中国激光, 2019, 46 (9): 0901003, 网络出版: 2019-09-10
1550 nm波段窄线宽高调谐带宽激光光源 下载: 1316次
1550 nm Laser Source with Narrow Linewidth and High Tuning Bandwidth
激光器 窄线宽 高调谐带宽 外电光调制 窄带光栅滤波 零差相干光通信 lasers narrow line width high tuning bandwidth external electro-optic modulation narrowband fiber grating filtering homodyne coherent optical communication
摘要
随着空间技术的发展,空间数据传输速率日益成为制约空间科技应用的瓶颈。空间相干光通信技术由于其较高的通信灵敏度、较强的抗干扰能力和较高的保密性成为研究的热点。在空间相干光通信技术中,零差相干光通信体制在理论上具有最好的灵敏度和抗干扰能力,但需要复杂的锁相闭环系统,对本振激光器的线宽和激光频率调谐带宽都提出了很高的要求。在1550 nm波段,现有的常规激光器难以同时满足窄线宽和高调谐带宽的要求。为此,采用窄线宽种子源结合外电光调制和窄带光栅滤波的方案,实现了光谱信噪比约为28 dB、线宽约为5 kHz、激光频率调谐带宽约为1.5 MHz的激光光源输出。
Abstract
With the development of space technology, spatial data transmission rate is becoming a bottleneck associated with its application. Spatial coherent optical communication technology has become a popular research topic in many countries because of its high communication sensitivity, anti-interference ability, and high confidentiality. In this technology, the homodyne coherent optical communication system theoretically exhibits optimal sensitivity and anti-interference ability, but simultaneously requires a complex phase-locked closed-loop system and a local oscillator laser with large linewidth and laser-frequency-tuning bandwidth. In the 1550-nm band, it is difficult for the conventional lasers to simultaneously satisfy the narrow linewidth and high tuning bandwidth requirements. Herein, a narrow linewidth seed source combined with external electro-optic modulation and narrowband grating filtering is used to create a laser source exhibiting a spectral signal-to-noise ratio of approximately 28 dB, a linewidth of approximately 5 kHz, and a laser-frequency-tuning bandwidth of approximately 1.5 MHz.
古建标, 朱福南, 刘磊, 赵思伟, 魏芳, 李璇, 朱韧, 侯霞, 陈卫标. 1550 nm波段窄线宽高调谐带宽激光光源[J]. 中国激光, 2019, 46(9): 0901003. Gu Jianbiao, Zhu Funan, Liu Lei, Zhao Siwei, Wei Fang, Li Xuan, Zhu Ren, Hou Xia, Chen Weibiao. 1550 nm Laser Source with Narrow Linewidth and High Tuning Bandwidth[J]. Chinese Journal of Lasers, 2019, 46(9): 0901003.