Method apparatus network and system for establishing an optical communication link for wavelength division multiplexing transmission

摘要

The present invention describes an optical line termination (OLT1, OLT2), an optical network unit (ONU1, .., ONU7), an optical network (1000) as well as a system and a method for establishing an optical communication link for wavelength division multiplexing transmission and providing a plug and play scheme. In particular an optical line termination (OLT1, OLT2) broadcasts on a dedicated communication channel preferably unidirectional using all available communication bandwidth, wavelength information about available communication channels/wavelengths as wavelength subsets to optical network units. Because all transmission channels are used, an optical network unit attempting to connect to the optical line termination receives the required information for establishing an optical communication link no matter to which frequency its transmitter/receiver is at present adjusted. After having received the broadcast information the optical network unit (ONU1,.., ONU7), adjusts its transmitter and/or receiver to a communication channel/communication wavelength that is indicated as being free and in return transmits its identification to the optical line termination which builds a list associating optical network units and the wavelength used for communication by the respective optical network units which is stored and transmitted in return in the next broadcast. In the context of the present invention power management schemes and calibration schemes are encompassed as well.