Patent ID: 9287971
Filing Date: 2016-03-15
CPC Classification: G01M,H04B,H04Q

Claim Text:
1. A method in a Wavelength Adaptation Module for adapting an Optical Time Domain Reflectometry (OTDR) signal for supervision of Optical Network Terminals (ONTs) in a Passive Optical Network (PON), the method comprising: receiving an OTDR signal comprising at least one wavelength; Red/Blue (R/B) filtering the received OTDR signal; converting the filtered OTDR signal to a photoelectric current; amplitude modulating said photoelectric current and an optical signal having a pre-selected wavelength from a Continuous Wavelength light source, thereby producing an amplitude modulated signal having the pre-selected wavelength of said optical signal; and outputting said amplitude modulated signal towards a Remote Node (RN), wherein said wavelength of said optical signal has been pre-selected to enable a splitter in said RN to forward said amplitude modulated signal to a dedicated group of ONTs in the PON, thereby supervising fibre links between the RN and the dedicated group of ONTs, and wherein the OTDR signal and the optical signal having the pre-selected wavelength are received as a result of an alarm issued by an ONT belonging to said dedicated group of ONTs.