Optical communications – Multiplex – Broadcast and distribution system
Reexamination Certificate
2007-07-16
2010-06-08
Singh, Dalzid (Department: 2613)
Optical communications
Multiplex
Broadcast and distribution system
C398S069000, C398S070000, C398S071000, C398S072000
Reexamination Certificate
active
07734178
ABSTRACT:
In a PON system by WDM, IP broadcast can be received without oppressing a band used by a user for Internet communication. An OLT provides a first wavelength received in common by respective ONUs and plural second wavelengths by which the OLT and the respective ONUs perform communication individually. With respect to signals in the downstream direction, each of the OLTs includes a transmitter to transmit the first wavelength and plural transmitters to transmit the second wavelengths used for the individual communication with the respective ONUs. Each of the ONUs includes a receiver to receive the first wavelength and a receiver to receive the second wavelength used in the ONU itself. The OLT transmits data of the IP broadcast by the first wavelength and transmits individual data of each of the ONUs by the second wavelength corresponding to the ONU.
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International Telecommunication Union, ITU-T, G.984.3, Feb. 2004., Series G: Transmission Systems and Media, Digital Systems and Networks.
Kazawa Tohru
Sakamoto Ken'ichi
Hitachi , Ltd.
Mattingly & Malur, P.C.
Singh Dalzid
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