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The performance of a coherent OTDR system operating at 1.3 µm is described. Two sources have been used -a Nd:YAG laser and a semiconductor laser with increased coherence. With the latter source, greater than 24 dB one way range has been achieved with accurate determination of fault magnitude.

Abstract-A background of activity is presented for signal processing as applied to, and used in, magnetic information storage systems. Specific examples are given of how current and previous research projects fit into the overall progress of research in this area. Arguments are presented as to why, in the distant future, information will be stored as "analogue" information rather than binary so methods and techniques will need to be developed to utilize the near-infinite capacity of such systems.

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