With the rapid development of coherent optical communication systems, lasers are required to have higher power and narrower linewidths. In this paper, a process method using buried heterojunction is proposed. By comparing the optoelectronic properties of lasers with different mesa widths and different cavity lengths, the laser with a 1000 µm cavity length and a mesa width of 2.4 µm can reach 133.7 mW at 25°C at 300 mA, and a side mode suppression ratio (SMSR) greater than 50 dB. This laser also exhibits low relative intensity noise ( < − 150 d B / H z at 260 mA) and narrow linewidth ( < 200 k H z ).

中文翻译：

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高功率1.55 µm埋地异质结分布反馈激光器，线宽小于200 kHz

随着相干光通信系统的快速发展，要求激光器具有更高的功率和更窄的线宽。本文提出了一种使用埋入式异质结的工艺方法。通过比较不同台面宽度和不同腔长的激光器的光电特性，腔长为1000 µm、台面宽度为2.4 µm的激光器在25°C、300 mA下可达到133.7 mW，边模抑制比（ SMSR）大于 50 dB。该激光器还表现出较低的相对强度噪声（ < - 150 d 乙 / H z 260 mA）和窄线宽（ < 200 k H z ）。