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Michelson interferometer
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===Step-phase interferometer=== This is a Michelson interferometer in which the mirror in one arm is replaced with a [[Gires–Tournois etalon]].<ref>{{cite journal|author=F. Gires |author2=P. Tournois |name-list-style=amp |date=1964|title=Interféromètre utilisable pour la compression d'impulsions lumineuses modulées en fréquence|journal=[[Comptes Rendus de l'Académie des Sciences de Paris]]|volume=258|pages=6112–6115}}</ref> The highly dispersed wave reflected by the Gires–Tournois etalon interferes with the original wave as reflected by the other mirror. Because the phase change from the Gires–Tournois etalon is an almost step-like function of wavelength, the resulting interferometer has special characteristics. It has an application in [[fiber-optic]] [[Telecommunication|communications]] as an [[optical interleaver]]. Both mirrors in a Michelson interferometer can be replaced with Gires–Tournois etalons. The step-like relation of phase to wavelength is thereby more pronounced, and this can be used to construct an asymmetric optical interleaver.{{Citation needed|date=June 2014}}
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