发明授权
- 专利标题: Method of flexible multiple broadcast service delivery over a WDM passive optical network based on RF Block-conversion of RF service bands within wavelength bands
- 专利标题(中): 基于波段内的RF服务频带的RF块转换的WDM无源光网络的灵活多广播服务传送方法
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申请号: US09916648申请日: 2001-07-30
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公开(公告)号: US07286761B2公开(公告)日: 2007-10-23
- 发明人: Martin Birk , Patrick P. Iannone , Kenneth C. Reichmann , Nicholas J. Frigo , Cedric F. Lam
- 申请人: Martin Birk , Patrick P. Iannone , Kenneth C. Reichmann , Nicholas J. Frigo , Cedric F. Lam
- 申请人地址: US NY New York
- 专利权人: AT&T Corp.
- 当前专利权人: AT&T Corp.
- 当前专利权人地址: US NY New York
- 主分类号: H04J14/00
- IPC分类号: H04J14/00
摘要:
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 bands, 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-up 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 disclosed.
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