Luo Xi-Chen, Chen Chao, Ning Yong-Qiang, Zhang Xing, Qiu Cheng, Chen Jia-Qi, Yin Xiao-Jie, Qin Li, Wang Li-Jun
Opt Express. 2021 Oct 11;29(21):33109-33120. doi: 10.1364/OE.431341.
We demonstrate a high linear polarization, narrow linewidth hybrid laser composed of a semiconductor gain chip and a high birefringence waveguide Bragg grating (WBG). The laser operates in the C-band, and a maximum output power of 8.07 mW is obtained in the fiber waveguide. With careful temperature tuning, the hybrid laser can operate in a single longitudinal mode state from above the threshold current to 410 mA. The side mode suppression ratio (SMSR) reaches a value of 50.2 dB, and the polarization extinction ratio exceeds 39.6 dB. We numerically analyze the linewidth suppression for the Bragg grating based on adiabatic chirp theory. The hybrid laser shows a narrow linewidth of 4.15 kHz and a low relative intensity noise (RIN) of <-155 dBc/Hz, providing a high-performance light source for coherent light communication.
我们展示了一种由半导体增益芯片和高双折射波导布拉格光栅（WBG）组成的高线性偏振、窄线宽混合激光器。该激光器在C波段工作，在光纤波导中获得了8.07 mW的最大输出功率。通过仔细的温度调谐，混合激光器可以在从阈值电流以上到410 mA的范围内以单纵模状态工作。边模抑制比（SMSR）达到50.2 dB，偏振消光比超过39.6 dB。我们基于绝热啁啾理论对布拉格光栅的线宽抑制进行了数值分析。该混合激光器显示出4.15 kHz的窄线宽和<-155 dBc/Hz的低相对强度噪声（RIN），为相干光通信提供了一种高性能光源。
