Interferometry Through Single-Mode Optical Fibers

G. L. Clark.; C. Roychoudhuri

doi:10.1117/12.957857

25 December 1979 Interferometry Through Single-Mode Optical Fibers

G. L. Clark., C. Roychoudhuri

Proceedings Volume 0192, Interferometry; (1979) https://doi.org/10.1117/12.957857
Event: 23rd Annual Technical Symposium, 1979, San Diego, United States

Abstract

A single-mode optical liner can De used as a leg of an interterometer, making possible new applications of interferometry. Since this kind of fiber does not allow higher-order modes to propagate, it acts as a spatial filter and provides a smooth wavefront at its output end. A practical method of providing optically good in-put and output faces for a fiber core only a few micrometers in diameter is described, including a means of stripping away cladding modes. The problem of coupling from a laser into a single-mode fiber is discussed, including optimal matching of a gaussian beam to the Bessel function field distribution of the HEll mode. Theoretical coupling efficiency can be as high as 99.7 percent, and experimental efficiency is 70 percent, not corrected for Fresnel reflections. Experimental results are presented showing the change in the optical length of a fiber with temperature and the use of single-mode fibers in two types of interferometer, a Fabry-Perot etalon and an unequal-path Mach Zehnder interferometer with 128 meters of optical fiber in one of the paths.

Citation Download Citation

G. L. Clark. and C. Roychoudhuri "Interferometry Through Single-Mode Optical Fibers", Proc. SPIE 0192, Interferometry, (25 December 1979); https://doi.org/10.1117/12.957857

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