Sensing within the OTDR dead-zone using a two-mode fiber

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

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


An optical time-domain reflectometer (OTDR) is incapable of providing sensing or diagnostic information within dead-zones. We use a two-mode fiber (TMF) and a photonic lantern to completely overcome the main OTDR's dead-zone originating from the front facet of optical fiber. This is achieved by injecting the optical pulses of the OTDR in the form of the fundamental LP01 mode and meanwhile collecting the Rayleigh signals associated with the higher-order modes. Using the reported TMF-based OTDR, we accurately sense the position and frequency of a vibration event located within the dead-zone as a proof-of-concept demonstration.
Original languageEnglish (US)
Pages (from-to)2969-2972
Number of pages4
JournalOptics Letters
Issue number11
StatePublished - Apr 20 2020


Dive into the research topics of 'Sensing within the OTDR dead-zone using a two-mode fiber'. Together they form a unique fingerprint.

Cite this