Patent ID: 8861957
Filing Date: 2014-10-14
Classification: H04J

Abstract:
1. A system for use in an optical access network, the access network comprising L wavelength division multiplexed access sub-networks, where L≧2, each of the wavelength division multiplexed access sub-networks arranged to use a set of wavelength channels and having an optical link for carrying a signal comprising a multiplexed set of the wavelength channels, the system comprising: M optical line termination apparatus, where M≧1, each for receiving traffic from a respective operator network and for outputting traffic on the wavelength channels; a wavelength routing apparatus comprising M sets of first ports and L second ports, each set of first ports for connecting to a respective one of the optical line termination apparatus and each second port for connecting to an optical link of a respective one of the wavelength division multiplexed access sub-networks, the wavelength routing apparatus being arranged to route the wavelength channels between the sets of first ports and the second ports and to route different wavelength channels of the same wavelength to different ones of the second ports.