OAM-RC

Abstract

A novel erbium-doped fiber laser outputting simultaneously eight-wavelength at most was presented. This laser employed the simple structure of linear cavity. Two Sagnac loops constituted two cavity mirrors of the laser. A broadband chirped fiber grating (BCFG) with 3dB linewidths of 40 nm, a three-ring-type polarization controller (PC) and a 3dB fiber coupler (FC) consisted of left Sagnac loop. The BCFG also had the optical signal-to-noise ratio (OSNR) of 18 dB. Right Sagnac loop consisted of another same FC and a length of 3 m long multimode fibers (MMFs) with core diameter of 50 μm. The two loops based on different operational principles became two different comb filters, which could mutually produce the multiple wavelengths to output. When the PC was rotated continually to different locations and would cause the PHB effect, the laser could flexibly switch to export sixteen sorts of different lasing lines. The whole lasing lines had less than 0.23 nm linewidths and the OSNR of greater than 17 dB. The laser showed better power and wavelength stabilities at room temperature.

Keywords

Erbium-doped fiber laser, Broadband chirped fiber grating, Comb filter.

Citation

JIANQUN CHENG, BINGFENG FAN, Switchable eight-wavelength laser based on broadband chirped fiber grating and 50 μm MMF, Optoelectronics and Advanced Materials - Rapid Communications, 17, 5-6, May-June 2023, pp.179-184 (2023).

Submitted at: Sept. 20, 2022

Accepted at: June 6, 2023