Journal
OPTICS EXPRESS
Volume 23, Issue 26, Pages 33241-33248Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.033241
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [NRF-2015R1A2A2A01007078]
- Civil-Military Integration Project - National Research Council of Science & Technology (NST) [CMP-13-01-KRISS]
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Large increase of effective sensing points in Brillouin optical correlation domain analysis (BOCDA) is achieved by simultaneously applying double modulation and optical time gate based on differential measurement scheme. The noise substructure of Brillouin gain spectrum induced by the double modulation is effectively suppressed by the differential measurement, leading to 2,000 times enlargement of the measurement range. Distributed strain and temperature sensing along a 10.5 km fiber with spatial resolution of less than 1 cm is experimentally demonstrated which corresponds to over 1 million effective sensing points. (C) 2015 Optical Society of America
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