Abstract
We extend the Golay coded Optical Time Domain Reflectometry OTDR technique
for the first time from direct-detection to coherent OTDR, investigating the
unique issues arising in the coherent setting regarding signal processing
operations and efficient real-time implementation of the DSP in practical
coherent OTDR receivers and the resulting OTDR performance. We also derive
detailed signal flow block diagrams for direct-detection and coherent OTDRs
and use an intuitive analogy between spatial speckle and temporal coherent
fading noise to guide the selection of OTDR system parameters. We present
extensive simulations of the OTDR signal and noise flow accounting for all
major effects including the optical source coherence and the backscatter random
fading.
© 2013 IEEE
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