Low-Noise Frequency and Phase Locking of Yb-Doped Fiber Ring Cavity via Cavity Modulation

• Published in: Journal of lightwave technology Vol. 40; no. 13; pp. 4379 - 4384
• Main Authors: You, Yang, Shen, Hui, Qi, Yunfeng, Bing, He, Zhou, Jun
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: DFB fiber laser; Doped fibers; Feedback control; Fiber lasers; fiber ring cavity; injection lock and phase-locked loop (IPLL); Locking; Low noise; Optical fiber amplifiers; Optical fiber communication; Optical fiber polarization; Phase noise; Polarization; Power lasers; Ring structures; Semiconductor lasers; Servomotors; Stability analysis; Systems stability
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2022.3160274

The control bandwidth of the injection-locked system utilizing a DFB fiber laser and fiber ring cavity is analyzed to estimate system stability. Within the bandwidth of the injection lock, an electrical feedback control loop is adopted to better suppress the phase noise of the fiber ring cavity. The entire system operates in low noise conditions of lower than −60 dBc/Hz from 1 Hz to 100 kHz. The output power of the fiber ring cavity is amplified stably to 0.346 W with a polarization extinction ratio of 31 dB based on an all-polarization-maintaining ring structure. The output laser from the single-mode fiber has the near diffraction-limited beam quality for wide applications.