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运用耦合模理论推导了双光纤布拉格光栅(FBG)的透射率和反射率的解析表达式,进一步推导出带双光纤布拉格光栅激光器的增益方程。利用相关表达式讨论双光纤布拉格光栅的反射特性与透射特性,并探究对激光器增益曲线的影响。双光纤布拉格光栅由结构和特性相同的单光纤布拉格光栅构成,通过优化两光纤布拉格光栅之间的距离得到最佳的锁模特性。在工作温度为0℃,20℃,70℃时,分别测量了带双光纤布拉格光栅和单光纤布拉格光栅波长锁定器的非致冷抽运激光器的输出光谱。其结果表明带双光纤布拉格光栅的非致冷抽运激光器输出光谱的稳定性得到了显著改善。在0~70℃温度范围内能稳定工作,波长漂移为0.2 nm,边模抑制比达45 dB,半峰值宽度小于1.57 nm。
The analytical expressions of transmittance and reflectance of dual fiber Bragg grating (FBG) are deduced by coupling mode theory, and the gain equation of dual-fiber Bragg grating laser is deduced further. The relative expressions are used to discuss the reflection and transmission properties of the two fiber Bragg gratings and to explore the effect on the laser gain curve. Dual Fiber Bragg Gratings consist of a single fiber Bragg grating of identical structure and characteristics, optimized for mode-locking by optimizing the distance between two Fiber Bragg gratings. The output spectra of uncooled pumped lasers with dual fiber Bragg gratings and single fiber Bragg grating wavelength lock were measured at operating temperatures of 0 ° C, 20 ° C and 70 ° C, respectively. The results show that the stability of the output spectrum of the uncooled pumped laser with dual fiber Bragg gratings has been significantly improved. In the temperature range of 0 ~ 70 ℃ stable operation, the wavelength drift of 0.2 nm, the side mode suppression ratio of 45 dB, half-width less than 1.57 nm.