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Applied Optics

Applied Optics


  • Vol. 34, Iss. 13 — May. 1, 1995
  • pp: 2350–2353

Differentiating optical-fiber Mach–Zehnder interferometer

Stephanus J. Spammer and Pieter L. Swart  »View Author Affiliations

Applied Optics, Vol. 34, Issue 13, pp. 2350-2353 (1995)

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We introduce a new type of optical-fiber Mach–Zehnder interferometer whose output depends on phase differentials or the time rate of change of the unknown phase-modulating signal. Whereas the actual phase excursion introduced by the signal could cause interference over several fringes in a conventional Mach–Zehnder interferometer, the differential phase shifts may be restricted to the linear range of the phase detector. Being of simple construction, the interferometer can be operated without active biasing, additional phase modulation, or complex signal-processing techniques. We analyze a prototype architecture to explain the principle of operation of the system and to derive design formulas. This is followed by experimental evaluation of a more practical configuration.

© 1995 Optical Society of America

Original Manuscript: June 22, 1994
Published: May 1, 1995

Stephanus J. Spammer and Pieter L. Swart, "Differentiating optical-fiber Mach–Zehnder interferometer," Appl. Opt. 34, 2350-2353 (1995)

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