Optical communications – Multiplex – Broadcast and distribution system
Reexamination Certificate
2008-11-24
2010-12-28
Phan, Hanh (Department: 2613)
Optical communications
Multiplex
Broadcast and distribution system
C398S066000, C398S067000, C398S068000, C398S070000, C725S105000, C725S127000, C725S129000
Reexamination Certificate
active
07860393
ABSTRACT:
A system and method for simultaneous delivery of a plurality of independent blocks of 500 MHz digital broadcast television services, stacking a plurality of RF blocks on a plurality of spectrally sliced WDM optical bands. The method for delivering a plurality of video blocks to a user terminal serviced by a remote node comprises the steps of receiving, by a first WDM, a broadband signal from a broadband signal source, separating, by the first WDM, the broadband signal into a plurality of optical hands, modulating each of the plurality of optical bands with a composite signal representing data in a plurality of independent RF blocks to form a plurality of modulated signals, forwarding the plurality of modulated signals to a second WDM to form a combined broadcast signal, transmitting the combined broadcast signal over feeder fiber to a remote node, selecting a RF block for distribution over a distribution fiber to a conventional satellite set-top box at a user's site and forwarding the selected RF block to the user's site. A novel method and system for reducing spontaneous beat noise is also described.
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Birk Martin
Frigo Nicholas J.
Iannone Patrick P.
Lam Cedric F.
Reichmann Kenneth C.
AT&T Intellectual Property I, LP
Larson Newman & Abel LLP
Phan Hanh
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