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Frequency domain detection of coherence multiplexed sensor signals by using an optical loop with a frequency shifter

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2 Author(s)
Iiyama, K. ; Dept. of Electr. & Comput. Eng., Kanazawa Univ., Japan ; Hayashi, K.

We describe a frequency domain detection scheme of coherence multiplexed sensor signals by using an optical loop with a frequency shifter. The optical path differences of the sensors are adjusted to integer-multiple of the loop length of the optical loop, and then the the sensor signals are multiplexed in the frequency domain, appearing at the integer-multiple of the working frequency of the frequency shifter. In the experiment, four Michelson-type sensors are successfully multiplexed with the sensitivities of about 2 mrad/√Hz. The sensitivities are also theoretically calculated which are in good agreement with the experimental results. The optimum design of the optical loop is also discussed

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Lightwave Technology, Journal of  (Volume:15 ,  Issue: 11 )