Single-Longitudinal-Mode Dual Wavelength-Switchable Fiber Laser Based on Superposed Fiber Bragg Gratings

Abstract

In this work, a simple switchable dual-wavelength short-cavity fiber laser operating in a single-longitudinal-mode regime at room temperature and based on superposed fiber Bragg gratings is proposed and experimentally demonstrated. Only by introducing stress into one of the overwritten FBGs, single-or dual-wavelength laser oscillations can be attained. Either single-or multimode operation of the laser can be easily achieved. Single-longitudinal-mode emission has been verified in two different ways: the first corroboration has been conducted by the heterodyne detection of the output signal, and the second one has been carried out by using a high-resolution optical spectrum analyzer.

Switchable dual-wavelength erbium-doped fibre laser utilizing two-channel fibre Bragg grating fabricated by femtosecond laser

“…Fibre gratings are ideal components to select lasing wavelength for fibre laser due to the full compatibility with fibre, many fibre gratings based schemes for multiwavelength fibre laser have been proposed, such as using long period grating (LPG) or large angle tilted fibre grating as polarization dependent loss element [11,12], turning the central wavelengths of the gratings to match or mismatch the selected lasing wavelengths [13,14], in fibre Lyot filter based on 45° tilted fibre Bragg gratings(FBGs) [15], cascaded long period gratings [16,17], fibre gratings in Sagnac loop mirrors [18,19], and use of gratings in special fibres [20][21][22].…”

All-Optical Modulation Characteristics of a Microfiber Coupler Combined Sagnac Loop

“…[5]- [8], the output power of Port 1 will decrease and that of Port 2 will increase under the modulation of the pump light. The modulation efficiency is proportional to α, η, and I P , and inversely proportional to r.…”

A Selectable Single-Mode Erbium Fiber Laser With Mach-Zehnder Interferometer and Rayleigh Injection Scheme

“…However, the EDF ring lasers with stable single-longitudinal-mode (SLM) operation will be hard to accomplish principally because of the long fiber cavity and the dense multi-longitudinal-mode (MLM) oscillation induced by the homogenous broadening effect of EDF [6], [7]. To ensure and reach the SLM action in the EDF ring fiber laser with advantageous output performance, numerous methods have been operated in the fiber ring cavity, such as using the Mach-Zehnder interferometer (MZI) scheme [8], saturable absorber (SA) based filter [9], [10], Rayleigh backscattering (RB) injection [11], compound fiber ring configuration [12], [13], and narrower optical filter [14], [15]. Chien-Hung Yeh, Li-Hung Liu, Han-Shin Ko, and Yi-Ting Lai are with the Department of Photonics, Feng Chia University, Taichung 407802, Taiwan (e-mail: yeh1974@gmail.com; jk1992581@gmail.com; xzbc699@gmail.com; laietn@gmail.com).…”