title: Multi-core fiber interferometer using spatial light modulators for measurement of the inter-core group index differences.
abstract: We demonstrate an experimental technique to generate and measure arbitrary superpositions of core modes in a multi-core fiber. Two spatial light modulators couple the fundamental mode of a single-mode fiber with multiple-core modes of the MCF to constitute a Mach-Zehnder-type multi-path interferometer. The phase tunability of each path is verified by comparing two-, three-, and four-path interference patterns with the theory. Interference fringes in the wavelength domain estimates the inter-core group index differences with a resolution of 10(-5) using a fiber length of 1 m.
authors.forename: Hee Jung
authors.initials: HJ
authors.lastname: Lee
authors.forename: Han Seb
authors.initials: HS
authors.lastname: Moon
authors.forename: Sang-Kyung
authors.initials: SK
authors.lastname: Choi
authors.forename: Hee Su
authors.initials: HS
authors.lastname: Park