A SYSTEM, A WAVELENGTH ISOLATOR AND METHODS THEREIN FOR SUPERVISION OF A PASSIVE OPTICAL NETWORK

摘要

A system, a wavelength isolator and methods therein for supervision of a passive optical network are provided. The system comprises an OTDR device, generating N+1 OTDR signals of wavelengths lambda0-lambdaNu, and transmitting the signals towards ONUs. The system comprises a splitter having N output branches, wherein an input of the splitter is connected to the output of the OTDR device and the output branches of the splitter are indirectly connected to the ONUs, wherein the splitter splits the OTDR signals and forwards them towards the ONUs. The system comprises a wavelength isolator having inputs connected to the splitter output branches, the wavelength isolator isolates, on individual inputs, one predetermined wavelength of the received OTDR signals per individual input, wherein two inputs of the wavelength isolator do not isolate the same wavelength, and forwards, from each of the inputs of the wavelength isolator, the OTDR signals to associated outputs towards the ONUs, which are connected to the wavelength isolator by individual fibre links.