Overcoming the OTDR dead-zone using a few-mode fiber

Islam Ashry, Yuan Mao, Biwei Wang, Frode Hveding, Tien Khee Ng, Boon S. Ooi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Optical-time-domain-reflectometer (OTDR) suffers from the existence of dead-zones along a deployed fiber under test (FUT). Within a dead-zone, OTDR typically fails to provide any reliable diagnostic information. We here use a fewmode fiber (FMF) to completely cancel the OTDR dead-zone produced by the front facet reflection of the FUT. In particular, we launch the optical pulses in the form of the LP01 mode into the FMF, and meanwhile we record the Rayleigh signal from the higher-order modes. The developed system successfully monitors the amplitude and frequency of a vibration event produced by a piezoelectric transducer (PZT) located within the dead-zone.
Original languageEnglish (US)
Title of host publicationPhotonic Instrumentation Engineering VIII
ISBN (Print)9781510642218
StatePublished - Mar 5 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-12-14


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