Sensing with a LP/sub 01/-LP/sub 02/ intermodal interferometer

LP/sub 01/-LP/sub 02/ intermodal interference in a conventional communication optical fiber has been studied theoretically and experimentally. The visibility of the interferometer and its dependence on the detection scheme and the relative excitation efficiencies of the LP/sub 01/ and LP/sub 02/ modes have been theoretically considered under the assumption of a Gaussian modal distribution. The results of the experimental investigation of the response to longitudinal strain, temperature, and hydrostatic pressure are reported.<
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