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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Secure fiber optic communication system based on the Sagnac interferometer

Eric Udd

Published Nov 12, 1996• 6 citations
Publisher

Abstract

The Sagnac interferometer may be used to support high speed secure fiber optic data links over distances of more than 10 km. This paper provides a description of the basic system and describes how it may be applied to campus and local area network applications.
DOI
10.1117/12.258175

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We introduce a stable, long-distance single- photon Sagnac interferometer, which has a balanced configuration to efficiently compensate phase drift caused by change of the fiber-optic path. By using time-division phase modulation, single-photon interference was realized at 1550 nm in a 5-km-long as well as 27-km-long Sagnac fiber loops, with a fringe visibility higher than 90% and long-term stability. The stable performance of the single-photon interference indicated that the time-division phase-modulated Sag- nac interferometer might readily lead to practical applications in single-photon routing and quantum cryptography.