共查询到17条相似文献,搜索用时 109 毫秒
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饱和放大情形下光纤参量放大器的增益和带宽特性研究 总被引:2,自引:0,他引:2
利用龙格库塔法数值求解非线性耦合方程,研究了单抽运光纤参量放大器在增益饱和区的增益谱特性.通过比较考虑抽运光损耗与忽略抽运光损耗增益谱的差别,分析了抽运光损耗对增益谱的影响.此外,给出了在饱和放大区,信号光的增益谱与光纤长度、输入信号光功率、抽运光波长与零色散波长偏离之间的关系.发现在饱和放大区,增益的整体水平有所下降,增益谱的可用带宽相对于小信号放大有所减少,增益谱在可用带宽范围内出现了旁瓣.这些结果将对工作在饱和放大区的单抽运光参量放大器的设计提供有益的帮助. 相似文献
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为了抑制输出信号功率的瞬态波动,提出了调理脉冲信号边沿变化方式的思想.通过有限差分法数值模拟四能级模型下的粒子数速率-光功率传输方程组,理论研究了宽带碲基掺铒光纤放大器(Erbium-doped Tellurite-based Fiber Amplifier,EDTFA)对于低频脉冲输入信号的瞬态响应.研究表明,相比具有阶跃上升沿的方波脉冲,选择一个合适的渐变上升沿脉冲信号可以有效地抑制EDTFA输出端信号功率的瞬时上冲幅度.在多信道系统中,选择渐变的信道功率上传和下载方式,可以延缓其余信道输出功率的瞬态响应速度,从而为后续增益箍制技术的实施提供了便利. 相似文献
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《中国光学与应用光学文摘》2006,(3)
TN253 2006032293抑制噪声的宽带碲基掺铒光纤放大器性能分析=Per-formance analysis of broadband EDTFA with noise sup-pression[刊,中]/周亚训(宁波大学信息科学与工程学院.浙江,宁波(315211)) ,陈芬…∥光电工程.—2006 , 33(1) .—59-62 ,76设计了一个带光隔离器的复合型宽带碲基掺铒光纤放大器(EDTFA) ,通过对该结构模型下的速率方程和光功率传输方程的数值模拟,理论研究了EDTFA在插入光隔离器后的性能变化。研究表明,通过插入光隔离器抑制反向传输的放大自发辐射( ASE)噪声,可以有效地改善宽带EDTFA的信号增益和噪声特性… 相似文献
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从理论和实验上研究了基于半导体光放大器的交叉增益型波长转换器的转换特性.实验研究了转换特性与信号调制格式、放大器增益的关系.利用大信号分析模型讨论了消光比、平均功率转换效率和交流转换效率等性能与平均抽运功率、探测功率及放大器增益特性之间的关系.结果表明,交流转换效率能综合消光比和平均功率转换效率两种指标,在转换器性能优化中有重要的作用 交叉增益型波长转换器输入动态范围较小,很难实现对信号调制格式透明 放大器的增益是取得最佳转换性能的关键
关键词: 相似文献
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针对窄带光纤参量放大(FOPA),区别于以往增益谱的大增益斜率区域,研究了FOPA增益谱边带脉冲信号的快慢光特性.首先从理论上推导出了小信号增益条件下信号延时量的解析表达式;其次,在低抽运功率条件下(1 W),实验研究了10 Gb/s伪随机二进制序列脉冲信号在FOPA增益谱边带的延时特性,实验结果与理论计算基本符合;最后,通过分析研究抽运光功率、光纤色散及非线性系数等参数对信号延时量的影响规律,可以为FOPA增益谱边带的快慢光延迟线的设计提供参考. 相似文献
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多泵浦光纤喇曼放大器的模拟分析 总被引:1,自引:1,他引:0
通过使用综合理论模型对不同配置条件下的多泵浦分布式光纤喇曼放大器的增益谱进行了数值模拟研究,该理论模型包含了瑞利散射、放大自发辐射和不同交互效应,包括泵浦与泵浦、泵浦与信号和信号与信号之间的交互与能量转移.模拟研究了泵浦源功率、泵浦源波长间隔及光纤损耗对喇曼增益谱的影响,结果表明设计多泵浦光纤喇曼放大器需要对泵浦源功率、泵浦源波长间隔光纤损耗谱进行综合考虑,需对泵浦源功率、泵浦源波长间隔进行合理配置.在本文的泵浦源波长设定条件下,考虑实际光纤的损耗谱特性,为了获得大的增益带宽和小的增益不平坦度,短波长泵浦源和最长波长的泵浦源需要更高的泵浦功率,中间波长泵浦源的功率应较低. 相似文献
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Mrinmay Pal Somnath Bandyopadhyay Palas Biswas Rimlee Debroy M. C. Paul Ranjan Sen Kamal Dasgupta S. K. Bhadra 《Optical and Quantum Electronics》2007,39(14):1231-1243
In this paper, gain flatness is studied for simultaneous 16-ITU-T channel amplifications at C-band (1,532–1,558 nm) in a single
stage EDFA for WDM application at different average inversion levels. The inversion levels are varied due to the change of
the input signal levels from the targeted operating point and also for dropping few numbers of channels. Specially designed
gain flattening filter (GFF) is used in order to get the flat gain with gain variation ±0.5 dB for −20 dBm/ch input signal
power (total input signal power is −8.0 dBm) at a fixed average inversion level which is maintained by proper selection of
optimum fibre length and pump power. A specific loss spectrum of GFF is obtained by writing a chirped fibre Bragg grating
of length 20 mm. Gain variations are studied by changing the total input signal levels from −8.0 dBm to −20.0 dBm and maintained
