18687877. Method and Apparatus for Performing Optical Time Domain Reflectometry on an Optical Fibre (Telefonaktiebolaget LM Ericsson (publ))

Method and Apparatus for Performing Optical Time Domain Reflectometry on an Optical Fibre

Organization Name

Telefonaktiebolaget LM Ericsson (publ)

Inventor(s)

Sergio Mosti of Genova IT

Alberto Deho of Genova IT

Roberto Magri of Genova IT

Davide Sanguinetti of Genova IT

[[:Category:Claudio D'inc� of Genova IT|Claudio D'inc� of Genova IT]][[Category:Claudio D'inc� of Genova IT]]

Method and Apparatus for Performing Optical Time Domain Reflectometry on an Optical Fibre

This abstract first appeared for US patent application 18687877 titled 'Method and Apparatus for Performing Optical Time Domain Reflectometry on an Optical Fibre

Original Abstract Submitted

The present application relates to a method for performing optical time domain reflectometry (OTDR) on an optical fibre. The method comprises: a) setting () a decision threshold of a photodetector; b) transmitting () a first signal into an optical fibre, wherein the first signal comprises a sequence of optical radiation pulses based on a coded sequence; c) detecting () optical radiation backscattered and/or reflected from the optical fibre using the photodetector; d) obtaining () a measurement signal comprising bit sequences based on the detected optical radiation and the decision threshold of the photodetector; e) comparing () the measurement signal with the first signal to obtain a correlation signal; f) adjusting () the decision threshold of the photodetector; g) repeating () steps (b)-(f) to obtain a plurality of correlation signals; and e) combining () the plurality of correlation signals to obtain an OTDR trace of the optical fibre. The present application also relates to a computer program product, an apparatus for performing OTDR, an optical plug and a fibre optic system.