Stable single-longitudinal-mode fiber laser using PM FBG F-P etalon and PM fiber saturable absorber

• DOI: 10.1007/s11082-010-9416-9
• Publication Date: 2010-09-30T12:35:31Z
• Authors: Zhiyong Dai; Jianfeng Li; Xiaoxia Zhang; Zhonghua Ou; Yongzhi Liu
• Keywords: Saturable absorption; Fiber Bragg Grating; Laser linewidth; Longitudinal mode

we present a stable and high efficiency single-longitudinal-mode (SLM) fiber ring laser by using polarization-maintaining fiber Bragg grating Fabry-Perot (PM FBG F-P) etalon combining PM fiber saturable absorber. The PM FBG F-P etalon, which is directly fabricated in hydrogen-loaded PM fiber, is used as reflector and mode-selecting component to reduce the longitudinal-mode density greatly. Meanwhile, a segment un-pumped PM Er3+-doped fiber (EDF) serves as saturable absorber to suppress mode hopping and ensure the stable SLM operation. Stable SLM laser output at 1550.4 nm with linewidth of 2.0 kHz is observed. Laser output power is 43.7 mW for a pump power of 148 mW, optical-optical efficiency is 29.5% and signal-to-noise ratio (SNR) is larger than 55 dB.