Abstract
A novel fiber optical reflectometry is proposed for long distance measurements
and sensing applications. The reflectrometric information is included in the phase
difference of two interfering light beams reflected at the same scattering point on the
fiber under test (FUT). The reflection position and local information can be determined
by modulating the frequency difference and analyzing the reflecting signal in frequency
domain. Theoretical analysis and experimental demonstration are presented. Two adjacent
reflection points 50 km away from the reflectometry with a gap of 11 meters between each
other is distinguished. It is estimated that the operating range could be over 500 km
theoretically by employing a light source with 0.3 nm bandwidth. This novel
reflectometry is applied as a fiber Bragg grating interrogation solution as an example.
© 2010 IEEE
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