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Proceedings Paper

Code length limit in phase-sensitive OTDR using ultralong (>1M bits) pulse sequences due to fading induced by fiber optical path drifts
Author(s): H. F. Martins; K. Shi; B. C. Thomsen; S. Martin-Lopez; M. Gonzalez-Herraez; S. J. Savory
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Paper Abstract

Recently, it has been demonstrated that by recovering the amplitude and phase of the backscattered optical signal, a ΦOTDR using pulse coding can be treated as a fully linear system in terms of trace coding/decoding, thus allowing for the use of tens of thousands of bits with a dramatic improvement of the system performance. In this communication, as a continuation of previous work by the same authors, a preliminary study aiming at characterizing the limits of the system in terms of maximum usable code length is presented. Using a code exceeding 1million bits over a duration of 0.26ms, it is observed that fiber optical path variations exceeding ≈π occurring over a time inferior to the pulse code length can lead to localized fading in the ΦOTDR trace. The occurrence, positions and form of the fading points along the ΦOTDR trace is observed to be strongly dependent on the type, frequency and amplitude of the perturbations applied to the fiber.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103235W (23 April 2017); doi: 10.1117/12.2263117
Show Author Affiliations
H. F. Martins, FOCUS S. L. (Spain)
K. Shi, Univ. College London (United Kingdom)
B. C. Thomsen, Univ. College London (United Kingdom)
S. Martin-Lopez, Univ. de Alcalá (Spain)
M. Gonzalez-Herraez, Univ. de Alcalá (Spain)
S. J. Savory, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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