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Resolving the range ambiguity in OFDR using digital signal processing

Riesen, Nicholas; Lam, Timothy; Chow, Jong


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...[Show more]

CollectionsANU Research Publications
Date published: 2014
Type: Journal article
Source: Measurement Science and Technology
DOI: 10.1088/0957-0233/25/12/125102


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