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OPTICAL FIBER RETROREFLECTING SENSORS NETWORK

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Abstract

The use of Optical Time Domain Reflectometry (OTDR) is well established for monitoring the local attenuation along a fiber line, through the variation of backscattered light. This technique has been applied to the multiplexing of lossy optical transducers along a single fiber, providing thus a simple way of achieving an optical fiber sensors network [1]. The capabilities of these networks have been demonstrated with microbend-loss inducing transducers, as well as with bend-loss inducing transducers [2]. However, these lossy mechanisms are rather limited in terms of the number of sensors which can be multiplexed along a single fiber. The backscattering coefficient in a typical multimode fiber is usually less than 10−4 and it even decreases proportionally to the light pulse width. This means that the light signal which is available for making the measurement is only 0.01 % of the light power lost in the transducer.

© 1986 Optical Society of America

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