Abstract
We describe an optical sensor utilising a birefringent monomode fibre as the sensing element. The optical arrangement comprises a Mach-Zehnder and Michelson interferometer configured in tandem. A short coherence length source is used, and the path difference in one interferometer is balanced by the second. Measurand-induced changes in both polarisation state and phase are determined, thus extending the unambiguous measurement range over that of a simple interferometer. The inherently balanced optical arrangement reduces the effects of noise and drift in the optical frequency of the source. The device was demonstrated as a temperature sensor.
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