Patent ID: 6915079
Filing Date: 2005-07-05
Classification: H04B,H04J

Abstract:
1. A passive optical network arrangement comprising: a head-end station; a plurality of subscriber stations; a passive optical network providing optical connectivity from each of said stations to each other station; wherein each of said plurality of subscriber stations is arranged to transmit on a common optical wavelength λ1 distinct from the wavelength λ2 on which said head-end station is arranged to transmit, and each of said plurality of subscriber stations is arranged to detect when another of said subscriber stations is transmitting on said common optical wavelength λ1 over said passive optical network, and in which the passive optical network comprises a passive optical coupler comprising a plurality of port pairs, each port pair comprising an input port and a corresponding output port; wherein each input port is coupled to all output ports other than its corresponding output port.