共查询到19条相似文献,搜索用时 125 毫秒
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讨论掺铒光纤的制造技术和掺铒光纤放大器的放大原理。结果表明,掺铒光纤放大器非常适用亍光纤孤子通信系统对光孤子进行放大。 相似文献
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在由分布式掺铒光纤级联的高码率传输系统中存在不可忽略的高阶扰动,它们引起孤子自频率漂移和孤子变形。本文用光相位共轭补偿高阶扰动,结果表明:由分布式掺铒光纤级联的高码率传输系统中,适当选取光相位共轭周期长度,可以完全消除高阶扰动引起的孤子自频率漂移和孤子变形。 相似文献
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针对全光纤的超短脉冲掺铒光纤放大器进行了仿真模拟,对正常色散条件下掺铒光纤自相似脉冲放大过程进行了详细分析。在光纤预放大器中,使用高正色散掺铒光纤对脉冲形状进行预整形,将重复频率43 MHz、脉冲宽度600 fs、平均输出功率1.2 mW的孤子型锁模脉冲预整形为抛物线型脉冲,预整形后的脉冲通过光纤主放大器进行功率放大。经两级光纤放大后,1.2 mW的信号光功率放大为102 mW,放大增益19.3 dB。分析了掺铒光纤长度、放大功率对脉冲自相似演化过程的影响。放大后的脉冲经4.4 m长单模光纤将脉冲宽度压缩至53 fs,峰值功率为44.8 kW。 相似文献
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研究了一种混合掺铒/铒镱共掺光纤放大器,用掺铒光纤放大器作为输入信号的预放大器,用铒镱共掺双包层光纤放大器作为主放大器。掺铒光纤放大器采用20m长掺铒光纤作为增益介质,采用最大输出功率318mW的单模半导体激光器二极管作为泵浦源,预放大器获得的最大输出功率是113mW。铒镱共掺光纤放大器采用14m长铒镱共掺双包层光纤作为增益介质,采用2个915nm多模半导体激光二极管作为泵浦源,在输入信号功率为10mW、信号波长1555nm时,混合光纤放大器获得了最大输出功率为32.04dBm,即1.6W,与此相应的混合光纤放大器的光-光转换效率为18.5%。 相似文献
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光学孤子与全光孤子通信 总被引:1,自引:0,他引:1
光学孤子通信是利用光纤中的非线性效应消除脉冲的色散,提高传输码率,最近因掺铒光纤放大器的发展,将取代Raman放大器而成为光孤子通信系统中最有效的光放大器,使得光孤子通信进入实用阶段。本文对光学孤子的成形机制,性质以及在光纤通信系统中的应用作了深入浅出的介绍。 相似文献
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掺铒光纤环镜中超短光孤子的放大与压缩Ⅰ.基本原理 总被引:2,自引:0,他引:2
用常规掺铒光纤放大器放大超短光孤子存在一个重大困难 ,就是在放大过程中光纤非线性效应会引起孤子波形及频谱畸变 ,使得输出脉冲不再具有孤子特性 ,从而影响系统性能。提出一种利用掺铒光纤环镜放大超短光孤子的新方法 ,数值计算表明 ,该方法不仅可实现无畸变的光孤子放大 ,而且能同时实现孤子宽度的有效压缩。当宽度为 2 ps的基阶孤子经过长度为 92 .6m、增益为 14 .4dB的环镜后 ,其峰值功率被放大 16 5倍 ,脉冲宽度被压缩到 0 .19ps ,时间带宽积为 0 .30 3,脉座能量仅占整个脉冲能量的 3.8% ,表明由环镜输出的放大脉冲很大程度上具有基阶孤子特性。 相似文献
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The gain flattening of the erbium doped fiber amplifier (EDFA) is one of the most important aspects in the EDFA which the gain is wavelength dependent. For the first time the limitation of EDFA gain optimizing for a 32-channel wavelength division multiplexing (WDM) systems is investigated and reported in this paper. In a 32-channel WDM system the most favorable flatness gain achieved was 23.16 ± 1.51 dB with an average noise figure of 5.70 dB. This outcome proposes that the method does not achieve a uniform spectral gain in a 32-channel WDM system that incorporates a bandwidth of around 25 nm. Based on the simulation results the intrinsic optimization of EDFA causes the poor SNR and peak signal power with great variation over a transmission distance of 480 km single mode fiber. 相似文献
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Study on EDFA Gain Tilt and Nonlinear Distortion in an AM-VSB CATV Optical Fiber Transmission System 总被引:3,自引:0,他引:3
1IntroduCtionAMVSB(~litUdemodulationwithvestigialsideband)CATVoPticalfibertrandriSSdrisystemiswidelyaPpliedduetocomplete1ycomatibilitywtthekistingCATVtechntheyandoccuPationaverynarrowband.Theopticalpowerbudgetofthesystemistoollttle(about5~8dBm)toreallzealDngdistancetransndssion,andoPticalmodulationdegreeisalsorestrainedinanarrowrangeinordertOguaranteethenonlinearrequlrementssinceitissensitivetOthenonlineardistortion.EDFAisintroducedintothesystemtoimProvetheopticalpoWrbudget.Indongs… 相似文献
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Study on EDFA Gain Tilt and Nonlinear Distortion in an AM-VSB CATV Optical Fiber Transmission System
