title: Switchable multiwavelength ytterbium-doped double-clad fiber laser based on a multimode fiber grating.
abstract: A simple switchable multiwavelength double-clad fiber laser using a multimode fiber Bragg grating (MMFG) as a wavelength selective component is demonstrated. The MMFG is fabricated directly in the active double-clad fiber, resulting in low splicing loss and compact configuration. By properly adjusting the polarization controller in the cavity, the double-clad fiber laser can stably operate at different multiwavelength states at room temperature. At lower pump levels, the laser can be switched between single- and dual-wavelength operations, while at higher pump levels the laser can switch between dual- and triple-wavelength operations. The slope efficiency of the system is 41% with the maximum output power of 6.2 W.
authors.affiliation: College of Information Technical Science, Nankai University, Tianjin, China. fushenggui@gmail.com
authors.forename: Shenggui
authors.initials: S
authors.lastname: Fu
authors.forename: Libin
authors.initials: L
authors.lastname: Si
authors.forename: Zhancheng
authors.initials: Z
authors.lastname: Guo
authors.forename: Shuzhong
authors.initials: S
authors.lastname: Yuan
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhao
authors.forename: Xiaoyi
authors.initials: X
authors.lastname: Dong