In this work , based on the threshold condition of the fiber grating external cavity semiconductor laser ( fgesl ) which the phase of the fiber grating has been included , the effect of the temperature variation and the fg external cavity length on the lasing wavelength of the fgesl has been investigated theoretically . in addition , we have used the phase condition of fgesl to get the longitudinal mode distribution of fgesl , then the influence of the injected current on the output characteristics of fgesl has been studied 基于此,本文中利用陽實(shí)際的反射相位分布,計(jì)及半導(dǎo)體激光器( ld ) 、外腔及光纖光柵( fg )三者的共同作用,根據(jù)fgesl滿足的閩值條件,從理論上研究了溫度及外腔長度的變化對(duì)fgesl激射波長的影響;根據(jù)fgesl中縱模所滿足的相位條件得到其縱模分布后,利用fgesl滿足的多模速率方程,研究了ld的注入電流對(duì)fgesl輸出特性的影響。