CA2108305C - Optical concentrator and optical communication network using the same - Google Patents
Optical concentrator and optical communication network using the sameInfo
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- CA2108305C CA2108305C CA 2108305 CA2108305A CA2108305C CA 2108305 C CA2108305 C CA 2108305C CA 2108305 CA2108305 CA 2108305 CA 2108305 A CA2108305 A CA 2108305A CA 2108305 C CA2108305 C CA 2108305C
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Abstract
In an optical concentrator, a plurality of ports are provided for inputting and outputting first and second optical signals having different wavelength regions. An optical coupler is connected to each of the plurality of ports without being through remaining ones of the plurality of ports. The optical coupler transmits the second optical signal input from one of the plurality of ports to at least one of the remaining ports. A transmitter is provided to connect the plurality of ports in a loop form. The first optical signal input from each port is transmitted from the transmitter. Demultiplexers are arranged at each port for demultiplexing the first and second optical signals input from each port so as to guide the first optical signal to the transmitter and the second optical signal to the optical coupler.
Claims (83)
1. An optical concentrator which is utilized in an optical communication network comprising an optical concentrator and a plurality of nodes respectively connected to said optical concentrator comprising:
N (where N is an integer of not less than two) ports for inputting and outputting first and second optical signals having different wavelength regions, said N ports including a plurality of ports each of which is connected to a node;
an optical coupler connected to each of said N
ports, said optical coupler transmitting the second optical signal input from one of said N ports to at least one of the remaining ports;
transmitting means for connecting said N ports in a loop form and transmitting the first optical signal input from each of said N ports; and demultiplexing means, arranged at each of said N
ports, for demultiplexing the first and second optical signals input from each of said N ports, and guiding the first optical signal to said transmitting means and the second optical signal to said optical coupler.
N (where N is an integer of not less than two) ports for inputting and outputting first and second optical signals having different wavelength regions, said N ports including a plurality of ports each of which is connected to a node;
an optical coupler connected to each of said N
ports, said optical coupler transmitting the second optical signal input from one of said N ports to at least one of the remaining ports;
transmitting means for connecting said N ports in a loop form and transmitting the first optical signal input from each of said N ports; and demultiplexing means, arranged at each of said N
ports, for demultiplexing the first and second optical signals input from each of said N ports, and guiding the first optical signal to said transmitting means and the second optical signal to said optical coupler.
2. A concentrator according to claim 1, wherein each of said N ports comprises an input terminal and an output terminal, and said demultiplexing means comprises N wavelength division demultiplexers each of which is connected to said input terminal of each of said N ports.
3. A concentrator according to claim 2, further comprising multiplexing means, arranged at each of said N
ports, for multiplexing the first optical signal transmitted by said transmitting means and the second optical signal output from said optical coupler and outputting the multiplexed signal to each of said N ports.
ports, for multiplexing the first optical signal transmitted by said transmitting means and the second optical signal output from said optical coupler and outputting the multiplexed signal to each of said N ports.
4. A concentrator according to claim 3, wherein said multiplexing means comprises N wavelength division multiplexers each of which is connected to said output terminal of each of said N ports.
5. A concentrator according to claim 4, wherein said transmitting means connects one of said N wavelength division demultiplexers and one of said N wavelength division multiplexers which are connected to different ports.
6. A concentrator according to claim 1, wherein said optical coupler comprises a star coupler for dividing the second optical signal input from one of said N ports to all ports.
7. A concentrator according to claim 1, wherein said optical coupler comprises an optical exchanger for selectively transmitting the second optical signal input from one of said N ports to at least one of the remaining ports.
8. A concentrator according to claim 1, wherein said N ports input and output third and fourth optical signals having wavelength regions different from those of the first and second optical signals, said optical concentrator further comprises another optical coupler connected to said each of said N ports, said another optical coupler transmitting the fourth optical signal input from one of said N ports to at least one of the remaining ports, and another transmitting means for connecting said N ports in a loop form and transmitting the third optical signal input from each of said N ports, and said demultiplexing means demultiplexes the third and fourth optical signals input from each of said N ports, and guides the third optical signal to said another transmitting means and the fourth optical signal to said another optical coupler.
