掺镱光纤放大器的优化设计

Design of Optimized Ytterbium-doped Fiber Amplifiers

掺镱光纤放大器（ＹＤＦＡ）以其简单的能级结构，不存在对信号或泵浦的激发态吸收，不存在浓度淬灭效应以及有较宽的吸收光谱和发射光谱而引起了人们的重视．本文分析了隔离器、滤波器和光纤光栅对ＹＤＦＡ的优化原理，并讨论了隔离器、滤波器在激活光纤内的最佳位置，分析方法采用了简单的分段模型．

Recently,interest has been shown in YDFA. The reasons for this growth of interest include it's simple energy level structure, no excited state absorption at either pump or signal wavelengths, no concentration quenching, and it's broad spectrum both in absorption and emission. In this paper, the YDFA's which incorporates isolator, filter or fiber grating are investigated theoretically, using a simple model. The optimum placement of the filters and isolators are also calculated so that the gain and noise performance can be improved simultaneously.