Patent ID: 9673895
Date: 2017-06-06
CPC Classifications: G01M,H04B,H04L

Claim:
1. A method in a Remote Node (RN) in a Passive Optical Network (PON), the PON comprising Optical Network Terminals (ONTs) and a Wavelength Adaptation Module arranged in a fibre path between an Optical Time Domain Reflectometry (OTDR) device and said RN, the RN comprising a passive splitter arrangement, wherein said passive splitter arrangement comprises a multi-stage splitter, the method comprising: receiving a data information signal from an Optical Line Terminal (OLT) in the PON; receiving an OTDR signal having a selected wavelength from said Wavelength Adaptation Module; inserting said data information signal into a first splitter stage of said multi-stage splitter, wherein a splitter in the first splitter stage of said multi-stage splitter forwards said data information signal on to a second splitter stage of said multi-stage splitter; inserting said received OTDR signal having the selected wavelength into the second splitter stage of said multi-stage splitter such that said OTDR signal having the selected wavelength bypasses the first splitter stage of said multi-stage splitter; and outputting said OTDR signal having the selected wavelength to a dedicated group of ONTs from the ONTs in the PON with regards to the selected wavelength of said received OTDR signal.