在考虑了光纤光栅(FG)的相位分布之后，根据光纤光栅外腔半导体激光器(FGESL)所满足的阈值条件，从理论上研究了前端面反射率对光纤光栅长外腔半导体激光器(LECFGSL)激射波长温度稳定性的影响。数值模拟的结果表明：随着温度的变化，LECFGSL的激射波长围绕光栅布拉格反射波长上下波动，激光器前端面反射率对激射波长波动幅度有较大的影响，当前端面反射率＜10-4时，激射波长与光栅布拉格反射波长基本一致，其温度稳定性较好。

After taking into account the phase distribution of the Fiber Grating (FG) and starting from the threshold condition of the Fiber Grating External Cavity Semiconductor Laser (FGESL), the influence of the front facet (facing the FG) reflectivity on the lasing wavelength variation of the Long-External-Cavity Fiber Grating Semiconductor Laser (LECFGSL) with the ambient temperature has been investigated theoretically. The numerical simulations show that, with the ambient temperature variation, the lasing wavelength of the LECFGSL will fluctuate around the FG Bragg reflection wavelength; the front facet reflectivity has an obvious influence on the fluctuation amplitude of the lasing wavelength, and when the front facet reflectivity is less than 10-4, the lasing wavelength of the LECFGSL is nearly equal to the Bragg reflection wavelength of the FG.