Photon Counting OTDR : Advantages and Limitations

Details Photon Counting OTDR : Advantages and Limitations Photon Counting OTDR : Advantages and Limitations

2010-01-05

arxiv.org/abs/1001.0694v2

IEEE Journal of Lightwave Technology, Vol. 28, No. 6, 952-964, (2010)

Physics

Quantum Physics

12 pages, 13 figures, accepted for publication by IEEE Journal of Lightwave Technology

Scientific paper

10.1109/JLT.2009.2039635

We give detailed insight into photon counting OTDR (nu-OTDR) operation, ranging from Geiger mode operation of avalanche photodiodes (APD), analysis of different APD bias schemes, to the discussion of OTDR perspectives. Our results demonstrate that an InGaAs/InP APD based nu-OTDR has the potential of outperforming the dynamic range of a conventional state-of-the-art OTDR by 10 dB as well as the 2-point resolution by a factor of 20. Considering the trace acquisition speed of nu-OTDRs, we find that a combination of rapid gating for high photon flux and free running mode for low photon flux is the most efficient solution. Concerning dead zones, our results are less promising. Without additional measures, e.g. an optical shutter, the photon counting approach is not competitive.

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