Novel Structure for Q-switched Er-doped Fiber Laser using a Fiber Grating Michelson Interferometer

摘要

Introduction:The simplicity,ruggedness and ability to readily integrate make fiber Bragg gratings an attractive choice for various applications in optical fiber communication systems and fiber sensors. Recently,cw single[ 1 ] or multi-wavelength [2] erbium-doped fiber lasers using fiber gratings as cavity mirrors have been demonstrated. A Q-switched fiber laser with fiber grating as wavelength selecting element was reported by Lees [3]. Such Q-switched fiber laser usually contained an air path where a bulk electro-optic [4] or acoustooptic modulators [3,5] was inserted for realizing Q-switching operation. This structure required precise position alignments for bulk components and may introduce large cavity loss resulting in high pump power threshold. In this letter we report a novel Q-switched Erdoped fiber laser with an all-fiber configuration based on a fiber grating Michelson interferometer (FGMI) that serves as not only wavelength selecting but also Q-switching element.