Multiwavelength erbium-doped fiber ring lasers with overlap-written fiber Bragg gratings

Abstract

Eight-wavelength Er-doped fiber lasers with lasing wavelength separations of ~1.6 and ~0.8 nm , respectively, have been achieved by use of overlap-written fiber Bragg gratings (OWFBG's) in the fiber lasers and by cooling of the Er-doped fiber with liquid N(2) . Our experiment shows that by utilizing the OWFBG's to select the lasing wavelengths one can achieve fiber lasers with lasing wavelengths and lasing wavelength separations that match the International Telecommunication Union channel-allocation grid well.

A tunable and switchable wavelength spacing of multi-wavelength erbium doped fiber laser by exploiting nonlinear polarization rotation

“…Various gain media together with different techniques and methods for comb filter have been investigated. By using two overlap written fiber Bragg gratings (FBG) which are made from eight different-period UV written in the same segment of a fiber core, simultaneous lasing as many as eight wavelengths with lasing wavelength separations of 1.6 and 0.8 nm by cooling the Er-doped fiber in liquid N2 was demonstrated in an Er-doped fiber ring laser [1]. A multi-wavelength fiber ring laser was achieved by using of a semiconductor optical amplifier (SOA) with a Fabry-Perot filter, which obtained more than 50 simultaneous wavelength lasing oscillations with a frequency separation of 50 GHz [2].…”

Switchable Single-Polarization Dual-Wavelength Ring Laser Based on Structured PM-CFBG

“…To ensure a stable operation of an SLM dual-wavelength erbium-doped fiber (EDF) laser, we need to overcome the strong homogeneous line broadening and cross-gain saturation which lead to unstable dual-wavelength oscillation. Various techniques have been proposed to realize dual-wavelength oscillation by cooling the EDF in liquid nitrogen (77K) [3], utilizing a hybrid gain medium [4], and using polarization hole burning (PHB) effect [5]. The liquid nitrogen method is not suitable for practical applications.…”

Tunable dual wavelength fiber laser incorporating AWG and optical channel selector by controlling the cavity loss

“…As a result of their compact size and their good cost-per-wavelength ratio, MWFLs and SWFLs have many potential applications in Dense Wavelength Division Multiplexing (DWDM) [1,2], optical sensing [3] and also optical spectroscopy [4]. Recently however, there has been increased focus on the development of dual wavelength laser sources (DWFLs), especially DWFLs with tunable channel spacing.…”