Novel Signal Processing Techniques For Enhanced OTDR Sensors

J. K.A. Everard

doi:10.1117/12.941083

14 October 1987 Novel Signal Processing Techniques For Enhanced OTDR Sensors

J. K.A. Everard

Proceedings Volume 0798, Fiber Optic Sensors II; (1987) https://doi.org/10.1117/12.941083
Event: Fourth International Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, The Hague, Netherlands

Abstract

This paper will describe techniques which should greatly reduce the signal averaging times required in conventional distributed Optical Time Domain Reflectometry (OTDR) sensor systems. The technique does not require coherent detection and spectral analysis as is currently used in FMCW or FMAMCW. A digitally generated pseudo-random noise sequence is modulated on to a light source and transmitted down an optical fibre. The received backscattered signal is then correlated (multiplied) with a delayed version of the transmitted sequence to evaluate the amplitude of the backscattered signal at a given point along the fibre. The average transmitted and received signal power is therefore increased allowing reduced signal averaging times or reduced peak laser powers to be used compared with conventional OTDR systems.

Citation Download Citation

J. K.A. Everard "Novel Signal Processing Techniques For Enhanced OTDR Sensors", Proc. SPIE 0798, Fiber Optic Sensors II, (14 October 1987); https://doi.org/10.1117/12.941083

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