The highly Ge-doped photosensitive fiber (PSF) has been widely used in the fabrication of fiber Bragg gratings (FBGs). Its birefringence and cladding mode coupling characteristics greatly influence FBG's transmission feature in communication application areas. In this work, a new concept of the PSF is introduced which, along with an optimized birefringence design, a precisely controlled fabrication process, and a cladding mode depressed design, results in a written FBG with -25-dB clad mode-depressed ratio and a polarization mode dispersion value less than 0.045 ps.
© 2010 Chinese Optics Letters
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings
(060.3738) Fiber optics and optical communications : Fiber Bragg gratings, photosensitivity
Feng Tu, Deming Liu, Jie Luo, Xinwei Qian, Chen Yang, and Tao Deng, "Low birefringence depressed cladding photosensitive fiber," Chin. Opt. Lett. 8, 4-6 (2010)