Patent ID: 7366415
Filing Date: 2008-04-29
Classification: H04H,H04J

Abstract:
1. A Wavelength division multiplexing-passive optical network that enables an integration of broadcast and communication data, the network comprising: an optical line terminal to (1) receive a digital broadcast signal from a broadcasting network and a first communication signal from an internet protocol network, and (2) transmit the digital broadcast signal and the first communication signal as a single integrated optical signal; an optical network terminal/optical network unit at a user-side device for transferring (1) the single integrated optical signal, from the optical line terminal, to a service user, end (2) user data from the service user to the optical line terminal; a first WDM demultiplexer for WDM-demultiplexing the single integrated optical signal from the optical line terminal, and transferring it to the optical network terminal/optical network unit; and a first WDM multiplexer for WDM-multiplexing the user data from the optical network terminal/optical network unit and transferring it to the optical line terminal, wherein the optical line terminal is further enabled to transfer a second communication signal, received from the service user, to the Internet protocol network; wherein the user data includes channel-information data of a digital broadcast desired by the service user and the second communication signal; and wherein the optical line terminal further includes: a broadcast switch for switching digital broadcast data from the broadcasting network; a broadcast channel controller for selecting the digital broadcast signal desired by the service user by controlling the broadcast switch according to the channel-information data included in the user data; a first Ethernet switch for switching each of the first and second communication signal so as to transmit the second communication signal included in the user data to the Internet protocol network, or to transmit the first communication signal to the optical network terminal/optical network unit; a communication/broadcast multiplexer for multiplexing the first communication signal and the digital broadcast signal; a second Ethernet switch for separating the user data received from the service user into the channel-information data and the second communication signal from the service user; a first optical transmitter for optically modulating the first communication signal and the digital broadcast signal, multiplexed through the communication/broadcast multiplexer, into the single integrated optical signal by its electro-optical conversion; a second WDM multiplexer for multiplexing wavelength-by-wavelength signals, optically modulated through the first optical transmitter, and transferring them to the optical network terminal/optical network unit; a second WDM demultiplexer for separating optical signals, transmitted from the optical network terminal/optical network unit, according to their wavelength; and a first optical receiver for photoelectrically converting the optical signals separated according to their wavelength through the second WDM demultiplexer.