L-Band掺铒光纤放大器的优化设计

提出了泵浦分配两段级联,并利用前向ASE推动下一级EDF工作的L-Band放大器的新结构.基于Giles模型并考虑了ASE噪声的影响,运用数值模拟算法系统分析了泵浦光功率分配和铒光纤分配比例对这种EDFA性能的影响.最后优化得到高增益且增益谱平坦的L-Band EDFA,其在输入信号光功率为-20 dBm时,在1571～1608 nm范围内,增益值高达35 dB,增益偏差小于1 dB.     

WDM用增益平坦的高增益低噪声双段级联掺铒光纤放大器

给出了设计波分复用(WDM)用高增益、低噪声和宽带宽增益平坦的双段级联掺铒光纤放大器(EDFA)的一般步骤和方法.通过优化设计各种参量,研制出了一台高增益、低噪声和宽带宽增益平坦的双段级联EDFA样机,实现了从1524.8～1561.4 nm共36.6 nm带宽内±0.325 dB的平坦增益,0 dBm输入时,饱和输出功率大于15 dBm的高功率输出;噪声指数低于5 dB.     

高增益掺铒光纤的设计和制备研究

掺铒光纤放大器在光通信中有着广泛的应用。根据掺铒光纤的性能要求设计了合理的折射率剖面图,制备了高增益的掺铒光纤,在1530nm的吸收达到22dBm,在980nm泵浦光的吸收达到12dBm。其平坦增益带宽范围为1490—1560nm。     

低噪声、高增益的L -band EDFA的实验研究

针对传统的L-band EDFA的工作效率低,提出了一种基于单根光纤光栅、泵浦分配、两段级联的EDFA的新结构,其中的光纤光栅用来反射无用的后向C-band ASE.系统地研究了泵浦比例和光纤光栅波长对增益噪声指数的影响关系.最后经实验验证,得到了低噪声、高增益的L-band的EDFA.其在输入信号光（1570 nm）功率为-30 dBm及泵浦功率为70 mW时,增益为22.26 dB,增益噪声指数为4.96 dB.     

一种增益可调掺铒光纤放大器的研究

在所设计的增益可调掺铒光纤放大器中,采用可编程控制器PC机控制可变直流电压源引发压电陶瓷的电致伸缩效应,导致光纤布拉格光栅的Bragg波长发生漂移,实现被调制参数的变化.分析了双光纤光栅受到压电陶瓷电致伸缩效应时的反射谱变化规律和增益可调掺铒光纤放大器的放大特性.由该放大器的增益与输入信号功率的关系得出小的波长间隔,增益较小,但控制范围较大;大的波长间隔,增益较大,但控制范围较小的结论.在输入宽带光源时,得到两光纤布拉格光栅在不同中心波长之差时的掺铒光纤放大器的增益特性.     

Simulation Performance of Erbium-Doped Fiber Amplifiers

In this paper, a simple approach is introduced to simulate the main performance of erbium-doped fiber amplifiers by using two empirical formulas to calculate saturated gain and corresponding noise figure. Then conflict equations are presented to improve this approach. At the end of the paper the comparison of calculation results before and after improvement is given. It has been shown to be more accurate.     

掺铒光纤放大器的频率响应和瞬态增益

根据掺铒光纤放大器（ＥＤＦＡ）的速率方程和传播方程,忽略自发辐射噪声,推导出了小信号调制时频率响应函数的解析表达工以及大信号调制时描述瞬态增益的方程。数值计算表明,当输入信号的调制频率大于５ｋＨｚ时,放大器的瞬态增益变化很小,频率响应很弱。通过计算机仿真,描述了关闭一个信道时的放大器的增益变化过程。     

双程掺镱光纤放大器的增益特征及优化

比较了掺钕光纤和掺镱光纤对1064 nm光放大的特点.基于速率方程和传输方程,数值分析了在915 nm泵浦下双程掺镱光纤放大器的增益特征,并且和传统的单程放大进行了比较.分析了信号光和泵浦光,以及粒子数沿着光纤方向的分布特点.最后对双程掺镱光纤放大器进行了优化.     

A Novel Erbium-Doped Fiber Amplifier Simulator for Gain Excursion Estimation in Multi-Channel Dynamic Optical Network

Abstract

A novel erbium-doped fiber amplifier simulator designed using the SIMULINK toolbox of MATLAB 7.0 (The MathWorks, Natick, MA, USA) is reported in this article. The present simulator has an ability to incorporate multi-channel amplification simultaneously in both the C- and L-bands. It is realized by defining new FUNCTION block sets and replacing the MATLAB FUNCTION block set reported earlier for multi-channel amplification. Spectral variation of gain for an erbium-doped fiber amplifier simulator is first verified in both the C- and L-bands. Next, the simulator is employed to study gain excursion in a multi-channel dynamic optical network, where the change in the gain excursion by varying the pump power has also been estimated. The present approach to estimate the gain excursion will find applications in quantifying inter-channel cross-talk due to cross-gain saturation among co-propagating multi-channels in a dynamic optical network.     

