Tunable and Switchable Dual-Wavelength SLM Narrow-Linewidth Fiber Laser with a PMFBG-FP Filter Cascaded by Multi-Ring Cavity
Mingquan Gao,
Bin Yin,
Yanzhi Lv,
Guofeng Sang,
Benran Hou,
Haisu Li,
Muguang Wang,
Songhua Wu
Affiliations
Mingquan Gao
College of Information Science and Engineering, Ocean University of China, No. 238 Songling Road, Qingdao 266100, China
Bin Yin
College of Information Science and Engineering, Ocean University of China, No. 238 Songling Road, Qingdao 266100, China
Yanzhi Lv
College of Information Science and Engineering, Ocean University of China, No. 238 Songling Road, Qingdao 266100, China
Guofeng Sang
College of Information Science and Engineering, Ocean University of China, No. 238 Songling Road, Qingdao 266100, China
Benran Hou
College of Information Science and Engineering, Ocean University of China, No. 238 Songling Road, Qingdao 266100, China
Haisu Li
Key Laboratory of All Optical Network and Advanced Telecommunication Network of EMC, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China
Muguang Wang
Key Laboratory of All Optical Network and Advanced Telecommunication Network of EMC, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China
Songhua Wu
College of Information Science and Engineering, Ocean University of China, No. 238 Songling Road, Qingdao 266100, China
A single longitudinal mode (SLM) dual-wavelength switchable erbium-doped fiber laser (DW-EDFL) based on polarization-maintaining fiber Bragg grating Fabry–Perot cavity (PMFBG-FP) cascaded multiple sub-ring cavities (MSCs) is proposed. A PMFBG-FP with a narrow-band transmission peak and MSCs was implemented as an optical filter to achieve stable dual-wavelength laser output and guaranteed SLM status. By stretching the PMFBG, a highly stable dual-wavelength tunable output could be achieved with a maximum tuning interval of 0.17 nm. The optical signal-to-noise-ratio (OSNR) at dual-wavelength lasing was higher than 57 dB, and the optimal wavelength and power fluctuations within 0.5 h were 0.01 nm and 0.79 dB, respectively. Meanwhile, the measured linewidths of each wavelength were 1.55 kHz and 1.65 kHz, respectively. The measured polarization states of the two laser wavelengths were linear and orthogonal, with a degree of polarization (DOP) of nearly 100%.
