共查询到20条相似文献,搜索用时 93 毫秒
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17dBm功率、46dB增益和3.3dB噪声系数的掺铒光纤放大器唐平生刘小明刘丹彭江得范崇澄周炳琨(清华大学电子工程系,北京100084)运转于1.55μm波段的掺铒光纤放大器(EDFA)是光纤通信系统中理想的光放大器,在光纤传输与网络系统中的应用为... 相似文献
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L波段掺铒光纤放大器的自发辐射谱与增益的研究 总被引:4,自引:0,他引:4
利用Giles模型对L波段掺铒光纤放大器小信号增益特性进行了数值模拟,模拟结果表明最佳铒纤长度并不是一定值,它随输入信号波长的不同而改变,较短的波长对应较短的光纤长度;在数值模拟、分析的基础上,分别采用7m和9m的L波段铒光纤构成长波段掺铒光纤放大器,通过实验测量,分析比较了它们的自发辐射谱以及增益和噪声指数,得到了光纤长度对L波段增益谱、噪声指数和自发辐射谱的影响规律;最后,辅以C波段掺铒光纤放大器加以分析,指出了适合于放大L波段信号的最佳自发辐射谱型。 相似文献
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线性啁啾长周期光纤光栅用作EDFA增益平坦滤波器的理论研究 总被引:4,自引:2,他引:2
提出用具有特定折射率调制包络的线性啁啾长周期光纤光栅作为掺铒光纤放大器(EDFA)的增益平坦滤波器.采用龙格库塔迭代法数值求解该类型光栅耦合模方程,就特定的掺铒光纤放大器增益谱,用Nelder-Mead优化算法对光栅结构参量(光栅长度、周期、线性啁啾系数、折射率调制包络的形状等)进行优化,设计出能在C波段35 nm带宽范围内对掺铒光纤放大器进行平坦化(增益起伏在±0.5 dB之内)的平坦滤波器. 相似文献
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小芯径掺铒光纤与单模光纤低损耗接续的研究 总被引:1,自引:1,他引:0
报道了掺铒光纤放大器中降低掺铒光纤与单模光纤接续损耗的一种新方法,采用在芯区直径较小的掺铒光纤端部拉锥的方法,使得掺铒光纤中的传输模场在锥形区域内扩散,从而与单模光纤中直径较大的本征模场良好匹配,实现低损耗接续,初步实验结果表明,该方法可获得小于1dB的接续损耗。 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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介绍了一种基于声光可调谐滤波器(AOTF)的可调谐掺铒光纤激光器。从掺铒光纤放大器的速率方程和传输方程出发,推导出声光可调谐掺铒光纤激光器的输出公式,理论上解释了该环形腔声光可调谐掺铒光纤激光器调谐范围仅决定于掺铒光纤的增益带宽;并在实验中测得该激光器调谐范围为1 526.05 nm到1 560.63 nm,这个区间对应着实验所得掺铒光纤自发辐射谱的增益区间,从而验证了理论推导所得结论。 相似文献
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基于长周期光纤光栅滤波器的掺铒光纤放大器理论和实验研究 总被引:2,自引:2,他引:0
从理论和实验上研究了带有高频二氧化碳激光写入的低成本长周期光纤光栅(LPFG)掺铒光纤放大器(EDFA).结果表明,单波长和多波长EDFA的性能都可以通过在掺铒光纤(EDF)中插入长周期光纤光栅用作自发辐射噪声(ASE)滤波器或增益平坦器来提高性能.优化设计了带LPFG噪声滤波器的线放EDFA,与没有LPFG噪声滤波器相比,线放的噪声和小信号增益分别被减小和提高了约0.5 dB和7 dB。通过在多波长EDFA的EDF中插入一个LPFG增益平坦滤波器的方法,获得了1.5 dB的增益平坦度,与没有LPFG平坦器相比,EDFA的噪声被减小了0.1 dB,增益被提高了1 dB. 相似文献
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带光隔离器的掺铒光纤放大器性能分析 总被引:9,自引:3,他引:6
本文通过速率方程对带光隔离器的掺铒光纤放大器(EDFA)的性能进行了理论分析.由于光隔离器有效地抑制了反向传输的放大自发幅射(ASE),从而改善了掺铒光纤放大器的增益、噪音系数和输出功率等性能,分析结果表明光隔离器加在最佳位置时,可使小信号增益提高约5dB,噪音系数降低约1.6dB. 相似文献
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The effect of injecting conventional band (C-band) amplified spontaneous emission on the performance of long-wavelength band erbium-doped fiber amplifier (L-band EDFA) is demonstrated. It uses a circulator and broadband fiber Bragg grating (FBG) to route C-band ASE from a C-band EDFA. Injection of a small amount of ASE (attenuation of 20 dB or above) improves the small signal gain with a negligible noise figure penalty compared to that of an amplifier without the ASE injection. A maximum gain improvement of 3.5 dB is obtained at an attenuation of 20 dB. At very large amounts of ASE injection (attenuation of 0 dB), the gain of the amplifier is clamped at 15.2 dB from ?40 to ?10 dBm with a gain variation of less than 0.3 dB. The saturation power is also increased from ?8 dBm (for without ASE injection) to 2 dBm (VOA=0 dB) with a slight noise figure penalty. These results show that the ASE injection technique can be used either for gain improvement or for gain clamping in L-band EDFA. 相似文献