The gain tilt of the erbium-doped fiber amplifier (EDFA) and the nonlinear distortion in an AM-VSB CATV optical fiber transmission system with a cascade of EDFAs are analyzed. It demonstrates that the nonlinear distortion induced by the light source and the EDFA would be counteracted each other to a certain degree as long as the EDFA has a negative gain tilt. As a result,an optimal EDFA negative gain tilt is suggested as a solution to self-compensation of the nonlinear distortion. 相似文献
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放大器间距对应用相敏光放大器的平均光孤子系统传输性能影响的研究 总被引:2,自引:2,他引:0
本文采用计算机系统仿真方法,研究了相敏光放大器(PSA) 作为在线放大器时光孤子系统中放大器间距对系统传输性能的影响,研究了平均孤子传输方案.仿真结果表明:当放大器间距与色散距离比值小于0.1时,系统能够保持良好的传输性能;在比值大于0.1情况下,系统的传输性能劣化较快.这是由于PSA增益的相敏特性导致孤子脉冲能量的损失所引起的.采用微调放大器增益的方法能在一定程度上补偿PSA放大导致的孤子能量损失,但这种改善是以增大孤子脉冲旁瓣幅度为代价的. 相似文献
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Shuangmei Xu Hong Li Liang Qiu Xianglin Yang 《International Journal of Infrared and Millimeter Waves》1997,18(6):1375-1380
The model of stochastic nonlinear gain variation is built in the soliton transmission system. The influence of the stochastic
nonlinear gain variation on the soliton transmission system is studied. The results show that the stochastic nonlinear gain
variation apparently leads to the time jitters in arrival, degrades the capacity of soliton transmission system and the filter
can suppress the influence well. 相似文献
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报道了制备Z-切KTPRb/Ba离子交换平面光波导的方法,给出了较理想的Rb和Ba的mol%比,测量了光波导层的光损伤感度和晶格常数变化。实验结果表明:光损伤感度为1.2~2.3×10-10cm2/J,它与掺Ba的含量和热退火工艺无关;晶格常数的变化为0.42~0.25%,它随着掺Ba含量的增加而减少。 相似文献
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A dual-stage erbium doped fiber amplifier (EDFA) having a flat gain wavelength response throughout L-band transmission window is presented. By applying pump power distribution technique, the pump power is distributed to two different stages with different length of EDF depending on the coupling ratio. By controlling these two parameters, gain of 19.1 dB with small gain variation of less than 0.5 dB and a noise figure of less than 10.5 dB are achieved in this architecture using bidirectional pumping. However, when another 3 dB power coupler is added to split the pump power equally at the second stage in bidirectional, a better noise figure of less than 7.5 dB was obtained. Comparison with a conventional single-stage optical amplifier was made in order to validate the performances of this dual-stage EDFA. 相似文献
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Selvadurai Selvakennedy Prabakaran Poopalan Mohd Adzir Mahdi Harith Ahmad 《Optical Review》2000,7(4):294-296
Amplification of multiwavelength signals by an erbium-doped fiber amplifier (EDFA) is becoming critical, due to the proliferation of wavelength division multiplexed systems. However, when a standard EDFA is employed, the dissimilarities among the signals’ gain may prove unacceptable. Thus, a novel gain-clamped EDFA is proposed here to tackle the issue of gain tilt. The suitability of the configuration is then investigated through a numerical model, which is developed based on the standard EDFA and fiber laser models. 相似文献