within 20.0 ± 0.5 dB by using automatic gain control (AGC) circuit. About 15 out of 16 channels are dropped and observed ±
0.5 dB gain-variation which is an important parameter in optical network system. 相似文献
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由速率方程和功率传输方程得到信号脉冲平均功率和增益系数随脉冲传输距离的变化关系.利用Ginzburg-landau方程,在信号脉冲功率的不断增强和增益系数的不断变化的情况下,研究超短脉冲的传输演化特性,发现信号脉冲平均功率、能量和增益系数等参量受到色散和非线性效应的影响相对较小,而信号脉冲的峰值功率、时域和频域特性则易受到色散和非线性效应的影响.探讨了在非线性作用下,脉冲分裂和展宽等所导致的脉宽不稳定性对传输特性的影响,表明研究脉冲传输问题时,引入脉宽不稳定性有利于提高数值模拟准确度. 相似文献
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In this paper, we have solved propagation equations of multi-pump fiber Raman amplifier using Runge–Kutta (RK 4th order) numerical method and pump power evolutions along with the fiber length. They are used to calculate the net gain and gain ripple by varying the input signals powers for different fiber lengths. The pump powers are optimized by genetic algorithm and resulting net gain and gain ripple are reported graphically as well as in tabular form. The optimum minimum gain ripple is 0.26 dB for 1 mW input signal powers for 50 km fiber length. By increasing the fiber length gain ripple increases to 0.5 dB for 0.1 mW input signal power. In comparison to other methods reported in the literature, our method is simple to implement and efficient for numerical design of Raman amplification in optical communication systems. 相似文献
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A global design of an erbium-doped fiber and an open-loop erbium-doped fiber amplifier (EDFA) in a steady-state operation is discussed by applying genetic algorithms. Taking a signal gain and a bandwidth as objective functions, 7 parameters of the EDFA (erbium concentration, core radius, erbium-doped radius, refractive index difference, fiber length, pumping wavelength and signal power) are optimized by solving optical propagation equations, assuming a homogenous two-level active medium and a single-mode propagation. There is evidence to show that the 1480 nm pump utilized in usual EDFAs is not an optimal choice, which should be chosen around 1460 nm. The optimal core radius ranges 0.465–0.548 μm on pumping power 50–200 mW. Under different design objects and with different pumping powers, however, there are different optimal Er-doped concentrations, reflective index differences and fiber lengths. As a single fiber EDFA, 35 dB signal gain or 35 nm bandwidth is obtained with the 7 optimal parameters, 100 mW pumping power and 0.001 mW input signal power. 相似文献
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反向抽运光纤喇曼放大器增益特性分析 总被引:4,自引:0,他引:4
将打靶法和龙格库塔法两种数值计算方法相结合,对反向抽运光纤喇曼放大器中信号光和抽运光相互作用的耦合微分方程进行数值求解.在分别选取不同参量且取不同值的条件下,详细分析了光纤长度、初始信号光功率、初始抽运光功率、光纤有效面积、喇曼增益系数及光纤对信号光与抽运光的损耗等参量对增益的影响,最后提出了有效提高增益的方法. 相似文献
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在反射模式下,对于970nm宽面积垂直腔半导体光放大器(VCSOA)的增益和带宽特性进行了实验研究和分析。当注入电流为57%阈值电流、信号输入功率为0.7W,取得了24.8dB的放大,测得的放大器的带宽为0.14nm。实验中测量的增益值大于理论计算值,这是由于宽面积垂直腔光放大器内存在多个横向模式,每个模式都有相应的放大,所以总的增益大于理论计算的某个模式的增益。这种宽面积垂直腔光放大器不仅可以提高增益,而且还能提高信号光的饱和输入功率。对970nm宽面积VCSOA的结构进行了优化设计,模拟结果表明,要提高半导体激光器的增益和带宽,可以通过适当降低垂直腔面发射激光器的上DBR的反射率来获得。 相似文献