Optical communications – Multiplex – Broadcast and distribution system
Reexamination Certificate
2006-12-26
2006-12-26
Phan, Hanh (Department: 2613)
Optical communications
Multiplex
Broadcast and distribution system
C398S067000, C398S068000, C398S071000, C398S070000, C398S079000, C398S091000, C398S092000, C398S135000, C398S139000, C398S141000, C398S158000, C398S159000, C398S153000, C398S154000, C398S202000, C398S208000, C398S214000, C398S182000, C398S183000, C398S184000, C398S192000, C398S193000, C398S194000, C385S024000, C385S037000
Reexamination Certificate
active
07155127
ABSTRACT:
Cost-reduction in an optical communication unit is achieved by using spectrum-sliced modulated broadband light for transmitting upstream signals, instead of using laser light. An optical communication system includes at least one pair of optical communication units that each has a bi-directional network interface in which physical bit rates of transmission signals and reception signals are identical, an optical transmitter, and an optical receiver, and that performs bi-directional transmissions via at least one optical fiber. One optical communication unit includes a physical bit rate down-converter that lowers the physical bit rate of transmission signals from the bi-directional network interface and outputs to the optical transmitter, and the other optical communication unit includes a physical bit rate up-converter that raises the physical bit rate of signals received by the optical receiver and outputs to the bi-directional network interface. These optical communication units are also applicable to wavelength-division multiplexing systems.
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Akimoto Koji
Fukui Masaki
Iwatsuki Katsumi
Kani Jun-ichi
Teshima Mitsuhiro
Darby & Darby
Nippon Telegraph and Telephone Corporation
Phan Hanh
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