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Type: Journal article
Title: Resolving the range ambiguity in OFDR using digital signal processing
Author: Riesen, N.
Lam, T.
Chow, J.
Citation: Measurement Science and Technology, 2014; 25(12):125102-1-125102-6
Publisher: IOP Publishing
Issue Date: 2014
ISSN: 0957-0233
Statement of
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
DOI: 10.1088/0957-0233/25/12/125102
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