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.

Mach-Zehnder modulator

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mach-zehnder interferometer pdf

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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.

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Mach-Zehnder interferometer

Jinfang Wang, Yundong Zhang, Xuenan Zhang, He Tian, Hao Wu, Yuanxue Cai, Jing Zhang, and Ping Yuan Opt. Lett. 36(16) 3173-3175 (2011)

B. K. Nayar, N. Finlayson, N. J. Doran, S. T. Davey, D. L. Williams, and J. W. Arkwright Opt. Lett. 16(6) 408-410 (1991)

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