Abstract

We report the realization of a three-path Mach–Zehnder interferometer using single-mode fibers and two integrated 3 × 3 fiber couplers. We observed enhanced phase sensitivity, as compared with two-path interferometers, with a visibility of the interference pattern of more than 97%. This interferometer has an analog in two-photon interferometry, and we believe it to be the first nontrivial example of N × N multiport interferometers.

© 1996 Optical Society of America

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