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EP0249056A2
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Two-way optical fiber transmission network
Assignee: Hitachi Ltd
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Filing: 1987-05-18
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Granted: —
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Expires: 2007-05-18
Abstract
Abstract A two-way optical fiber transmission network comprises: a center that transmits and receives information; a plurality of areas each containing a plurality of subscribers using information from the center; an optical star coupler connected at least with a plurality of subscribers in the area which is in the shortest distance to the center; an optical fiber cable connecting the optical star coupler with the center; and optical fiber cables connecting the plurality of subscribers in the remaining areas with the center.
Inventors
- 👤 Katsuyuki Imoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 16:16
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/0001; H04B; H04B10/00; H04B10/25; H04B10/2589; H04Q11/0062; H04Q2011/0079; H04Q2011/0081
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
95 words
A two-way optical fiber transmission network comprising: a center that transmits and receives information; first and second areas each consisting of a plurality of subscribers who are using information from the center, the distance between the first area and the center being shorter than that between the center and the second area; an optical star coupler connected with the plurality of subscribers in the first area; an optical fiber cable connecting the optical star coupler with the center; and optical fiber cables each connecting the plurality of subscribers in the second area with the center.
Claim 2
Dependent Claim
95 words
A two-way optical fiber transmission network comprising: a center that transmits and receives information; first and second areas each consisting of a plurality of subscribers who are using information from the center, the distance between the first area and the center being shorter than that between the center and the second area; an optical star coupler connected with the plurality of subscribers in the first area; an optical fiber cable connecting the optical star coupler with the center; and optical fiber cables each connecting the plurality of subscribers in the second area with the center.
Claim 3
Dependent Claim
43 words
A two-way optical fiber transmission network as set forth in claim 1, in which the first area comprising: a spare optical star coupler with a plurality of branch ports; and an optical fiber cable connecting the spare optical star coupler with the center.
Claim 4
Dependent Claim
23 words
A two-way optical fiber transmission network as set forth in claim 1, in which the optical star coupler has a spare branch port.
Claim 5
Dependent Claim
7 words
A two-way optical fiber transmission network comprising:
Claim 6
Dependent Claim
7 words
A two-way optical fiber transmission network comprising:
Claim 7
Dependent Claim
84 words
a center that transmits and receives information; a plurality of areas each consisting of a plurality of subscribers who are using information from the center; one or more optical star couplers connected at least with a plurality of subscribers in the area which is, among the areas, closest to the center; one or more optical fiber cables connecting the one or more optical star couplers with the center; and optical fiber cables connecting the plurality of subscribers in the remaining areas with the center.
Claim 8
Dependent Claim
84 words
a center that transmits and receives information; a plurality of areas each consisting of a plurality of subscribers who are using information from the center; one or more optical star couplers connected at least with a plurality of subscribers in the area which is, among the areas, closest to the center; one or more optical fiber cables connecting the one or more optical star couplers with the center; and optical fiber cables connecting the plurality of subscribers in the remaining areas with the center.
Claim 9
Dependent Claim
47 words
A two-way optical fiber transmission network as set forth in claim 4, in which the area having the optical star couplers comprises: a spare optical star coupler with a plurality of branch ports; and an optical fiber cable connecting the spare optical star coupler with the center.
Claim 10
Dependent Claim
23 words
A two-way optical fiber transmission network as set forth in claim 4, in which the optical star couplers have a spare branch port.
References Cited (Backward Citations)
US4726643A
Cited
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