US5202780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical communication system for the subscriber area
Assignee: Alcatel Lucent NV
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Filing: 1990-04-17
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Granted: 1993-04-13
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Expires: 2010-04-17
Abstract
Abstract A group of subscribers serviced from a center has a common remote distribution unit located in its vicinity. The subscribers are connected to this remote distribution unit by individual lines, preferably optical waveguides. A single optical waveguide connects the center to the remote distribution unit. Subscriber-assigned signals with subscriber-assigned wavelengths and signals to be distributed to all subscribers in the direction from the center to the subscribers are transmitted as a multiplexed optical signal, using wavelength-division multiplexing, to the remote distribution unit. The optical signal containing the signals to be distributed is separated out at the remote distribution unit and is distributed by optical means to the subscribers. The subscriber-assigned signals are also separated in the remote distribution unit into individual signals and are transmitted to the subscribers over individual lines. In the opposite direction from the subscribers to the center, the signals to be transmitted from the subscribers to the center are also transmitted over the individual lines with subscriber-assigned wavelength to the remote distribution unit where they are grouped into an optical multiplexed signal and are transmitted to the center over an optical waveguide. A suitable selection of the wavelengths makes possible a simple multiplexed formation and multiplexed resolution of the various signals.
Inventors
- 👤 Kurt Fussanger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:06
CPC Classifications
H; H04; H04J; H04J14/00; H04J14/02; H04J14/0278; H04J14/0282; H04J14/0226; H04J14/0227; H04J14/0228; H04J14/023; H04J14/0232; H04J14/0241; H04J14/0242; H04J14/0245; H04J14/0246; H04J14/0249; H04J14/025; H04N; H04N7/00; H04N7/16; H04N7/173; H04N7/22
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
342 words
An optical communication system for transmitting subscriber-assigned information signals in two directions between a center and a plurality of subscribers. wherein for each of a plurality of groups of subscribers, a remote distribution unit is provided in the vicinity of said group of subscribers, wherein the subscriber-assigned information signals to be transmitted from the center to said group of subscribers are first transmitted to the remote distribution unit over a single optical waveguide using wavelength-division multiplexing with subscriber-assigned wavelengths, wherein in the remote distribution unit, a wavelength-division multiplexed signal received from the center is separated by optical means into individual optical signals having the subscriber-assigned wavelength, wherein said optical signals re transmitted from the remote distribution unit in individual optical signals having the subscriber-assigned wavelengths, wherein said optical signals are transmitted from the remote distribution unit to the subscribers over individual lines, and wherein the subscriber-assigned information signals to be transmitted from said group of subscribers to the center are transmitted from the subscribers to the remote distribution unit over the individual lines, and thence to the center over the same optical waveguide using the wavelength-division multiplexing with subscriber-assigned wavelengths, characterized in that, using an additional wavelength which is common to all subscribers, a composite signal containing signals to be distributed from the center to the subscribers is transmitted over the same optical waveguide from the center to the remote distribution unit, where it is separated from the wavelength-division multiplexed signal and distributed, by optical means and over individual lines to the subscribers of said group, that a wavelength band containing the subscriber-assigned wavelengths is clearly separated from a wavelength band containing the additional wavelength, that the subscriber-assigned wavelengths used for transmission from the center to the subscribers lie in a first wavelength band, and the subscriber-assigned wavelengths used for transmission from the subscribers to the center line in a second wavelength band, said first and second wavelength bands being separated by a predetermined distance, and that in each of the two wavelength hands, adjacent wavelengths are separated by a short distance.
Claim 2
Dependent Claim
342 words
An optical communication system for transmitting subscriber-assigned information signals in two directions between a center and a plurality of subscribers. wherein for each of a plurality of groups of subscribers, a remote distribution unit is provided in the vicinity of said group of subscribers, wherein the subscriber-assigned information signals to be transmitted from the center to said group of subscribers are first transmitted to the remote distribution unit over a single optical waveguide using wavelength-division multiplexing with subscriber-assigned wavelengths, wherein in the remote distribution unit, a wavelength-division multiplexed signal received from the center is separated by optical means into individual optical signals having the subscriber-assigned wavelength, wherein said optical signals re transmitted from the remote distribution unit in individual optical signals having the subscriber-assigned wavelengths, wherein said optical signals are transmitted from the remote distribution unit to the subscribers over individual lines, and wherein the subscriber-assigned information signals to be transmitted from said group of subscribers to the center are transmitted from the subscribers to the remote distribution unit over the individual lines, and thence to the center over the same optical waveguide using the wavelength-division multiplexing with subscriber-assigned wavelengths, characterized in that, using an additional wavelength which is common to all subscribers, a composite signal containing signals to be distributed from the center to the subscribers is transmitted over the same optical waveguide from the center to the remote distribution unit, where it is separated from the wavelength-division multiplexed signal and distributed, by optical means and over individual lines to the subscribers of said group, that a wavelength band containing the subscriber-assigned wavelengths is clearly separated from a wavelength band containing the additional wavelength, that the subscriber-assigned wavelengths used for transmission from the center to the subscribers lie in a first wavelength band, and the subscriber-assigned wavelengths used for transmission from the subscribers to the center line in a second wavelength band, said first and second wavelength bands being separated by a predetermined distance, and that in each of the two wavelength hands, adjacent wavelengths are separated by a short distance.