9. A concentrator according to claim 1, wherein one of said N ports comprises a repeating port, and said optical coupler comprises a first tree coupler for dividing the second optical signal input from said repeating port to all ports except for said repeating port, and a second tree coupler for transmitting the second optical signal input from all the ports except for said repeating port to said repeating port.
10. A concentrator according to claim 9, wherein said repeating port comprises an input unit and an output unit, and said optical concentrator further comprises switch means for directly and selectively inputting the first and second optical signals output from said output unit of said repeating port to said input unit of said repeating port.
11. A concentrator according to claim 1, further comprising a repeater, arranged in said transmitting means for connecting each of said N ports, for amplifying the first optical signal transmitted through said transmitting means.
12. A concentrator according to claim 1, further comprising a repeater, arranged between each of said N
ports and said optical coupler, for amplifying the second optical signals input to and output from each of said N
ports.
ports and said optical coupler, for amplifying the second optical signals input to and output from each of said N
ports.
13. A concentrator according to claim 1, further comprising switch means for coupling said transmitting means without being through a failed port when a failure has occurred in any one of said N ports.
14. A concentrator according to claim 13, wherein each of said N ports comprises an input terminal and an output terminal, and said switch means comprises first and second optical switches arranged on said transmitting means, said first and second optical switches corresponding to each of said output and input terminals, and a transmission channel for directly connecting said first and second optical switches corresponding to each of said output and input terminals of each of said N
ports.
ports.
15. A concentrator according to claim 1, further comprising wavelength converting means, connected to each of said N ports, for converting a wavelength of the second optical signal input from each of said N ports to said optical coupler.
16. A concentrator according to claim 15, further comprising wavelength control means, connected to said transmitting means, for controlling said wavelength converting means in accordance with the first optical signal transmitted by said transmitting means.
17. A concentrator according to claim 1, wherein the first optical signal comprises a plurality of optical signals having different wavelengths in a predetermined wavelength region, said transmitting means comprises a plurality of transmission channels, and said demultiplexing means further demultiplexes the plurality of optical signals and guides the optical signals to different ones of said plurality of transmission channels.
18. An optical communication network comprising:
an optical concentrator having N (where N is an integer of not less than two) ports for inputting and outputting first and second optical signals having different wavelength regions; and a plurality of nodes each of which is connected to any one of said N ports of said optical concentrator;
said optical concentrator comprising:
an optical coupler connected to each of said N
ports, said optical coupler transmitting the second optical signal input from one of said N ports to at least one of the remaining ports, transmitting means for connecting said N ports in a loop form and transmitting the first optical signal input from each of said N ports; and demultiplexing means, arranged at each of said N
ports, for demultiplexing the first and second optical signals input from each of said N ports, and guiding the first optical signal to said transmitting means and the second optical signal to said optical coupler.
an optical concentrator having N (where N is an integer of not less than two) ports for inputting and outputting first and second optical signals having different wavelength regions; and a plurality of nodes each of which is connected to any one of said N ports of said optical concentrator;
said optical concentrator comprising:
an optical coupler connected to each of said N
ports, said optical coupler transmitting the second optical signal input from one of said N ports to at least one of the remaining ports, transmitting means for connecting said N ports in a loop form and transmitting the first optical signal input from each of said N ports; and demultiplexing means, arranged at each of said N
ports, for demultiplexing the first and second optical signals input from each of said N ports, and guiding the first optical signal to said transmitting means and the second optical signal to said optical coupler.
19. A network according to claim 18, wherein each of said N ports of said optical concentrator comprises an input terminal and an output terminal, and said demultiplexing means comprises N wavelength division demultiplexers, each of which is connected to said input terminal of each of said N ports.
20. A network according to claim 19, wherein said optical concentrator further comprises multiplexing means, arranged at each of said N ports, for multiplexing the first optical signal transmitted by said transmitting means and the second optical signal output from said optical coupler, and outputting the multiplexed signal to each of said N ports.
21. A network according to claim 20, wherein said multiplexing means comprises N wavelength division multiplexers each of which is connected to said output terminal of each of said N ports.
22. A network according to claim 21, wherein said transmitting means connects one of said N wavelength division demultiplexers and one of said N wavelength division multiplexers which are connected to different ports.
