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为了实现高平坦的C+L波段放大的自发辐射光(ASE)光输出,提出并设计了一种基于LD单泵浦源,并且采用两段掺杂浓度完全相同的掺Er3+光纤(EDF)作为增益介质的宽带光源。对光源的基本原理及实现方案进行了理论分析和实验验证。首先,根据Er3+能级结构介绍C+L波段宽带光源的产生原理。然后,设计系统结构,在结构中采用976nm LD作泵浦源,通过耦合器将泵浦光按照一定比例分为两路对EDF泵浦;采用两支波分复用器(WDM)将泵浦光耦合进入EDF,并通过熔接环形镜(FLM)提高转换效率;输出端熔接隔离器(ISO)防止端面回波对输出造成影响。最后,根据EDF的ASE增益数学模型对EDF长度进行了分析和优化。实验结果表明,用于调整C波段ASE光输出的EDF1长选用2m,用于调整L波段ASE光输出EDF2长选为16m,获得平坦C+L波段ASE光输出,在不使用任何滤波器的条件下,在1 540~1 610nm波段范围内光谱平坦度为±0.525dB,在1 520~1 610nm范围内光谱平坦度为±1.119dB。本文方法使用1支976nm LD实现了C+L波段的高平坦输出,简化了系统结构,并降低了系统成本。
In order to realize high-flattened C + L band amplified spontaneous emission (ASE) light output, an LD-based single-pump source was proposed and designed. Two Er3 + doped fibers with the same doping concentration (EDF) Gain medium broadband light source. The basic principle of the light source and the realization of the program conducted a theoretical analysis and experimental verification. First of all, introduce the principle of C + L band broadband light source according to Er3 + level structure. Then, the system structure is designed. The 976nm LD is used as the pump source in the structure, and the pump light is divided into two pairs of EDF pumps according to a certain ratio. Two WDMs are used to pump Optical coupling into the EDF and improved conversion efficiency through the fused loop mirror (FLM); output fusion isolator (ISO) prevents the end echo from affecting the output. Finally, EDF length is analyzed and optimized according to EDE ASE gain mathematical model. The experimental results show that the EDF1 used to adjust the C-band ASE light output is 2m long and used to adjust the long-distance EDF2 output of the L-band ASE light output to 16m to obtain the flat C + L band ASE light output. Without using any filter , The spectral flatness is ± 0.525dB in the range of 1 540 ~ 1 610nm, and the spectral flatness is ± 1.119dB in the range of 1 520 ~ 1 610nm. This method uses a 976nm LD to achieve a high flat output in the C + L band, simplifying system architecture and reducing system cost.