The reaction of threshold on linewidth of ring ' s output light is pointed out . this provides a new auxiliary method to determine the threshold 最后提出一种利用有源腔内ase输出光的线宽变化特征来判断有源光纤环形腔阈值点的辅助方法。
Only when the length of ring cavity is below that value , relaxation oscillation happens , and frsl have good modulation response and large modulation bandwidth 只有当环形腔长度小于该临界值时，激光器才发生弛豫振荡，并具有理想的调制响应和大的调制带宽。
( l ) ill tlle second cllapter of this dissertation , the behaviors of the active liber resonators are studied by both theoretical and experimel1tal ways , when it is under the threshold 一、在本文第二章，对有源光纤环形腔在阈值以下的特性进行了理论分析和实验研究。
The paper presents a new scheme of wavelength conversion , which based on fiber ring semiconductor lasers ( frsl ) . its configuration and operating principle are demonstrated 本文提出一种基于光纤环形腔半导体激光器( frsl )的波长转换方案，阐述了其结构模型和工作原理。
We also propose a new subsidiary method for finesse measurement based on selfhomodyne by x m . using of resonating of the intra - cavity amplified spontaneous emission ( ase ) light , without extemal light source 同时提出利用腔内ase输出光的线宽来测量有源光纤环形腔滤波器的精细度，而不需要注入光。
Upper the threshold , it became fiber ring laser . in this dissertation , the polymorphic characteristics of tunable er ' + - doped fiber ring resonators below , near and upper tllresllold are chiefly analyzed 本文主要对可凋谐掺铒光纤环形腔在阈值以下、阈值附近以及阈值以上多种工作状态时的特性进行了实验研究。
( 2 ) ln the third chapter of this dissertation , the behaviors of intra - cavity amplified spontaneous emission ( ase ) light in the active fiber resonators are firstly studied by both theoretical and experiment8l ways , when it is operating near the threshold 二、在本文第三章中，研究无注入光时，通过分析腔内ase光输出特性来研究有源光纤环形腔在近阈值点附近的滤波特性。
The wavelength converter based on frsl has simple configuration . only signal light is essential at input port , and continuous wave used as pump light in other wavelength converters is not needed . besides , it is convenient to insert control components in the fiber ring cavity Frsl波长转换器结构简单，在输入端只需输入待转换的信号光，无须输入连续波作为泵浦光，并且易于在光纤环形腔中插入各种控制元件。
Just below threshold , consistel1t to theoretical analysis , there are numbers of comb - like narrow linewidth lights due to resonating of ifltr8 - cavity ase light . novel experimental results of the erbium - doped - fiber ring resonator behaviors operating near threshold are reported in the chapter 首先理论分析了当有源环形腔无注入光，且有源光纤环形腔在阈值以下时，由有源腔内ase输出光表现出的腔输出特性。
4 . the fundamental principles of both the linear cavity fiber laser and the ring cavity fiber laser and the stability criterion for multiwavelength oscillations are introduced . several kinds of techniques to achieve mulitwavelength oscillations are summarized 4 .介绍了线形腔光纤激光器和环形腔光纤激光器的基本理论以及多波长激光器稳定振荡的条件,并总结了几种实现多波长掺铒光纤激光器的稳定振荡的方法。
