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Zero dead-zone OTDR with high-spatial resolution for short haul applications

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3 Author(s)
Feced, R. ; Dept. of Electron. & Electr. Eng., King''s Coll., London, UK ; Farhadiroushan, M. ; Handerek, V.A.

The existence of dead-zones is an important drawback for optical time-domain reflectometers (OTDR), specially in short haul applications with a large number of optical components. In this letter, we present an OTDR system with high spatial resolution based on the time-correlated single photon counting (TC-SPC) technique. This system overcomes the deadzone problem by monitoring the spontaneous Stokes Raman emission (SSRE) to avoid the intense Fresnel reflections. The high sensitivity of the TC-SPC technique (-120 dBm) permits a high-loss budget within reasonable measurement integration times.

Published in:

Photonics Technology Letters, IEEE  (Volume:9 ,  Issue: 8 )