光子学报, 2018, 47 (12): 1214001, 网络出版: 2019-01-10
100 km光纤远端复现超窄线宽激光
Recovery of an Ultra-narrow Linewidth Laser over 100 km Fiber Link
光学频率 超窄线宽激光 精密传输 光纤相位噪声 中继站 Optical frequency Ultranarrow linewidth laser Precision transfer Fiber phase noise Repeater station
摘要
介绍了一种在光纤远端复现超窄线宽激光的方法.将两段50 km的光纤线路通过中继站级联在一起.用锁相跟踪法将中继站中的激光器频率锁定在50 km光纤远端传输光信号上, 跟踪精度达到3.5×10－19.为了保持高光谱纯度, 两个光纤噪声补偿模块独立工作, 用于补偿每段50 km光纤引入的相位噪声.这种级联方案能够确保噪声补偿具有较大的动态范围.经补偿后, 100 km光纤引入的频率不稳定度达到5.9×10－17(1 s平均时间), 10 000 s后达到6.8×10－19.实现了在100 km光纤远端复现超窄线宽激光, 附加线宽低至1 mHz.
Abstract
It is demonstrated that an ultranarrow linewidth laser is recovered after transfer through a 100 km fiber link. The fiber link consists of two 50 km spolled fibers cascaded by a repeater station where a transceiver laser is phase-locked to the transferred light of the 50 km fiber with tracking precision of 3.5×10－19. To maintain the high spectral purity, two fiber noise compensation modules are employed to compensate for the fiber-induced phase noise in each 50 km fiber. The cascaded scheme enables a large dynamic range for the noise compensation. The fractional frequency instability for the stabilized 100 km fiber is 5.9×10－17 at 1 s averaging time, reaching 6.8×10－19 at 10 000 s. The ultranarrow linewidth laser is recovered at the remote end of the 100 km fiber with additional linewidth of 1 mHz.
马超群, 陈国庆, 李磊, 辜姣, 朱纯, 朱焯炜. 100 km光纤远端复现超窄线宽激光[J]. 光子学报, 2018, 47(12): 1214001. MA Chao-qun, CHEN Guo-qing, LI Lei, GU Jiao, ZHU Chun, ZHU Zhuo-wei. Recovery of an Ultra-narrow Linewidth Laser over 100 km Fiber Link[J]. ACTA PHOTONICA SINICA, 2018, 47(12): 1214001.
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