Patent ID: 9419708
Filing Date: 2016-08-16
CPC Classification: G01M,H04B,H04J

Claim Text:
1. A method of analysing performance of an optical fiber link, the method comprising: deriving a reference trace indicative of a distributed optical performance of the optical fiber link; during an initial deployment of the optical fiber link, measuring, by an Optical Time Domain Reflectometry (OTDR) sub-system, a first OTDR trace of the optical fiber link with Raman amplification ON; and during in-service operation of the optical fiber link, measuring, by the OTDR sub-system, a second OTDR trace with Raman amplification ON; and detecting, by a computer, a change in optical characteristics of the optical fiber link since the first cumulative Raman Grain profile was generated, base on the reference trace, the first OTDR trace and the second OTDR trace.