Abstract
The optical time-domain reflectometer (OTDR) is the standard equipment for detecting faults in optical fiber. However, the dynamic range of an OTDR decreases significantly with spatial resolution.1 The best dynamic range for a resolution of 10 m is 20 dB. For effective use of the OTDR in fault detection in a fiber network, the dynamic range and spatial resolution need to be improved. Thus, coherent OTDR2 and various versions of frequency-domain reflectometry3-5 have been subjects of investigation.
© 1995 Optical Society of America
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