中文摘要：

提出了优化由两个均匀布拉格光纤光栅组成的980nm半导体激光器波长锁定器的方法以满足光纤放大器对半导体激光器的性能要求。运用耦合模理论推导了双布拉格光纤光栅（FBG）的透射率和反射率的解析表达式和波长锁定器增益方程。研究了两光栅之间的距离、光栅到激光器前端面的距离、光栅折射率、光栅折射率周期、光栅栅长和温度对激光器增益曲线的影响,并通过优化这些参数来达到最佳的锁模性能。测量了带双FBG波长锁定器的非致冷半导体激光器的输出光谱和出纤功率。实验结果表明：高功率非致冷980nm半导体激光器在0～70℃时的波长漂移为0.5nm,边模抑制比达45dB以上,半峰值全宽度〈1nm。经优化设计的980nm半导体激光器FBG波长锁定器可满足光纤放大器对非致冷半导体激光器大功率、长寿命、高可靠性、小尺寸等性能的要求。

英文摘要：

A optimization method is put forward for a wavelength stabilizer with dual Fiber Bragg Grating （FBG） used in 980 nm semiconductor lasers to meet the performance requirements of fiber amplifiers.The analytical expressions of transmittivity and reflectivity of dual FBG and the gain equations of the stabilizer are obtained by the coupled mode theory.The effects of the distance between the two gratings,the distance between laser front face and dual FBG,the period of refractivity,grating length,the refractivities and ambient temperatures of two gratings on the laser gain curves are analyzed.And these parameters then are optimized to achieve the best mode-stabilizing characteristics.The output spectral characteristics and powers of the uncooled semiconductor laser with dual FBG wavelength stabilizer are practically measured.Experimental results indicate that when the laser operates at 0～70 ℃,the wavelength shift is 0.5 nm,the Side Mode Suppression Ratio （SMSR） is more than 45dB,and the Full Width at Half Maximum （FWHM） is less than 1 nm.The optimized wavelength stabilizer with FBGs can satisfy the requirements of fiber amplifiers for uncooled semiconductor lasers,and can achieve high powers,long life,high reliability,small sizes,and low costs.