23. A network according to claim 18, wherein each of said plurality of nodes comprises a first optical transmitter for generating the first optical signal, a second optical transmitter for generating the second optical signal, a wavelength division multiplexer for multiplexing the first and second optical signals and outputting the multiplexed signal to a port of said optical concentrator, a wavelength division demultiplexer for demultiplexing the first and second optical signals input from a port of said optical concentrator, a first optical receiver for receiving the first optical signal demultiplexed by said wavelength division demultiplexer, and a second optical receiver for receiving the second optical signal demultiplexed by said wavelength division demultiplexer.
24. A network according to claim 23, wherein said second optical transmitter comprises a variable wavelength semiconductor laser, and each node further comprises a variable wavelength filter arranged between said wavelength division demultiplexer and said second optical receiver.
25. A network according to claim 18, further comprising another optical concentrator connected to one of said N ports of said optical concentrator.
26. A network according to claim 18, wherein said optical coupler comprises a star coupler for dividing the second optical signal input from one of said N ports to all ports.
27. A network according to claim 18, wherein said optical coupler comprises an optical exchanger for selectively transmitting the second optical signal input from one of said N ports to at least one of the remaining ports.
28. A network according to claim 18, further comprising a repeater, arranged in said transmitting means for connecting each of said N ports, for amplifying the first optical signal transmitted through said transmitting means.
29. A network according to claim 18, further comprising a repeater, arranged between each of said N
ports and said optical coupler, for amplifying the second optical signal input to and output from each of said N
ports.
ports and said optical coupler, for amplifying the second optical signal input to and output from each of said N
ports.
30. A network according to claim 18, further comprising switch means for coupling said transmitting means without being through a failed port when a failure has occurred in any one of said N ports.
31. A network according to claim 30, wherein each of said N ports comprises an input terminal and an output terminal and said switch means comprises first and second optical switches arranged on said transmitting means, said first and second optical switches corresponding to each of said output and input terminals, and a transmission channel for directly connecting said first and second optical switches corresponding to each of said output and input terminals of each of said N ports.
32. A network according to claim 18, wherein said optical concentrator further comprises wavelength converting means, connected to each of said N ports, for converting a wavelength of the second optical signal input from each of said N ports to said optical coupler.
33. A network according to claim 32, wherein said optical concentrator further comprises wavelength control means, connected to said transmitting means, for controlling said wavelength converting means in accordance with the first optical signal transmitted by said transmitting means.
34. A network according to claim 18, wherein the first optical signal comprises a plurality of optical signals having different wavelengths in a predetermined wavelength region, said transmitting means comprises a plurality of transmission channels, and said demultiplexing means further demultiplexes the plurality of optical signals and guides the optical signals to different ones of said plurality of transmission channels.
35. A method of transmitting optical signals using an optical concentrator which is utilized in an optical communication network comprising an optical concentrator and a plurality of nodes respectively connected to said optical concentrator, comprising N (where N is an integer of not less than two) ports, said N ports including a plurality of ports, each of which is connected to a node, an optical coupler having N ports each of which is connected to one of said N ports, and transmitting means for connecting said N ports in a loop form, comprising the steps of:
inputting first and second optical signals having different wavelength regions from one of said N
ports;
demultiplexing the first and second optical signals input from said one port;
transmitting the demultiplexed first optical signal through said transmitting means; and transmitting the demultiplexed second optical signal to at least one of the remaining ports by said optical coupler.
inputting first and second optical signals having different wavelength regions from one of said N
ports;
demultiplexing the first and second optical signals input from said one port;
transmitting the demultiplexed first optical signal through said transmitting means; and transmitting the demultiplexed second optical signal to at least one of the remaining ports by said optical coupler.
36. A method according to claim 35, further comprising the steps of: multiplexing the first optical signal transmitted through said transmitting means and the second optical signal transmitted by said optical coupler; and outputting a multiplexed signal to at least one of the remaining ports.
37. A method according to claim 35, further comprising the step of coupling said transmitting means without being through a failed port when a failure has occurred in any one of said N ports.
38. A method according to claim 35, further comprising the step of converting a wavelength of the second optical signal input from each of said N ports to said optical coupler.
39. A method according to claim 38, further comprising the step of controlling wavelength conversion of the second optical signal in accordance with the first optical signal transmitted through said transmitting means.
