title: Switchable dual-wavelength single-longitudinal-mode erbium-doped fiber laser using an inverse-Gaussian apodized fiber Bragg grating filter and a low-gain semiconductor optical amplifier.
abstract: We present a stable and switchable dual-wavelength erbium-doped fiber laser. In the ring cavity, an inverse-Gaussian apodized fiber Bragg grating serves as an ultranarrow dual-wavelength passband filter, a semiconductor optical amplifier biased in the low-gain regime reduces the gain competition of the two wavelengths, and a feedback fiber loop acts as a mode filter to guarantee a stable single-longitudinal-mode operation. Two lasing lines with a wavelength separation of approximately 0.1 nm are obtained experimentally. A microwave signal at 12.51 GHz is demonstrated by beating the dual wavelengths at a photodetector.
authors.affiliation: Photonics Research Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Bo
authors.initials: B
authors.lastname: Lin
authors.forename: Swee Chuan
authors.initials: SC
authors.lastname: Tjin
authors.forename: Han
authors.initials: H
authors.lastname: Zhang
authors.forename: Dingyuan
authors.initials: D
authors.lastname: Tang
authors.forename: Jianzhong
authors.initials: J
authors.lastname: Hao
authors.forename: Bo
authors.initials: B
authors.lastname: Dong
authors.forename: Sheng
authors.initials: S
authors.lastname: Liang