Abstract
This paper reviews recent developments in distributed fiber optic sensing systems
(DFOSS) employing optical time domain reflectometry (OTDR), polarization optical time
domain reflectometry (POTDR), and frequency domain reflectometry (OFDR) techniques. Such
systems can time - and/or frequency multiplex a large number of sensors distributed along
an optical fiber, and offer unique advantages over conventional multiplexed sensing
technology.
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