40. An optical concentrator which is utilized in an optical communication network comprising an optical concentrator and a plurality of nodes respectively connected to said optical concentrator comprising:
N (where N is an integer of not less than two) ports for inputting and outputting optical signals, said N ports including a plurality of ports each of which is connected to a node;
N wavelength division demultiplexers, respectively, connected to said N ports, for demultiplexing the optical signals input from said N
ports into first and second portions;
an optical coupler, connected to said N
wavelength division demultiplexers, for outputting the second portion of the optical signal input from one of said N ports to at least one of remaining ports; and N wavelength division multiplexers, respectively connected to said N ports and arranged such that a first wavelength division multiplexer of said N wavelength division multiplexers multiplexes the first portion of the optical signal demultiplexed by an N-th wavelength division demultiplexer and the second portion of the optical signal output from said optical coupler, and a k-th (where k = 2, ..., N) wavelength division multiplexer multiplexes the first portion of the optical signal demultiplexed by a (k-1)-th wavelength division demultiplexer and the second portion of the optical signal output from said optical coupler.
N (where N is an integer of not less than two) ports for inputting and outputting optical signals, said N ports including a plurality of ports each of which is connected to a node;
N wavelength division demultiplexers, respectively, connected to said N ports, for demultiplexing the optical signals input from said N
ports into first and second portions;
an optical coupler, connected to said N
wavelength division demultiplexers, for outputting the second portion of the optical signal input from one of said N ports to at least one of remaining ports; and N wavelength division multiplexers, respectively connected to said N ports and arranged such that a first wavelength division multiplexer of said N wavelength division multiplexers multiplexes the first portion of the optical signal demultiplexed by an N-th wavelength division demultiplexer and the second portion of the optical signal output from said optical coupler, and a k-th (where k = 2, ..., N) wavelength division multiplexer multiplexes the first portion of the optical signal demultiplexed by a (k-1)-th wavelength division demultiplexer and the second portion of the optical signal output from said optical coupler.
41. A concentrator according to claim 40, wherein said optical coupler comprises a star coupler for transmitting the second portion of the optical signal input from one of said N ports to all ports.
42. A concentrator according to claim 40, wherein said optical coupler comprises an optical exchanger for selectively transmitting the second portion of the optical signal input from one of said N ports to at least one of the remaining ports.
43. A concentrator according to claim 40, wherein one of said N ports comprises a repeating port, and said optical coupler comprises a first tree coupler for dividing the second portion of the optical signal input from said repeating port to all ports except for said repeating port and a second tree coupler for transmitting the second portion of the optical signal input from all the ports except for said repeating port to said repeating port.
44. A concentrator according to claim 43, wherein said repeating port comprises an input unit and an output unit, and said optical concentrator further comprises switch means for directly and selectively inputting the first portion of the optical signal and the second portion of the optical signal which are output from said output unit of said repeating port to said input unit of said repeating port.
45. A concentrator according to claim 40, further comprising transmitting means for connecting said wavelength division demultiplexers and said wavelength division multiplexers and a repeater for amplifying the first portion of the optical signal transmitted through said transmitting means.
46. A concentrator according to claim 40, further comprising repeaters, arranged between each of said N
wavelength division demultiplexers and said optical coupler and between each of said wavelength division multiplexers and said optical coupler, for inputting and outputting the second portion of the optical signal to all the ports.
wavelength division demultiplexers and said optical coupler and between each of said wavelength division multiplexers and said optical coupler, for inputting and outputting the second portion of the optical signal to all the ports.
47. A concentrator according to claim 40, further comprising switch means for coupling said transmitting means without being through a failed port when a failure has occurred in any one of said N ports.
48. A concentrator according to claim 47, wherein each of said N ports comprises an input terminal and an output terminal, and said switch means comprises first and second optical switches arranged on said transmitting means, said first and second optical switches corresponding to each of said output and input terminals, and a transmission channel for directly connecting said first and second optical switches corresponding to each of said output and input terminals of each of said N
ports.
ports.
49. A concentrator according to claim 40, further comprising wavelength converting means, connected to each of said N wavelength division demultiplexers, for converting a wavelength of the second portion of the optical signal input from each of said N wavelength division demultiplexers to said optical coupler.
