5 March 1993 Balanced differential two-mode elliptical-core optical fiber interferometer
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Proceedings Volume 1795, Fiber Optic and Laser Sensors X; (1993) https://doi.org/10.1117/12.141247
Event: Fibers '92, 1992, Boston, MA, United States
Abstract
We propose a phase delay balanced two-mode fiber interferometer, which consists of two sections of two-mode, elliptical-core (e-core) fibers of the same length. These two fibers are fusion spliced together in such a way that there is a radius offset along their major or minor axes. We refer these two fibers as the sensing and reference fibers, respectively. Each of the LP01 and LP11even modes of the sensing fiber excites the LP01 and LP11even modes in the reference fiber. By launching a short coherence light into this sensing-reference fiber system, the original phase delay difference between LP01 and LP11even modes in the sensing fiber can be balanced. The unique feature of this sensor is that the temperature coefficient is expected to be at least two orders of magnitude smaller than that of a conventional e-core two-mode fiber sensor. Because of the compensation effect, phase noise caused by the frequency fluctuation of the light source may become negligible.
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Anbo Wang, George Z. Wang, K. C. Ravikumar, Kent A. Murphy, Richard O. Claus, "Balanced differential two-mode elliptical-core optical fiber interferometer", Proc. SPIE 1795, Fiber Optic and Laser Sensors X, (5 March 1993); doi: 10.1117/12.141247; https://doi.org/10.1117/12.141247
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