Open AccessRayleigh-based OTDR with dynamic modal crosstalk suppression
Author(s) -
Hiroshi Takahashi,
Kunihiro Toge,
Tomokazu Oda,
Tetsuya Manabe
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.000783
Subject(s) - optics , optical time domain reflectometer , modal , rayleigh scattering , brillouin scattering , crosstalk , physics , offset (computer science) , twist , optical fiber , materials science , fiber optic sensor , polarization maintaining optical fiber , mathematics , computer science , polymer chemistry , programming language , geometry
We propose and demonstrate a novel approach for measuring the modal attenuation of the splice loss of a purely LP 11 mode group by using a Rayleigh-based OTDR with a dynamic modal crosstalk (XT) suppression technique for few-mode fibers (FMFs). With the proposed approach, the Brillouin loss interaction with a Brillouin Stokes beam co-propagating with the OTDR probe removes the modal XT caused at the modal conversion point and suppresses the accumulated modal XT that is detected. A preliminary experiment is demonstrated using spliced FMFs with a core-offset. Experiments revealed that the proposed technique can accurately measure the splice loss variations of a purely LP 11 mode group.