50. A concentrator according to claim 49, further comprising transmitting means for connecting each of said N wavelength division demultiplexers and each of said N
wavelength division multiplexers and wavelength control means for controlling said wavelength converting means in accordance with the first portion of the optical signal transmitted by said transmitting means.
wavelength division multiplexers and wavelength control means for controlling said wavelength converting means in accordance with the first portion of the optical signal transmitted by said transmitting means.
51. A concentrator according to claim 40, further comprising a plurality of transmission channels for connecting said wavelength division demultiplexers and said wavelength division multiplexers, the first portion of the optical signal comprises a plurality of optical signals having different wavelengths in a predetermined wavelength region, and said each wavelength division demultiplexer further demultiplexes the plurality of signals and guides the signals to different ones of said transmission channels.
52. An optical communication network comprising:
an optical concentrator having N (where N is an integer of not less than two) ports for inputting and outputting optical signals; and a plurality of nodes each of which is connected to any one of said N ports of said optical concentrator;
said optical concentrator comprising:
N wavelength division demultiplexers, respectively, connected to said N ports, for demultiplexing the optical signals input from said N
ports into first and second portions, an optical coupler, connected to said N
wavelength division demultiplexers, for outputting the second portion of the optical signal input from one of said N ports to at least one of remaining ports, and N wavelength division multiplexers, respectively connected to said N ports and arranged such that a first wavelength division multiplexer of said N wavelength division multiplexers multiplexes the first portion of the optical signal demultiplexed by an N-th wavelength division demultiplexer and the second portion of the optical signal output from said optical coupler, and a k-th (where k = 2, ..., N) wavelength division multiplexer multiplexes the first portion of the optical signal demultiplexed by a (k-1)-th wavelength division demultiplexer and the second portion of the optical signal output from said optical coupler.
an optical concentrator having N (where N is an integer of not less than two) ports for inputting and outputting optical signals; and a plurality of nodes each of which is connected to any one of said N ports of said optical concentrator;
said optical concentrator comprising:
N wavelength division demultiplexers, respectively, connected to said N ports, for demultiplexing the optical signals input from said N
ports into first and second portions, an optical coupler, connected to said N
wavelength division demultiplexers, for outputting the second portion of the optical signal input from one of said N ports to at least one of remaining ports, and N wavelength division multiplexers, respectively connected to said N ports and arranged such that a first wavelength division multiplexer of said N wavelength division multiplexers multiplexes the first portion of the optical signal demultiplexed by an N-th wavelength division demultiplexer and the second portion of the optical signal output from said optical coupler, and a k-th (where k = 2, ..., N) wavelength division multiplexer multiplexes the first portion of the optical signal demultiplexed by a (k-1)-th wavelength division demultiplexer and the second portion of the optical signal output from said optical coupler.
53. A network according to claim 52, wherein each of said plurality of nodes comprises a first optical transmitter for generating the first portion of the optical signal, a second optical transmitter for generating the second portion of the optical signal, a wavelength division multiplexer for multiplexing the first portion of the optical signal and second portion of the optical signal and outputting the multiplexed signal to a port of said optical concentrator, a wavelength division demultiplexer for demultiplexing the first portion of the optical signal and second portion of the optical signal input from a port of said optical concentrator, a first optical receiver for receiving the first portion of the optical signal demultiplexed by said wavelength division demultiplexer, and a second optical receiver for receiving the second portion of the optical signal demultiplexed by said wavelength division demultiplexer.
54. A network according to claim 53, wherein said second optical transmitter comprises a variable wavelength semiconductor laser, and each node further comprises a variable wavelength filter arranged between said wavelength division demultiplexer and said second optical receiver.
55. A network according to claim 52, further comprising another optical concentrator connected to one of said N ports of said optical concentrator.
56. A network according to claim 52, wherein said optical coupler comprises a star coupler for dividing the second portion of the optical signal input from one of said N ports to all ports.
57. A network according to claim 52, wherein said optical coupler comprises an optical exchanger for selectively transmitting the second portion of the optical signal input from one of said N ports to at least one of the remaining ports.
58. A network according to claim 52, wherein one of said N ports comprises a repeating port, and said optical coupler comprises a first tree coupler for dividing the second portion of the optical signal input from said repeating port to all ports except for said repeating port and a second tree coupler for transmitting the second portion of the optical signal input from all the ports except for said repeating port to said repeating port.
