Patent ID: 9112635
Filing Date: 2015-08-18
Classification: H04J

Abstract:
1. An access subnetwork node configured to form part of an access subnetwork and comprising one or more add-drop modules, each including one or more passive optical filters, wherein the one or more add-drop modules are configured to: selectively drop a fixed band of wavelength channels from the access subnetwork, via a passive directional coupler, to each of multiple client nodes that actively select to receive client-specific channels that a central office transmits within the fixed band to those client nodes, the central office connecting the access subnetwork to a metro network; and selectively add the fixed band of wavelength channels to the access subnetwork, as received via a passive directional coupler from the multiple client nodes that actively select to transmit client-specific channels within the fixed band towards the central office; wherein the one or more add-drop modules are configured to selectively add and drop the fixed band using one or more passive optical filters, wherein the one or more passive optical filters are non-tunable.