Optical communications – Multiplex – Broadcast and distribution system
Reexamination Certificate
2005-11-22
2008-12-30
Sedighian, M. R. (Department: 2613)
Optical communications
Multiplex
Broadcast and distribution system
C398S071000, C398S092000, C398S157000, C359S341300
Reexamination Certificate
active
07471900
ABSTRACT:
Provided are a passive optical network system and a method of transmitting a broadcasting signal in the same system. A central office (CO) generates a broadcasting signal and a downstream optical data signal using a coding method guaranteeing a run-length, multiplexes the downstream optical data signal and the broadcasting signal, and transmits the multiplexed downstream optical data signal and broadcasting signal. A remote node (RN) transmits the multiplexed downstream optical data signal and broadcasting signal received from the CO to one or more optical network units (ONUs). A gain medium, which is located on a transmission line between the CO and the RN, amplifies the broadcasting signal using the downstream optical data signal as a pump light source. Accordingly, a high gain can be obtained by amplifying the broadcasting signal using the gain medium located on the transmission line without a separate pump light source.
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Kang Hyun Seo
Koh Jai Sang
Lee Byung Tak
Lee Moon Seop
Blakely , Sokoloff, Taylor & Zafman LLP
Electronics and Telecommunications Research Institute
Sedighian M. R.
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