25 October 2016 Detection and extraction of mixed signals in hybrid optical fiber sensing system
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Proceedings Volume 9686, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices; 96860H (2016) https://doi.org/10.1117/12.2242767
Event: Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), 2016, Suzhou, China
Abstract
A new hybrid optical fiber sensing system is proposed, which uses optical filter and coherent detection method to separate the mixed Rayleigh, Brillouin and Raman signal. In the sensing system the optical Raman signal is filtered out by corresponding optical fiber grating, and then by an optical local oscillator the optical Rayleigh and Brillouin signals are converted to radio frequency (RF) signals through a balanced photodetector (BPD) with two phase-inverse output ports. Then the Rayleigh RF from one output port of the BPD is filtered out by a RF filter with center frequency of 200MHz and bandwidth of 5MHz, and then the power of the RF Rayleigh signals are extracted by a RF power detector. And for the RF Brillouin signal extraction, a band pass filter with center frequency of 11.45GHz and bandwidth of 1.7GHz is used to filter the RF signals from the other output port of the BPD, so that the RF Brillouin signals are purified and then by a mixer and a sweeping RF source the details of the RF Brillouin spectra are characterized. The method can make the hybrid optical fiber sensing system more compact, and enhance the sensing performance, which benefits for the cost reduction.
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Lidong Lu, Lidong Lu, Liyu Zhou, Liyu Zhou, Xiaoyan Sun, Xiaoyan Sun, Xiande Bu, Xiande Bu, Binglin Li, Binglin Li, } "Detection and extraction of mixed signals in hybrid optical fiber sensing system ", Proc. SPIE 9686, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices, 96860H (25 October 2016); doi: 10.1117/12.2242767; https://doi.org/10.1117/12.2242767
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