Abstract
The technique of optical time-domain reflectometry is
analyzed to determine the effect of an optical phase modulation on
light backscattered in an optical fiber. It is shown that the
spatial distribution along the fiber of an external phase modulation
can be measured with a spatial resolution close to that of optical
time-domain reflectometry. A distributed interferometric sensor
arrangement that employs this technique is investigated experimentally,
and a satisfactory interrogation of more than 1000 resolution intervals
is demonstrated.
© 1998 Optical Society of America
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