半导体激光器与光纤光栅对接耦合研究

半导体激光器管芯与光纤光栅的对接耦合对光纤光栅外腔激光器的特性起到关键作用。利用散射矩阵分析了激光器管芯与光纤光栅外腔的对接耦合，发现对接的距离以及对接的耦合效率决定了光纤光栅外腔激光器的性能。在强反馈情况下,激射波长在光纤光栅外腔有效反射率决定的布喇格波长内随对接耦合距离周期性的变化,对弱反馈情况则有些不同。同时对比了两种情况的边模抑制比。该分析为实际制作器件提供了指导。

Theoretical Study on the Butt-coupling of Semiconductor Laser and Fiber Bragg Grating

The butt-coupling between a semiconductor laser diode and a fiber Bragg grating external cavity acts a key roll on the laser characteristics. The scatter matrix method considering the butt-coupling efficiency is used to analyze the butt-coupling between them. It is found that the butt-coupling distance and coupling efficiency determine the laser characteristics. For strong feedback, the single lasing wavelength changes in the reflection bandwidth of the effective reflectivity (approximately the Bragg region of the fiber Bragg grating) as the distances change. For weak feedback condition, some different results are obtained. The SMSRs in the two conditions are presented and analyzed. These results can provide important design guidance of device parameters for the practical fabrication.