Note that all these structures are numerically simulated firstly and then verified by the experiments . fourthly , in accordance with the need of gain control in a wavelength division multiplexed system , a gain - clamped l - band edfa using a single fiber bragg grating ( fbg ) is proposed . based on the giles model with ase , numerical simulation for the all - optical gain - clamped edfa is carried out 最后给出一组使edfa在箱制增益的同时可以保持增益谱平坦的最佳结构和放大器参量;最后,初步介绍了光纤的非线性效应的产生机理及其对光通信系统的影响;实验研究了应用edfa测t布里渊散射阐值的实验装置与方法。