Correlation-Optical-Time-Domain-Reflectometry For High Resolution Distributed Fiber-Optic Sensing

Jean-Jacques Bernard; Emmanuel Depresles

doi:10.1117/12.942508

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23 March 1988 Correlation-Optical-Time-Domain-Reflectometry For High Resolution Distributed Fiber-Optic Sensing

Jean-Jacques Bernard, Emmanuel Depresles

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Proceedings Volume 0838, Fiber Optic and Laser Sensors V; (1988) https://doi.org/10.1117/12.942508
Event: Cambridge Symposium on Fiber Optics and Integrated Optoelectronics, 1987, Cambridge, MA, United States

Abstract

Distributed fiber-optic sensing systems require a spatial resolution of less than one meter, which cannot easily by reached by conventional optical-time-domain-reflectometry (OTDR), because of present electronics response times limited to about 10 ns. Correlation-Optical-Time-Domain-Reflectometry (COTDR) is a powerful technique for high resolution test of distributed single-mode fiber sensors in the long wavelength range 1.3-1.6μm. This paper describes the realization of a 1.3μm COTDR using a 200 Mb/s pseudo-random sequence which allows a spatial resolution of 50 cm, and gives results obtained on a short single-mode fiber length with localized defects simulating a distributed line of sensors.

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Jean-Jacques Bernard and Emmanuel Depresles "Correlation-Optical-Time-Domain-Reflectometry For High Resolution Distributed Fiber-Optic Sensing", Proc. SPIE 0838, Fiber Optic and Laser Sensors V, (23 March 1988); https://doi.org/10.1117/12.942508

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