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 LP<SUB>01</SUB> and LP<SUB>11</SUB><SUP>even</SUP> modes of the sensing fiber excites the LP<SUB>01</SUB> and LP<SUB>11</SUB><SUP>even</SUP> modes in the reference fiber. By launching a short coherence light into this sensing-reference fiber system, the original phase delay difference between LP<SUB>01</SUB> and LP<SUB>11</SUB><SUP>even</SUP> 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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