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23 October 2018 Demodulation of multilongitudinal mode fiber-laser sensor based on undersampling technique
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An innovative demodulation system for multilongitudinal mode fiber laser sensor has been proposed. By using a bandpass filter and a low-speed analog-to-digital converter (ADC), the high-frequency sensing signal can be downconverted and sampled simultaneously when the unaliasing condition is satisfied. Since the MLM fiber laser sensor could generate a wideband electrical signal after optical-to-electrical conversion, it is convenient to filter the signal to meet the unaliasing condition by a tunable bandpass filter while keeping the sample rate unchanged. Moreover, each tone of the beating frequency signal has the full information for demodulation of measurand. The demodulation system only needs a bandpass filter and a low-speed ADC which reduces the cost of the system and make the system more stable. A proof-of-concept experiment is conducted to verify the proposed scheme. Eventually by demodulating a beat frequency in 1.625GHz, a sensitivity of -5.87kHz/°C is achieved in a fiber laser sensing system with a sample rate of 500MHz.
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Shangjing Liu, Long Huang, Pan Dai, Runze Liu, and Xiangfei Chen "Demodulation of multilongitudinal mode fiber-laser sensor based on undersampling technique", Proc. SPIE 10821, Advanced Sensor Systems and Applications VIII, 108210X (23 October 2018);

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