A strain-induced birefringence double-clad (DC) fiber Bragg grating (FBG) is proposed and demonstrated. The grating is fabricated in the core of rectangular inner cladding double clad fiber by using phase mask method. By applying lateral strain on the grating, the birefringence is induced. In order to detect the birefringent effect of the grating, we use it as the output mirror of a laser. When lateral strain is applied, the grating becomes birefringent. Therefore, one reflection peak of double-clad fiber Bragg grating becomes two peaks and the laser also lases in two wavelengths. The wavelength spacing of the laser can be tuned from 0 to 0.8 nm. The absolute wavelengths for the two polarizations can be tuned 1.2 and 2.0 nm, respectively.
© 2005 Chinese Optics Letters
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(140.3440) Lasers and laser optics : Laser-induced breakdown
(140.3510) Lasers and laser optics : Lasers, fiber
Lijun Li, Lei Sun, Wande Fan, Zhi Wang, Jianhua Luo, Shenggui Fu, Shuzhong Yuan, and Xiaoyi Dong, "A strain-induced birefringent double-clad fiber Bragg grating," Chin. Opt. Lett. 3, 383-385 (2005)