.     

Dual wavelength modelocked fiber laser

A dual wavelength actively modelocked erbium-doped fiber laser was constructed which generated pulses approximately 50 ps long with repetition rate 2.6 GHz at both 1544.1 nm and 1545.7 nm. The laser cavity incorporated a pair of dispersive gratings to produce temporal-spectral multiplexing of the pulses in the gain medium, which was observed to reduce cross-saturation effects.     

一种准分子激光泵浦的微微秒染料激光脉冲放大器

本文叙述一种在一个泵浦周期内讯号脉冲三次通过染料池的微微秒激光脉冲放大器,它有效地利用泵浦能量,可以得到4×10~4的高增益,低的放大自发荧光以及没有脉冲变宽,并且结构简单,工作稳定。用四能级分子模型,以及作速率方程的数值解,对放大器的特性做了计算机模拟。计算与实验结果相符。     

Efficient erbium-doped fibre amplifier pumped at 820 nm

The highest gain coefficients of 0.86 dB/mW at 1.552 mu m and 0.72 dB/mW at 1.534 mu m are realised at a pumping wavelength of 822 nm by using an erbium-doped fibre with a relative refractive index difference as high as 1.67%, a low intrinsic loss, and an erbium ion concentration of 210 p.p.m. The gains at 1.552 mu m reach 25 and 30 dB for launched pump powers of 30 and 40 mW, respectively.<>     

LD泵浦皮秒激光脉冲再生放大器

为获得更大的脉冲能量和更高的峰值功率,常需要再生放大器将弱脉冲进行高效放大,本文对LD泵浦的皮秒激光再生放大器进行了分析和实验研究,利用SESAM锁模皮秒激光脉冲作为种子源,成功地研制出了放大倍数达106倍的皮秒再生放大器,脉冲重复频率分别为50Hz和5kI-Iz.     

光纤喇曼放大技术及其应用

概述了光纤喇曼放大器的发展情况、分布式喇曼放大器的原理和特性 ,重点阐述了掺铒光纤放大器与喇曼放大技术的组合应用 ;最后指出 ,这两种技术的组合应用能明显提高长距离光纤通信系统性能 ,使掺铒光纤放大器具有更广阔的应用前景。     

光纤拉曼放大器的分析和设计

介绍了光纤拉曼放大器（FRA）的理论模型及其简化模型，在些基础上分析比较了3种前向FRA的仿真方法，给出了忽略泵浦消耗的后向泵浦FRA的解析解，并推导出了前向泵浦和后向FRA的作用距离的表达式，以及双向泵浦FRA的最大无中继传输距离的表达式。     

Simultaneous operation of a Raman fiber amplifier and laser pumped by a dual-wavelength Nd/sup 3+/-doped fiber laser

This paper presents an experimental study on the dynamics of Raman fiber lasers that use highly GeO/sub 2/-doped fibers as an active medium and a dual-wavelength (1060 and 1090 nm) Nd/sup 3+/-doped fiber laser as a pump source. The 1090-nm pump wavelength is located within the SiO/sub 2/ Raman gain spectrum relating to the 1060-nm pump wavelength, and competition is observed between Raman amplification of the 1090-nm emission with the 1060-nm emission used as the pump source and Raman lasing, which is independent of the 1090-nm amplification and which is also uses the 1060-nm emission as the pump source. Several pump configurations have been demonstrated to generate specific Stokes emissions generated through Raman lasing or amplification. Changing the gain-to-loss ratio by introducing intracavity loss of Raman emissions or increasing the Raman fiber length within each configuration can force either Raman amplification or lasing to dominate. The maximum slope efficiency as a function of the launched pump power was /spl sim/55% with a total output power of 1.6 W produced. A red shift of both the pump and the Stokes wavelengths is experimentally observed when the launched diode pump power is scaled up.     

高功率皮秒激光泵浦受激拉曼散射腔研究

为了获得高平均功率的皮秒宽谱段激光,同时 减小整个光学系统的体积,本文从理论和实验两方面研究了高功率皮秒激光泵浦受激拉曼 散射(SRS)振荡腔。 通过分析SRS过程中同时发生的物理过程,将高功率泵浦下的拉曼晶体内多种 非线性效应简化 为晶体在简单等效透镜下的SRS,并通过实验测量单通SRS光的发散角,计算得到了高 功率泵浦下的拉曼晶体等效透镜的曲率半径,在此基础上设计了稳定高效的SRS振荡腔,通 过对比实验验证了此拉曼振荡腔的高效性,实现了波段覆盖532～698nm、最高输出功率为1.32W的皮秒SRS同轴激光的输出。在相同波 段覆盖范围内,是已报道的最高平均输出功率。     

Low-threshold synchronously pumped all-fiber ring Raman laser

Experimental results on a synchronously pumped, all single-mode fiber Raman laser with a low threshold of 740 mW are reported. Suppression of gain fluctuations due to pump phase noise has been achieved by implementing a fiber coupler of high multiplexing effect. Multistokes generation of low-noise optical pulse trains atlambda = 1.12 mum andlambda = 1.18 mum has also been obtained with a subwatt pump threshold.     

Broadband high-gain dispersion compensating Raman amplifier

A Raman gain module compensating for both loss and dispersion of a 40 km standard telecommunication fibre span over the 1510-1565 nm band is reported. The optimised configuration ensures a low signal-spontaneous noise figure and negligible double-Rayleigh scattering noise. The high-gain margin of the amplifier makes it applicable for compensation of an 80 km span