掺钕光纤放大器的弯曲损耗对增益的影响

利用掺钕光纤放大器的粒子数速率方程、功率传输方程和光纤弯曲损耗公式,对光纤弯曲损耗所引起的增益变化进行了数值模拟,分析了对于不同半径和波长下光纤弯曲损耗对光纤增益的影响,结果表明,对于一定长度的光纤,其增益随弯曲半径的减小而减小,当弯曲达到一定值时,增益发生急剧的降低;随弯曲半径的减小,其增益谱线发生下移,这对实验研究有着重要的指导意义。     

Modulation Frequency Characteristics of Erbium-Doped Fiber Amplifier

The modulation frequency characteristics of an erbium-doped fiber amplifier are analyzed theoretically and experimentally for various values of modulation frequency. The theoretical predictions by the approximate equations in the low and high frequency modulation and that by the Runge-Kutta method for all modulation frequencies are in good agreement with the experimental results. In the low frequency modulation, the population inversion is depleted because of the saturation effect due to the instantaneous power of the incident light, and a distorted output is obtained without phase delay. In the high frequency modulation, the linear amplification is obtained with the gain depletion determined by the time averaged power of the incident signal. In the intermediate frequency modulation, the highly distorted output is obtained with phase delay.     

Gain and Noise figure performance of erbium doped fiber amplifiers (EDFAs) and Compact EDFAs

In this paper, we compare the Gain and Noise figure characteristics of physical EDFAs and Compact EDFAs in an optical system consisting of cascade of both the amplifiers. We demonstrate the gain, noise figure variations of a forward pumped EDFA and Compact EDFAs as functions of Er³⁺ fiber length, injected pump power and up-conversion co-efficient. It is observed that the gain becomes constant when the length of both the amplifiers reaches above 20 m. The comparison shows that the higher gain with flatter output is obtained in case of Compact EDFAs than Physical EDFAs in a system consisting of chain of both the amplifiers. It is further investigated that the agreement between the Compact and Physical EDFA models is good up to 10 m with the no up-conversion co-efficient. Also, the noise figure obtained in case of Physical EDFA is higher than Compact EDFAs when same amplifier length is more than 20 m and then becomes constant for both the amplifiers.     

反向抽运光纤喇曼放大器增益特性分析

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.     

混合型光纤喇曼放大器增益和带宽的研究

混合型色散补偿光纤喇曼放大器由普通G652光纤和色散补偿光纤(DCF)组成,包括:DCF +G652、G652 +DCF和 G652+DCF +G652。讨论了它们的工作原理.使用FRA-OptiAmplifier4.0软件对其进行了优化设计,最佳结构为G652 +DCF.它可补偿光纤网络的色散,扩展通信波长范围.1427 nm的喇曼激光器作为激发源,用Q8384光谱分析仪测量了光纤的喇曼增益谱和小信号放大光谱,混合型色散补偿光纤喇曼放大器在S带和C带具有88 nm的增益带宽,这增加了光纤通信网络的传输通道.     

Gain Flattened Raman Fiber Amplifier Using Parameter Optimization and DCF Fiber

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.     

拉曼光纤放大器增益谱特性研究

分析了影响拉曼光纤放大器增益谱的几个因素。在四抽运激光器抽运时，模拟了多抽运激光器抽运时的拉曼增益谱特性。实验中，采用增益平坦滤波器和功率分配两种方法实现增益谱平坦，指出了功率分配方法的优势。     

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

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.     

掺铒光纤放大器的增益特性

采用980nm无铝InGaAs/InGAsP/InGaP高功率量子阱激光器泵浦掺铒光纤放大器。在泵浦功率为20mW时,增益为33dB,最大增益系数6．7dB/mW,饱和输出功率为6dBm,并给出掺铒光纤长度和泵浦功率与增益特性的关系。以及输出功率与增益特性的关系。     

掺铒光纤放大器的理论模拟与全局分析

基于Giles模型并考虑了ASE噪音,对各种泵浦方式下的掺铒光纤放大器(EDFA)进行了数值模拟.提出了一种新的分析方法(增益噪音指数全局分析法),直观有效地分析了EDFA的增益和噪音指数与掺铒光纤长度和泵浦功率的依赖关系,并对各种EDFA的性能作了全面的比较.