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|Scopus||Web of Science®||Altmetric|
|Title:||Resolving the range ambiguity in OFDR using digital signal processing|
|Citation:||Measurement Science and Technology, 2014; 25(12):125102-1-125102-6|
|Nicolas Riesen, Timothy T-Y Lam and Jong H Chow|
|Abstract:||A digitally range-gated variant of optical frequency domain reflectometry is demonstrated which overcomes the beat note ambiguity when sensing beyond a single frequency sweep. The range-gating is achieved using a spread spectrum technique involving time-stamping of the optical signal using high-frequency pseudorandom phase modulation. The reflections from different sections of fiber can then be isolated in the time domain by digitally inverting the phase modulation using appropriately-delayed copies of the pseudorandom noise code. Since the technique overcomes the range ambiguity in OFDR, it permits high sweep repetition rates without sacrificing range, thus allowing for high-bandwidth sensing over long lengths of fiber. This is demonstrated for the case of quasi-distributed sensing.|
|Keywords:||Fiber sensing; FMCW; metrology; optical frequency domain reflectometry; range ambiguity|
|Rights:||© 2014 IOP Publishing Ltd. Printed in the UK|
|Appears in Collections:||Aurora harvest 4|
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