Optical communications – Multiplex – Broadcast and distribution system
Reexamination Certificate
2011-03-22
2011-03-22
Tran, Dzung D (Department: 2613)
Optical communications
Multiplex
Broadcast and distribution system
C398S066000, C398S079000
Reexamination Certificate
active
07912372
ABSTRACT:
The present invention relates to a passive optical network, which inexpensively improves the spectral efficiency of an access network and is capable of increasing the number of subscribers per channel by using WDM in combination with Time Division Multiplexing (TDM) or SubCarrier Multiple Access (SCMA) to expand a conventional WDM passive optical network. The passive optical network includes light providing means provided in a central office to provide broadband incoherent light; a multiplexer connected to the central office via an optical fiber to divide the light transmitted from the light providing means according to wavelengths and to multiplex upstream signals; a plurality of splitters to branch divided lights and to combine the upstream optical signals; and a plurality of subscribers connected to the splitters, the subscribers including wavelength-locked Fabry-Perot laser diodes capable of performing direct and analog modulation, and means for directly modulating lights of the Fabry-Perot laser diodes and transmitting modulated lights to the subscribers using time division multiplexing.
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Baik Jin Serk
Choi Ki Man
Jang Seung Hyun
Lee Chang Hee
Min Hyun Sik
Blakely Sokoloff Taylor & Zafman LLP.
Korea Advanced Institute of Science and Technology
Tran Dzung D
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