Abstract
This paper presents a wavelength coded optical time-domain reflectometry
based on optical heterodyne technique. In this scheme, the probe and
reference optical pulses have different wavelengths. This enables optical
heterodyne detection to be used to improve the system performances
significantly. We demonstrate a spatial resolution of 2.5 m within a range
of 60 km in weak-reflection signal detection and direct observation of
Brillouin scattering over a long optical fiber, suggesting online fiber
sensing possible. The principle of wavelength coding is applicable to other
systems like lidar and radar to increase receiver sensitivity and simplify
system structure.
© 2010 IEEE
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