59. A network according to claim 58, wherein said repeating port comprises an input unit and an output unit, and said optical concentrator further comprises switch means for directly and selectively inputting the first portion of the optical signal and the second portion of the optical signal which are output from said output unit of said repeating port to said input unit of said repeating port.
60. A network according to claim 52, wherein said optical concentrator further comprises transmitting means for connecting said wavelength division demultiplexers and said wavelength division multiplexers and a repeater for amplifying the first portion of the optical signal transmitted through said transmitting means.
61. A network according to claim 52, wherein said optical concentrator further comprises repeaters, arranged between each of said wavelength division demultiplexers and said optical coupler and between each of said wavelength division multiplexers and said optical coupler, for inputting and outputting the second portion of the optical signal to all the ports.
62. A network according to claim 52, wherein said optical concentrator further comprises switch means for coupling said transmitting means without being through a failed port when a failure has occurred in any one of said N ports.
63. A network according to claim 62, wherein each of said N ports comprises an input terminal and an output terminal, and said switch means comprises first and second optical switches arranged on said transmitting means, said first and second optical switches corresponding to each of said output and input terminals, and a transmission channel for directly connecting said first and second optical switches corresponding to each of said output and input terminals of each of said N
ports.
ports.
64. A network according to claim 52, wherein said optical concentrator further comprises wavelength converting means, connected to each of said N wavelength division demultiplexers, for converting the wavelength of the second portion of the optical signal input from each of said N wavelength division demultiplexers to said optical coupler.
65. A network according to claim 64, wherein said optical concentrator further comprises transmitting means for connecting each of said N wavelength division demultiplexers and each of said N wavelength division multiplexers and wavelength control means for controlling said wavelength converting means in accordance with the first portion of the optical signal transmitted by said transmitting means.
66. A network according to claim 52, wherein said optical concentrator further comprises a plurality of transmission channels for connecting said wavelength division demultiplexers and said wavelength division multiplexers, the first portion of the optical signal comprises a plurality of optical signals having different wavelengths in a predetermined wavelength region, and each of said N wavelength division demultiplexers further demultiplexes the plurality of signals and guides the signals to different ones of said transmission channels.
67. An optical concentrator which is utilized in an optical communication network comprising an optical concentrator and a plurality of nodes respectively connected to said optical concentrator comprising:
N (where N is an integer of not less than two) ports for inputting and outputting first and second optical signals, each of said N ports having a first input terminal for inputting the first optical signal, a second input terminal for inputting the second optical signal, a first output terminal for outputting the first optical signal, and a second output terminal for outputting the second optical signal, said N ports including a plurality of ports each of which is connected to a node;
an optical coupler, connected to said second input and output terminals of said N ports, for outputting the second optical signal input from said second input terminal of one of said N ports to said second output terminal of at least one of remaining ports; and transmitting means for connecting said N ports in a loop form, said transmitting means connecting said first input terminal of a first port to said first output terminal of an N-th port and said first input terminal of a k-th (where k = 2, ..., N) port to said first output terminal of a (k-1)-th port.
N (where N is an integer of not less than two) ports for inputting and outputting first and second optical signals, each of said N ports having a first input terminal for inputting the first optical signal, a second input terminal for inputting the second optical signal, a first output terminal for outputting the first optical signal, and a second output terminal for outputting the second optical signal, said N ports including a plurality of ports each of which is connected to a node;
an optical coupler, connected to said second input and output terminals of said N ports, for outputting the second optical signal input from said second input terminal of one of said N ports to said second output terminal of at least one of remaining ports; and transmitting means for connecting said N ports in a loop form, said transmitting means connecting said first input terminal of a first port to said first output terminal of an N-th port and said first input terminal of a k-th (where k = 2, ..., N) port to said first output terminal of a (k-1)-th port.
68. A concentrator according to claim 67, wherein said optical coupler comprises an optical exchanger for selectively transmitting the second optical signal input from said second input terminal of one of said N ports to said output terminal of at least one of the remaining ports.
69. A concentrator according to claim 67, further comprising a repeater, arranged in said transmitting means, for amplifying and repeating the first optical signal transmitted through said transmitting means.
70. A concentrator according to claim 67, further comprising repeaters, arranged between said second input terminal of each of said N ports and said optical coupler and between said second output terminal of each of said N
ports and said optical coupler, for amplifying the second optical signal.
ports and said optical coupler, for amplifying the second optical signal.