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A gain clamping technique for the long wavelength band erbium-doped fiber amplifier (L-band EDFA) is presented. It uses two circulators and a broad band fiber Bragg grating to route wasted backward C-band ASE from the second stage and launch it back into the input end of the first stage of a two-stage amplifier. The two-stage L-band EDFA has shown a small signal gain improvement of 5.7 dB compared to a single-stage amplifier with a slight noise figure degradation. By utilizing the wasted backward ASE, a L-band gain-clamped EDFA with high gain can be realized. Compared to the unclamped case, this gain-clamping technique is effective in reducing the total gain variation as small as 0.3 dB. 相似文献
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Sun Hyok Chang Jin Soo Han Hee Sang Chung Kwangjoon Kim Je Soo Ko 《Optics Communications》2006,261(2):269-275
The characteristics of hybrid fiber amplifier (HFA) are investigated. HFA is composed of three stages: short-length EDFA pre-stage, DCF Raman amplifier, and power boosting EDFA. HFA has low noise figure, high output power, and also wide input power dynamic range. Gain control method of HFA is presented experimentally, and the transient gain excursion is suppressed to less than 0.5 dB at 3 dB channel add-drop. HFA can be used as line amplifier in optical transmission link even combined with distributed Raman amplifier due to wide input power dynamic range. The transmission performance of HFA is better than EDFA by more than 1.0 dB of Q-factor in 720 km SMF transmission. 相似文献
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有源循环式光脉冲复制系统的输出特性研究 总被引:1,自引:0,他引:1
改进并验证了一种基于有源循环光纤延迟线的模拟光脉冲信号复制技术.实验系统采用低增益掺铒光纤放大器补偿循环损耗.进行了光脉冲信号复制的仿真和实验,在掺铒光纤放大器增益为6.774 dB,光滤波器-3 dB,带宽为0.8 nm时,测得第500个复制光脉冲的信噪比为31 dB.仿真和实验结果表明,选用小增益掺铒光纤放大器可以实现低于3 dB的噪音系数,降低掺铒光纤放大器的放大自发辐射噪音并提高输出脉冲序列的信噪比,有望成为提高光脉冲复制器性能的一种新方法.在系统中插入窄带光滤波器等手段也是改善信噪比的有效措施. 相似文献
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An erbium-doped fiber amplifier (EDFA) is simulated. The variation of gain with different parameters is obtained and the values of these parameters are optimized to achieve a maximum value of gain. A two-stage gain-flattened EDFA consisting of two EDFAs in series is also simulated. In the operating range of 1565-1610 nm, the flat gain of 46 dB is obtained. 相似文献
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Two designs of long-wavelength band erbium-doped fiber amplifier (L-band EDFA) for gain clamping in double-pass systems are
demonstrated and compared. The first design is based on ring laser technique where a backward amplified spontaneous emission
(ASE) from the second stage is routed into the feedback loop to create an oscillating laser for gain clamping. The gain is
clamped at 18.6 d B from -40 to -80 dBm with a gain variation of less than ±0.1 dB and a noise figure of less than 6 dB. Another
scheme is based on partial reflection of ASE into the EDFA, which is demonstrated using a narrowband fiber Bragg grating.
This scheme achieves a good gain clamping characteristic up to -12 dBm of input signal power with a gain variation of less
than ±0.3 dB from a clamped gain of 22 dB. The noise figure of a 1580 nm signal is maintained below 5 dB in this amplifier
since this scheme is not based on lasing mechanism. The latter scheme is also expected to be free from the relaxation oscillation
problem. 相似文献