Low-Coherence Fiber Differential Interferometer With Adjustable Measurement Range


A coffee-coherence fiber differential interferometer with adjustable measurement range is presented during this letter. The interferometer is based on an all fiber Mach–Zehnder and Sagnac hybrid interferometer. Results show that the measurement vary of the differential interferometer is related to the delay fiber length, that can be adjusted by an optical switch. The experimental results demonstrate that the section demodulation resolution is $3.37times 10^-5$ rad and the utmost measuring amplitude is 419 rad with a proof frequency of one kHz. This theme will be used to live several types of parameters, such as vibration and electrical current.

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