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.
© 2007 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: October 3, 2006
Manuscript Accepted: January 7, 2007
Published: May 18, 2007
Shenggui Fu, Libin Si, Zhancheng Guo, Shuzhong Yuan, Ying Zhao, and Xiaoyi Dong, "Switchable multiwavelength ytterbium-doped double-clad fiber laser based on a multimode fiber grating," Appl. Opt. 46, 3579-3582 (2007)