We investigate new types of mode recouplings in a concatenated grating structure comprising a long-period grating and a fiber Bragg grating. It is demonstrated that the light coupled out to the cladding mode by one of these gratings can be recoupled back to the guided mode by the other grating. Theoretical analysis based on the coupled-mode theory is presented, together with experimental results.
© 2002 Optical Society of America
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2430) Fiber optics and optical communications : Fibers, single-mode
(230.1480) Optical devices : Bragg reflectors
(350.2770) Other areas of optics : Gratings
A-Ping Zhang, Xiao-Ming Tao, Weng-Hong Chung, Bai-Ou Guan, and Hwa-Yaw Tam, "Cladding-mode-assisted recouplings in concatenated long-period and fiber Bragg gratings," Opt. Lett. 27, 1214-1216 (2002)