Title :
Switchable Single-Polarization Dual-Wavelength Ring Laser Based on Structured PM-CFBG
Author :
Bin Yin ; Suchun Feng ; Yunlong Bai ; Zhibo Liu ; Linjun Liang ; Shuo Liu ; Shuisheng Jian
Author_Institution :
Key Lab. of all Opt. Network & Adv. Telecommun. Network, Beijing Jiaotong Univ., Beijing, China
Abstract :
A switchable single-polarization dual-wavelength single-longitudinal mode (SLM) erbium-doped fiber (EDF) ring laser is proposed and demonstrated. For the first time, the structured polarization-maintaining chirped fiber Bragg grating (PM-CFBG) filter, which has ultranarrow transmission band is created by tapering directly on the PM-CFBG. Then, the stable SLM operation of the fiber laser is guaranteed by the structured PM-CFBG filter and 20-cm unpumped EDF acting as a saturable absorber. Meanwhile, the stable dual-wavelength fiber laser with a wavelength spacing of ~0.41 nm and stable single polarization state is experimentally realized. The measured linewidth of the fiber laser for each wavelength is <;8 kHz with a 20-dB linewidth.
Keywords :
Bragg gratings; erbium; fibre lasers; laser modes; laser stability; optical fibre filters; optical fibre polarisation; optical saturable absorption; optical switches; ring lasers; fiber laser linewidth; saturable absorber; size 20 cm; stable SLM operation; stable dual-wavelength fiber laser; stable single polarization state; structured PM-CFBG filter; structured polarization-maintaining chirped fiber Bragg grating filter; switchable single-polarization dual-wavelength single-longitudinal mode erbium-doped fiber ring laser; ultranarrow transmission band; unpumped EDF; wavelength spacing; Erbium-doped fiber lasers; Laser stability; Measurement by laser beam; Optical fiber filters; Optical fiber polarization; Chirped fiber Bragg grating; dual-wavelength fiber laser; polarization-maintaining; single-longitudinal-mode;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2318773
