A switchable dual-wavelength fiber laser based on phase-shifted fiber Bragg grating combined with Sagnac loop

• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2019,（2）
• 页码范围: 122-126
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s11801-019-8126-1

摘要

A switchable dual-wavelength erbium-doped fiber (EDF) laser is proposed and demonstrated.The interference filter is achieved by employing a phase-shifted fiber Bragg grating (PSFBG) combined with Sagnac loop structure.By adjusting polarization controller (PC) states,the birefringence effect is introduced to weaken mode competition,then stable and switchable dual-wavelength fiber laser can be realized.Based on coupled-mode theory and transmission matrix,the Sagnac loop transmission characteristics are studied.The experimental results show that the proposed fiber laser can operate in switchable dual-wavelength output mode at room temperature just by simply adjusting PC.The output wavelength range of fiber laser is 1 556.128-1 556.384 nm,the side mode suppression ratio (SMSR) is over 45 dB,and dual-wavelength spacing as small as 0.048 nm is achieved,which can be used in high-fineness dense wavelength division multiplexing (DWDM) systems and similar structures.