title: Resonant coupling in trenched bend-insensitive optical fiber.
abstract: We report in this Letter the resonant coupling mechanism in bending trenched bend-insensitive fiber (BIF). It is found that among the trench parameters, the core-trench distance is predominant for optimized BIF design. We reveal that resonant coupling is an intrinsic characteristic of bending trenched BIF, and resonant coupling between the fiber core and the innermost cladding would limit the ultimate bending loss of BIF under tight bend. Resonant coupling is also present in double-trenched BIF, and would impair its bending performance.
authors: Key Laboratory of All Optical Network & Advanced Telecommunication Network of EMC, Beijing Jiaotong University, Beijing 100044, China. gbren@bjtu.edu.cn
authors: Guobin
authors: G
authors: Ren
authors: Zhen
authors: Z
authors: Lin
authors: Siwen
authors: S
authors: Zheng
authors: Shuisheng
authors: S
authors: Jian