Electronic Resource
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
59 (1991), S. 2483-2485
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
This letter shows theoretically and experimentally that Fresnel end reflection of the waveguide under test degrades the sensitivity of low coherence optical time domain reflectometry (OTDR). Optical mixing of end reflection and reference light in the OTDR produces the phase noise in proportion to end reflectivity. With the balanced detection technique, the excess photon noise is subdued and the phase noise becomes the dominant source of sensitivity degradation. At 3.2% end reflection and 300 μA mean photocurrent, the noise floor due to the phase noise is −138 dB/Hz. By reducing the fiber end reflection with matching oil, a shot-noise limited sensitivity of −140 dB at a 3 Hz bandwidth has been demonstrated at submillimeter resolution.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.105981
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