71. A concentrator according to claim 67, further comprising switch means for coupling said transmitting means without being through a failed port when a failure has occurred in any one of said N ports.
72. A concentrator according to claim 71, wherein each of said N ports comprises an input terminal and an output terminal, and said switch means comprises first and second optical switches arranged on said transmitting means, said first and second optical switches corresponding to each of said output and input terminals, and a transmission channel for directly connecting said first and second optical switches corresponding to each of said output and input terminals of each of said N
ports.
ports.
73. An optical communication network comprising:
an optical concentrator having N (where N is an integer of not less than two) ports for inputting and outputting first and second optical signals; and a plurality of nodes each of which is connected to any one of said N ports of said optical concentrator;
each of said N ports of said optical concentrator having a first input terminal for inputting the first optical signal, a second input terminal for inputting the second optical signal, a first output terminal for outputting the first optical signal, and a second output terminal for outputting the second optical signal, and said optical concentrator further comprising:
an optical coupler, connected to said second input and output terminals of said N ports, for outputting the second optical signal input from said second input terminal of one of said N ports to said second output terminal of at least one of remaining ports; and transmitting means for connecting said N ports in a loop form, said transmitting means connecting said first input terminal of a first port to said first output terminal of an N-th port and said first input terminal of a k-th (where k = 2, ..., N) port to said first output terminal of a (k-1)-th port.
an optical concentrator having N (where N is an integer of not less than two) ports for inputting and outputting first and second optical signals; and a plurality of nodes each of which is connected to any one of said N ports of said optical concentrator;
each of said N ports of said optical concentrator having a first input terminal for inputting the first optical signal, a second input terminal for inputting the second optical signal, a first output terminal for outputting the first optical signal, and a second output terminal for outputting the second optical signal, and said optical concentrator further comprising:
an optical coupler, connected to said second input and output terminals of said N ports, for outputting the second optical signal input from said second input terminal of one of said N ports to said second output terminal of at least one of remaining ports; and transmitting means for connecting said N ports in a loop form, said transmitting means connecting said first input terminal of a first port to said first output terminal of an N-th port and said first input terminal of a k-th (where k = 2, ..., N) port to said first output terminal of a (k-1)-th port.
74. A network according to claim 73, wherein said each node comprises a parallel transmission control unit and a serial transmission control unit.
75. A network according to claim 73, wherein said optical coupler comprises an optical exchanger for selectively transmitting the second optical signal input from said second input terminal of one of said N ports to at least one output terminal of the remaining ports.
76. A network according to claim 73, wherein said optical concentrator further comprises a repeater, arranged in said transmitting means, for amplifying the first optical signal transmitted through said transmitting means.
77. A network according to claim 73, wherein said optical concentrator further comprises repeaters, arranged between said second input terminal of each of said N ports and said optical coupler and between said second output terminal of each of said N ports and said optical coupler, for amplifying the second optical signals.
78. A network according to claim 73, wherein said optical concentrator further comprises switch means for coupling said transmitting means without being through a failed port when a failure has occurred in any one of said N ports.
79. A network according to claim 78, wherein each of said N ports comprises an input terminal and an output terminal, and said switch means comprises first and second optical switches arranged on said transmitting means, said first and second optical switches corresponding to each of said output and input terminals, and a transmission channel for directly connecting said first and second optical switches corresponding to each of each output and input terminals of each of said N
ports.
ports.
80. A network according to claim 18, wherein said optical concentrator is a first optical concentrator, and one of said N ports comprises a repeating port, and said optical coupler comprises a first tree coupler for dividing the second optical signal input from said repeating port to all ports except for said repeating port, and a second tree coupler for transmitting the second optical signal input from all the ports except for said repeating port to said repeating port, and said network further comprising a second optical concentrator which connects to said repeating port.
