Patent ID: 8290370

Claim:
A central office used in a wavelength division multiplexing passive optical network, which provides a broadcasting service and a communication service simultaneously, the central office comprising: a plurality of downstream optical transmitters for outputting first optical signals for providing a plurality of subscribers with a data service; a plurality of upstream optical receivers for receiving optical signals of upstream data from the subscribers and converting the optical signals into electrical signals; a wavelength division multiplexer/demultiplexer for multiplexing/demultiplexing the optical signals; a broadband light source for broadcasting signals comprising mutually injected Fabry-Perot laser diodes which are coupled to the wavelength division multiplexer/demultiplexer to output optical signals for providing the subscribers with a broadcasting service; and a modulator coupled to the mutually injected Fabry-Perot laser diodes for modulating the optical signals of the mutually injected Fabry-Perot laser diodes into broadcasting signals.