Abstract
A novel optical sensing of the multi-channel chaotic cross-correlation fiber loop ring down (FLRD) sensing is proposed and demonstrated experimentally. The proposed sensing system consist of the multiple FLRD sensors within a serial architecture. The chaotic laser was divided into reference signal and the detection signal by an optical coupler and measured the cross-correlation coefficient ring down time of chaotic signal to obtain the shorter response time. The three-channels FLRD chaotic signal are achieved by the cross correlation experimentally to verify the proposed concept. The simultaneous detection of temperature and refractive index is studied by the dual-channel experiment. The experimental results show that the high sensitivity of each channel can be achieved without interfering each other. We believe the proposed sensing system have great potential for short-distance and multi-point detection.
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