title: Selective excitation and coupling of high-order optical modes of a microstructured optical fiber by using a fiber-end microtip.
abstract: We present the selective excitation and coupling of high-order optical modes in microstructured optical fibers (MOFs) by using a fiber-end microtip. After the self-growing of a microtip on the end face of a standard single-mode fiber, it is demonstrated that a fine tuning of the relative displacement between the microtip and MOF can greatly improve the excitation and coupling efficiency of high-order optical modes of the MOF. A 6.85 dB improvement in coupling efficiency of the second-order mode of a homemade small-hole MOF is experimentally achieved, and a sensitivity-enhanced measurement of the refractive index in MOF microholes is demonstrated.
authors: Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, China.
authors: Yinbing
authors: Y
authors: Bai
authors: A Ping
authors: AP
authors: Zhang
authors: Guofeng
authors: G
authors: Yan
authors: Sailing
authors: S
authors: He