Patent ID: 8660426
Filing Date: 2014-02-25
Classification: H04B

Abstract:
1. A method for determining an OSNR (OSNR real ) of a real optical signal being carried in an optical network link, the method comprising: tapping a portion of the real optical signal; altering the tapped signal portion by adding to it an in-band artificial noise signal, thus obtaining a combined signal; scattering the combined signal by a stimulated Brillouin scattering (SBS) or a stimulated Raman scattering (SRS) in an optical element; extracting a signal back reflected by the SBS or the SRS from the optical element; determining an OSNR deriving the OSNR wherein the OSNR where OPcNR=Pc/Padd, Pc is power of the real optical signal, Padd is power of the added artificial noise, and B