81. A network according to claim 80, said first optical concentrator further comprising:
first demultiplexing means, arranged at said repeating port, for demultiplexing the first and second optical signals input from said repeating port, and guiding the first optical signal to said transmitting means and the second optical signal to said first tree coupler; and second demultiplexing means, arranged at each port except for said repeating port, for demultiplexing the first and second optical signals input from each port, and guiding the first signal to said transmitting means and the second optical signal to said second tree coupler.
first demultiplexing means, arranged at said repeating port, for demultiplexing the first and second optical signals input from said repeating port, and guiding the first optical signal to said transmitting means and the second optical signal to said first tree coupler; and second demultiplexing means, arranged at each port except for said repeating port, for demultiplexing the first and second optical signals input from each port, and guiding the first signal to said transmitting means and the second optical signal to said second tree coupler.
82. A network according to claim 81, wherein said first optical concentrator further comprises first multiplexing means, arranged at said repeating port, for multiplexing the first optical signal transmitted through said transmitting means and the second optical signal output from said second tree coupler, and outputting the multiplexed signal to said repeating port, and second multiplexing means, arranged at each port except for said repeating port, for multiplexing the first optical signal transmitted through said transmitting means and the second optical signal output from said first tree coupler, and outputting a multiplexed signal to each port except for said repeating port.
83. A network according to claim 81, wherein said repeating port comprises an input unit and an output unit, and said first concentrator further comprises switch means for selectively and directly inputting the first and second optical signals output from said output unit of said repeating port to said input unit of said repeating port.
Applications Claiming Priority (13)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30296392 | 1992-10-15 | ||
| JP4-302963 | 1992-10-15 | ||
| JP12263793 | 1993-05-25 | ||
| JP5-122637 | 1993-05-25 | ||
| JP5-169200 | 1993-07-08 | ||
| JP5169200A JPH0775143A (en) | 1993-05-25 | 1993-07-08 | Concentrator and communication network using the same |
| JP5-176773 | 1993-07-16 | ||
| JP05176773A JP3143546B2 (en) | 1993-07-16 | 1993-07-16 | Concentrator, communication network using the same, and failure recovery method in the communication network |
| JP5-253055 | 1993-10-08 | ||
| JP5-277764 | 1993-10-08 | ||
| JP25305493A JP3334966B2 (en) | 1993-10-08 | 1993-10-08 | Concentrator and optical communication network using the same |
| JP25305593A JP3334967B2 (en) | 1993-10-08 | 1993-10-08 | Concentrator and optical communication network using the same |
| JP5-253054 | 1993-10-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2108305A1 CA2108305A1 (en) | 1994-04-16 |
| CA2108305C true CA2108305C (en) | 1998-09-22 |
Family
ID=27552616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2108305 Expired - Fee Related CA2108305C (en) | 1992-10-15 | 1993-10-13 | Optical concentrator and optical communication network using the same |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2108305C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6493117B1 (en) | 1997-08-27 | 2002-12-10 | Nortel Networks Limited | WDM optical network with passive pass-through at each node |
-
1993
- 1993-10-13 CA CA 2108305 patent/CA2108305C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6493117B1 (en) | 1997-08-27 | 2002-12-10 | Nortel Networks Limited | WDM optical network with passive pass-through at each node |
| US6529300B1 (en) | 1997-08-27 | 2003-03-04 | Nortel Networks Limited | WDM optical network with passive pass-through at each node |
| US6556321B1 (en) | 1997-08-27 | 2003-04-29 | Nortel Networks Limited | WDM optical network and switching node with pilot tone communications |
| US6563615B2 (en) | 1997-08-27 | 2003-05-13 | Nortel Networks Limited | Technique for detecting noise on a data channel |
| US6631018B1 (en) | 1997-08-27 | 2003-10-07 | Nortel Networks Limited | WDM optical network with passive pass-through at each node |
| US6748174B2 (en) | 1997-08-27 | 2004-06-08 | Nortel Networks Limited | WDM optical network with passive pass-through at each node |
| US6751418B2 (en) | 1997-08-27 | 2004-06-15 | Nortel Networks Limited | WDM optical network with passive pass-through at each node |
| US6757498B2 (en) | 1997-08-27 | 2004-06-29 | Nortel Networks Limited | WDM optical network with passive pass-through at each node |
| US6775479B2 (en) | 1997-08-27 | 2004-08-10 | Nortel Networks Corporation | WDM optical network with passive pass-through at each node |
| US6795652B2 (en) | 1997-08-27 | 2004-09-21 | Nortel Networks Limited | WDM optical network with passive pass-through at each node |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2108305A1 (en) | 1994-04-16 |
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