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

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

doi:10.1117/12.2577031

5 March 2021 Overcoming the OTDR dead-zone using a few-mode fiber

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

Proceedings Volume 11693, Photonic Instrumentation Engineering VIII; 116930Q (2021) https://doi.org/10.1117/12.2577031
Event: SPIE OPTO, 2021, Online Only

Abstract

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.

Conference Presentation

Citation Download Citation

Islam Ashry, Yuan Mao, Biwei Wang, Frode Hveding, Tien Khee Ng, and Boon S. Ooi "Overcoming the OTDR dead-zone using a few-mode fiber", Proc. SPIE 11693, Photonic Instrumentation Engineering VIII, 116930Q (5 March 2021); https://doi.org/10.1117/12.2577031

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