Balanced differential two-mode elliptical-core optical fiber interferometer

Anbo Wang; George Z. Wang; K. C. Ravikumar; Kent A. Murphy; Richard O. Claus

doi:10.1117/12.141247

5 March 1993 Balanced differential two-mode elliptical-core optical fiber interferometer

Anbo Wang, George Z. Wang, K. C. Ravikumar, Kent A. Murphy, Richard O. Claus

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 LP₁₁^even modes of the sensing fiber excites the LP₀₁ and LP₁₁^even 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 LP₁₁^even 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.

Citation Download Citation

Anbo Wang, George Z. Wang, K. C. Ravikumar, Kent A. Murphy, and Richard O. Claus "Balanced differential two-mode elliptical-core optical fiber interferometer", Proc. SPIE 1795, Fiber Optic and Laser Sensors X, (5 March 1993); https://doi.org/10.1117/12.141247

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