掺铒光纤超荧光光源外部增益平坦技术的研究

为满足光纤布拉格光栅传感和波分复用光纤通信系统对光源光谱平坦度与带宽的要求,利用外部增益平坦技术实现掺铒光纤超荧光光源输出光谱的平坦化。介绍了三种常见的外部增益平坦技术,并通过实验对平坦结果进行比较,由此得出采用长周期光栅增益平坦滤波器是一较好的选择。实验结果表明,平坦波段范围内(1 525~1 540nm)的光谱不平坦度小于±1.1dB,整个C波段光谱的3dB带宽为39.125nm。

Study on gain flattening for erbium-doped superfluorescent light source

In order to satisfy the demands for the spectral bandwidth and flatness of light source in the fiber Bragg grating sensing and wavelength division multiplexing(WDM) fiber optic communication system,the output spectrum of amplified spontaneous emission(ASE) needs to be flattened by using the gain filtering technique.Three technologies of gain flattening filter are described in the paper.The experimental results using the described gain flattening filter were compared.The long period fiber grating(LPFG) gain flattening filter is a better choice.Experiments show that with the LPFG gain flattening filter,the flatness of the spectra from 1 525 nm to 1 540 nm is less than ±1.1 dB,and the linewidth is 39.125 nm with a power ripple of 3 dB.