Optical transmission network
First Claim
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1. An optical transmission network comprising:
- a central office,a plurality of user stations, anda plurality of bidirectional optical transmission paths for connecting said central office with each of said user stations,said central office comprising;
a coherent light source for emitting coherent radiation to accommodate high-capacity, wide bandwidth data requirements,power dividing means for dividing said coherent radiation over said transmission paths for transmitting said coherent radiation from said central office to said user stations,modulating means associated with each of said transmission paths for modulating high-capacity, wide bandwidth information onto said coherent radiation transmitted from said central office to said user stations, anddetector means associated with each transmission path for detecting radiation transmitted from said user stations to said central office; and
each of said user stations comprising,a detector for detecting the information modulated onto said coherent, high-capacity, wide bandwidth radiation transmitted from said central office, anda light emitting diode for transmitting low-capacity, narrow bandwidth information-bearing radiation to said central office.
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Abstract
An optical communications network which connects a central office with a plurality of user stations is disclosed.
In the central office, the power from a single cw laser is divided over a plurality of single mode optical fibers to transmit information from the central office to the user stations. Each user station includes a directly modulated LED for transmitting information to the central office.
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Citations
12 Claims
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1. An optical transmission network comprising:
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a central office, a plurality of user stations, and a plurality of bidirectional optical transmission paths for connecting said central office with each of said user stations, said central office comprising; a coherent light source for emitting coherent radiation to accommodate high-capacity, wide bandwidth data requirements, power dividing means for dividing said coherent radiation over said transmission paths for transmitting said coherent radiation from said central office to said user stations, modulating means associated with each of said transmission paths for modulating high-capacity, wide bandwidth information onto said coherent radiation transmitted from said central office to said user stations, and detector means associated with each transmission path for detecting radiation transmitted from said user stations to said central office; and each of said user stations comprising, a detector for detecting the information modulated onto said coherent, high-capacity, wide bandwidth radiation transmitted from said central office, and a light emitting diode for transmitting low-capacity, narrow bandwidth information-bearing radiation to said central office. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An optical transmission network for providing communication between a central office and a plurality of user stations, said network comprising,
a source of coherent radiation, for transmitting high-capacity, wide bandwidth information-carrying radiation, located in said central office, bidirectional optical transmissions means including a plurality of single mode optical fibers for transmitting a portion of said coherent radiation to each of said user stations, and a light emitting diode located in each of said user stations for emitting low-capacity, narrow bandwidth information-bearing radiation to be transmitted by said bidirectional transmitting means to said central office.
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11. A transmission network interconnecting a communications center and a user station, the network comprising:
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a transmission path comprising single mode optical fibers linking the communications center and the user station, laser means, coupled to the communications center and said path, for transmitting coherent radiation to the user station, modulating means associated with said path for modulating high-capacity, wide bandwidth information onto said coherent radiation transmitted from said central office to said user station, detector means associated with said path at the communications center for detecting radiation transmitted from the user station to the communications center, detector means associated with said path at the user station for detecting radiation transmitted from the communications center to the user station, and light emitting diode means coupled to the user station and said path, for optically communicating low-capacity, narrow bandwidth information from the user station to the communications center over said path.
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12. A network interconnecting a communications center with a plurality of user stations, the network comprising:
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a plurality of bi-directional, single mode optical fiber paths interconnecting the communications center with each corresponding one of the user stations, the communications center further comprising; a continuous wave coherent light source for transmitting high-capacity, wide bandwidth coherent radiation, power dividing means for dividing said coherent radiation among said paths, and wave division multiplexing means for transmitting said coherent radiation from the communications center to each user station at a first preselected wavelength over the corresponding one of said paths, each user station further comprising; a light emitting diode for transmitting low-capacity, narrow bandwidth information, and wave division multiplexing means for transmitting said low-capacity, narrow bandwidth information to the communications center at a second preselected wavelength over the corresponding same one of said paths.
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Specification