Patent ID: 7418204

Claim:
A passive optical network system comprising a central office, a local office, and a plurality of subscriber terminals, the local office and the central office being connected to each other through an optical fiber, the subscriber terminals being connected to the local office, the central office providing optical communication service to the subscriber terminals through the local office, the local office comprising: a first wavelength division multiplexer for: receiving multiplexed signals from the central office, and demultiplexing the received multiplex signals into respective downstream optical signals for downstream data service, broadcasting optical signals for broadcasting service and pumping optical signals, and multiplexing upstream data service signals transmitted from the subscriber terminals; an optical amplifier media that receives the broadcasting optical signals and the pumping optical signals from the first wavelength division multiplexer, such the broadcasting optical signals are amplified by the pumping optical signals; a second wavelength division multiplexer that multiplexes the broadcasting optical signals amplified by the optical amplifier media and the downstream optical signals, the second wavelength division multiplexer demultiplexing the upstream data service signals transmitted from the subscriber terminals; and an optical divider coupler that divides the multiplexed optical signals transmitted from the second wavelength division multiplexer, so as to distribute the divided signals to the subscriber terminals, the optical divider coupler further coupling the upstream data service signals transmitted from the subscriber terminals.