EP0488241A2
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EP
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Optical frequency division multiplexing network
Assignee: Hitachi Ltd
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Filing: 1991-11-27
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Granted: —
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Expires: 2011-11-27
Abstract
Abstract An optical frequency division multiplexing network includes first optical communication paths (300, 400) connected to terminals (20), respectively, a second optical communication path (100, 200) connected to the outside and a node (10) composed of a selection unit (600) for selecting signals having optical frequencies to be sent to the plurality of terminals (20), respectively, from signals transmitted through the second optical communication path (100, 200) in optical frequency division multiplexing, a conversion unit (601) for converting the selected signals into signals having a single optical frequency and an output unit for producing the converted signals to the terminals (20) through the first optical communication paths (300, 400), respectively.
Inventors
- 👤 Atsushi Takai
- 👤 Ryoji Hitachi Daiyon Kyoshinryo Takeyari
- 👤 Akihiko Takase
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 10:36
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/0001; H04Q11/0062; H04J; H04J14/00; H04J14/02; H04J14/0201; H04J14/0202; H04J14/0204; H04J14/0205; H04J14/0206; H04J14/0209; H04J14/0213; H04Q11/0005; H04Q2011/0007; H04Q2011/0009; H04Q2011/0011; H04Q2011/0013; H04Q2011/0015; H04Q2011/0037; H04Q2011/0039; H04Q2011/0086
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
97 words
A network wherein a signal is transmitted in optical frequency division multiplexing fashion to a node to which at least one first optical communication path is connected, said signal transmission being effected through a second optical communication path, and the multiplexed and transmitted signal is distributed to a terminal through said first optical communication path, and wherein said node selects a signal having an optical frequency to be sent to said first optical communication path from the multiplexed and transmitted signal and optical frequency converts the selected signal to be distributed to said first optical communication path.
Claim 2
Dependent Claim
42 words
A network according to Claim 1, wherein a specific signal is selected from said multiplexed and transmitted signal in accordance with each of said first optical communication paths and is optical frequency converted to be distributed to said first optical communication path.
Claim 3
Dependent Claim
32 words
A network according to Claim 1, wherein a specific signal is selected from said multiplexed and transmitted signal and is optical frequency converted to be distributed to said first optical communication path.
Claim 4
Dependent Claim
25 words
A network according to Claim 1, wherein a plurality of signals are distributed to said first optical communication path in optical frequency division multiplexing fashion.
Claim 5
Dependent Claim
32 words
A network according to Claim 1, wherein said optical frequency conversion is made for each of the selected signals having an optical frequency to be sent to said first optical communication path.
Claim 6
Dependent Claim
33 words
A network according to Claim 1, wherein said optical frequency conversion is made simultaneously for a plurality of selected signals having an optical frequency to be sent to said first optical communication path.
Claim 7
Dependent Claim
53 words
A network according to Claim 1, wherein the optical frequency of the selected signal to be sent to said first optical communication path by said optical frequency conversion is identical regardless of said first optical communication path, or is part of a predetermined frequency group, or is a frequency corresponding to a terminal.
Claim 8
Dependent Claim
22 words
A network according to Claim 1, wherein assignment of frequency for multiplex transmission in said second optical communication path is made dynamically.
Claim 9
Dependent Claim
25 words
A network according to Claim 1, wherein at least one of frequencies of multiplexed signals on said second optical communication path is assigned for control.
Claim 10
Dependent Claim
56 words
A network including a node for collecting signals from terminals through a third optical communication paths and for producing said collected signals to a fourth optical communication path, wherein signals transmitted from said third optical communication paths are optical frequency converted and are then optical frequency multiplexed to be sent to said fourth optical communication path.
Claim 11
Dependent Claim
24 words
A network according to Claim 10, wherein transmission of signals in said third optical communication paths is made in optical frequency division multiplexing fashion.
Claim 12
Dependent Claim
36 words
A network according to Claim 10, wherein transmission of signals in said third optical communication paths is made in optical frequency division multiplexing fashion and optical frequency conversion is made for each of frequency demultiplexed signals.
Claim 13
Dependent Claim
34 words
A network according to Claim 10, wherein transmission of signals in said third optical communication paths is made in optical frequency division multiplexing fashion and a plurality of signals are optical frequency converted simultaneously.
Claim 14
Dependent Claim
43 words
A network according to Claim 10, wherein optical frequency of signals transmitted through said third optical communication paths is identical regardless of said third optical communication paths, or is part of a predetermined frequency group, or is a frequency corresponding to a terminal.
Claim 15
Dependent Claim
22 words
A network according to Claim 10, wherein assignment of frequency for multiplex transmission in said fourth optical communication path is made dynamically.
Claim 16
Dependent Claim
25 words
A network according to Claim 10, wherein at least one of frequencies of multiplexed signals on said second optical communication path is assigned for control.
Claim 17
Dependent Claim
32 words
A network comprising a single optical fiber cable constituting said first or second optical communication path defined in Claim 1 and said third or fourth optical communication path defined in Claim 12.
Claim 18
Dependent Claim
38 words
A network according to Claim 17, wherein distribution of one or a plurality of signals and collection of one or a plurality of signals in said optical communication path are made in optical frequency division multiplexing fashion simultaneously.
Claim 19
Dependent Claim
19 words
A network according to Claim 17, wherein both ends of said optical communication path are connected to said node.
Claim 20
Dependent Claim
19 words
A network according to Claim 19, wherein a direction of transmitting signals in said optical communication path is unidirectional.
Claim 21
Dependent Claim
67 words
A network according to Claim 1, wherein signal is distributed to one or a plurality of said terminals connected to said optical communication path by optical demultiplexing from said first optical communication path, or by optical division from said first optical communication path, or by optically dividing optical signal from said first optical communication path and selecting one specific optical frequency or a plurality of optical frequencies.
Claim 22
Dependent Claim
33 words
A network according to Claim 10, wherein signal from one or a plurality of said terminals connected to said optical communication path is collected by optical multiplexing to said third optical communication path.
Claim 23
Dependent Claim
55 words
A network according to Claim 19, wherein signal is distributed to one or a plurality of terminals connected to said optical communication path by optical demultiplexing from said optical communication path and part or all of optical frequencies of signals distributed to said terminals are used to collect signals from said terminals by optical multiplexing.
Claim 24
Dependent Claim
18 words
A network according to Claim 1, wherein selection and optical frequency conversion of said signal are made simultaneously.
Claim 25
Dependent Claim
113 words
An optical frequency division multiplexing network including a plurality of terminals, a plurality of first optical communication paths connected to said plurality of terminals, respectively, a node connected to said plurality of first optical communication paths and a second optical communication path for connecting said node to outside, wherein said node comprises means for selecting signals having optical frequencies to be sent to said plurality of terminals, respectively, from signals transmitted through said second optical communication path in optical frequency division multiplexing fashion, means for converting said selected signals to signals having a single optical frequency, and means for producing said converted signals to said terminals through said first optical communication paths, respectively.
Claim 26
Dependent Claim
104 words
An optical frequency division multiplexing network including a plurality of terminals, a plurality of first optical communication paths connected to said plurality of terminals, respectively, a node connected to said plurality of first optical communication paths and a second optical communication path for connecting said node to outside, wherein said node comprises means for converting signals having a single optical frequency transmitted from said terminals through said first optical communication paths, respectively, to signals having optical frequencies corresponding to said terminals, respectively, and means for producing said converted signals to the outside through said second optical communication paths in optical frequency division multiplexing fashion.
References Cited (Backward Citations)
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