Broadband information communications network system with coherent optical data transmission lines
First Claim
1. An apparatus for serving as a terminal station coupled with other terminal stations in an optical information communications system, said apparatus comprising:
- signal input means for receiving several kinds of optical information signals which are time-division multiplexed and optical frequency-division multiplexed when transmitted from certain ones of the terminal stations, and for disassembling the input signals into a number of electrical time-division multiplexed information signals;
signal exchange means connected to said signal input means, for exchanging selected signals which are selected from among the electrical signals in accordance with destinations of them, and for generating exchanged electrical time-division multiplexed information signals;
signal output means connected to said signal exchange means and external signal transmission lines, for optical frequency-division multiplexing the exchanged electrical time-division multiplexed information signals, and for sending out optical frequency-division and time-division multiplexed information signals onto corresponding ones of said external signal transmission lines; and
bypass means provided between said signal input means and said signal output means, for directly transferring the remaining ones of said electrical signals from said signal input means to said signal output means without passing through said signal exchange means.
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Abstract
A terminal-inside signal handing architecture is disclosed which is preferably applied to an extra-large capacity digital integrated network for optical broadband information communications among terminal stations via optical fiber link cables. A terminal station has a signal input section including optical demultiplexers and optoelectric converters, a signal output section connected with optical fiber cables and including electrooptical converters, and a data switching section provided between the signal input and output sections. The switching section has a main section connected to a sub-network system, demultiplexers provided at pre-stage of the main section, and multiplexers provided at the post-stage of the main section. The switching section disassembles and exchange only selected ones of the input information supplied to this station, the remaining ones of the input signals are directly transferred by direct connection lines between the input section and the output section at higher transmission rate without through the switching section in such a form as they are output by the signal input section.
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Citations
12 Claims
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1. An apparatus for serving as a terminal station coupled with other terminal stations in an optical information communications system, said apparatus comprising:
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signal input means for receiving several kinds of optical information signals which are time-division multiplexed and optical frequency-division multiplexed when transmitted from certain ones of the terminal stations, and for disassembling the input signals into a number of electrical time-division multiplexed information signals; signal exchange means connected to said signal input means, for exchanging selected signals which are selected from among the electrical signals in accordance with destinations of them, and for generating exchanged electrical time-division multiplexed information signals; signal output means connected to said signal exchange means and external signal transmission lines, for optical frequency-division multiplexing the exchanged electrical time-division multiplexed information signals, and for sending out optical frequency-division and time-division multiplexed information signals onto corresponding ones of said external signal transmission lines; and bypass means provided between said signal input means and said signal output means, for directly transferring the remaining ones of said electrical signals from said signal input means to said signal output means without passing through said signal exchange means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A signal processing method applied to an optical information communications system including a selected number of terminal stations which bidirectionally communicate with one another by optical data transmission lines, said method comprising the steps of:
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disassembling optical information signals, which are time-division multiplexed and optical frequency-division multiplexed when transmitted to a certain terminal station from certain ones of the other associating terminal stations, into a number of electrical time-division multiplexed information signals; selecting specific signals from among said electrical time-division multiplexed information signals in accordance with a predetermined algorithm; supplying said specific signals to a signal exchange section provided inside said certain terminal station, which executes a line exchanging operation for said specific signals thereby to generate exchanged electrical time-division multiplexed information signals; optical frequency-division mutiplexing the exchanged electrical time-division multiplexed information signals to produce optical frequency-division and time-division multiplexed information signals, which are then supplied to corresponding ones of external signal transmission lines provided for said certain terminal station; and directly sending outward from said certain terminal station the remaining ones of said electrical time-division multiplexed information signals to said signal output means without passing through said signal exchange section in said certain terminal station. - View Dependent Claims (8, 9, 10, 11)
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12. An optical information communication system including a plurality of terminal stations which bidirectionally communicate with one another by optical data transmission lines coupling said terminal stations, and which process several kinds of optical information signals that are time-division multiplexed and optical frequency-division multiplexed, each of said terminal stations comprising:
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signal input means for, when the information signals are supplied thereto from certain ones of said terminal stations, disassembling the input signal into a number of electrical time-division multiplexed information signals; signal exchange means connected to said signal input means, for exchanging selected signals which are selected from among the electrical signals in accordance with destinations of them, and for generating exchanged electrical time-division multiplexed information signals; signal output means connected to said signal exchange means and external signal transmission lines, for optical frequency-division multiplexing the exchanged electrical time-division multiplexed information signals, and for sending out optical frequency-division and time-division multiplexed information signals onto corresponding ones of said external signal transmission lines; bypass means provided between said signal input means and said signal output means, for directly transferring the remaining ones of said electrical signals from said signal input means to said signal output means without passing through said signal exchange means; and said signal exchange means including demultiplexer means for demultiplexing said electrical signals, digital switch means connected to said demultiplexer means, for executing a data exchange function, and multiplexer means connected to said digital switch means, for multiplexing output signals of said digital switch means.
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Specification