Abstract

It is generally assumed that fiber interferometers must be constructed from single-mode fibers. An alternative is to employ phase conjugation mirrors on the arms of a multimode fiber interferometer so that the spatial scrambling of modes is reversed, and good fringe contrast is maintained. When several interferometers all share the same self-conjugating BaTiO3 crystal, however, the results show crosstalk between the separate fibers ranging from negligible to prohibitively large depending on the precise spatial configuration within the conjugator. A model accounting for these results is proposed. In addition it was observed in control experiments with conventional Mach-Zehnder configurations that good data could be obtained despite reduced contrast with both graded and step index multimode fibers.

© 1991 Optical Society of America

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