Claim 3
Dependent Claim
38 words
A system as claimed in claim 1, characterized in that the two wavelength bands containing the subscriber-assigned wavelengths are centered about approximately 1300 nm, and that the band containing the additional wavelength is centered about approximately 1500 nm.
Claim 4
Dependent Claim
43 words
A system as claimed in claim 1, characterized in that in each of the wavelength bands containing the subscriber-assigned wavelengths, adjacent wavelengths are separated by only 1 to 5 nm, and that the two wavelength bands are separated by 20 to 80 nm.
Claim 5
Dependent Claim
19 words
A system as claimed in claim 1 characterized in that the individual lines are three optical waveguides per subscriber.
Claim 6
Dependent Claim
16 words
A system as claimed in claim 1, characterized in that the individual lines are electric lines.
Claim 7
Dependent Claim
62 words
A system as claimed in claim 1, characterized in that the individual lines are a single optical waveguide per subscriber and that in the remote distribution unit and at the subscribers, optical multiplexer-demultiplexers are provided which permit the different optical signals to be transmitted between the remote distribution unit and the subscribers over the single optical waveguide per subscriber using wavelength-division multiplexing.
Claim 8
Dependent Claim
86 words
A system as claimed in claim 1, characterized in that the individual lines are two optical waveguides per subscriber, that the optical signal containing the signals to be distributed to the subscribers, which has the additional wavelength, is transmitted over one of said two optical waveguide, and that in the remote distribution unit and at the subscribers, optical duplexers are provided which permit duplex transmission of the different optical signals between the remote distribution unit and the subscriber over the other of said two optical waveguides.
Claim 9
Dependent Claim
38 words
A system as claimed in claim 1, characterized in that the two wavelength bands containing the subscriber-assigned wavelengths are centered about approximately 1500 nm, and that the band containing the addition wavelength is centered about approximately 1300 nm.
Claim 10
Dependent Claim
19 words
A system as claimed in claim 2, characterized in that the individual lines are three optical waveguides per subscriber.
Claim 11
Dependent Claim
19 words
A system as claimed in claim 3, characterized in that the individual lines are three optical waveguides per subscriber.
Claim 12
Dependent Claim
19 words
A system as claimed in claim 8, characterized in that the individual lines are three optical waveguides per subscriber.
Claim 13
Dependent Claim
16 words
A system as claimed in claim 2, characterized in that the individual lines are electric lines.
Claim 14
Dependent Claim
16 words
A system as claimed in claim 3, characterized in that the individual lines are electric lines.
Claim 15
Dependent Claim
16 words
A system as claimed in claim 8, characterized in that the individual lines are electric lines.
Claim 16
Dependent Claim
62 words
A system as claimed in claim 2, characterized in that the individual lines are a single optical waveguide per subscriber, and that in the remote distribution unit and at the subscribers, optical multiplexer-demultiplexers are provided which permit the different optical signals to be transmitted between the remote distribution unit and the subscribers over the single optical waveguide per subscriber using wavelength-division multiplexing.
Claim 17
Dependent Claim
62 words
A system as claimed in claim 3, characterized in that the individual lines are a single optical waveguide per subscriber, and that in the remote distribution unit and at the subscribers, optical multiplexer-demultiplexers are provided which permit the different optical signals to be transmitted between the remote distribution unit and the subscribers over the single optical waveguide per subscriber using wavelength-division multiplexing.
Claim 18
Dependent Claim
62 words
A system as claimed in claim 8, characterized in that the individual lines are a single optical waveguide per subscriber, and that in the remote distribution unit and at the subscribers, optical multiplexer-demultiplexers are provided which permit the different optical signals to be transmitted between the remote distribution unit and the subscribers over the single optical waveguide per subscriber using wavelength-division multiplexing.
Claim 19
Dependent Claim
86 words
A system as claimed in claim 2, characterized in that the individual lines are two optical waveguides per subscriber, that the optical signal containing the signals to be distributed to the subscribers, which has the additional wavelength, is transmitted over one of said two optical waveguides, and that in the remote distribution unit and at the subscribers, optical duplexers are provided which permit duplex transmission of the different optical signals between the remote distribution unit and the subscriber over the other of said two optical waveguides.
Claim 20
Dependent Claim
86 words
A system as claimed in claim 3, characterized in that the individual lines are two optical waveguides per subscribers, that the optical signal containing the signals to be distributed to the subscribers, which has the additional wavelength, is transmitted over one of said two optical waveguides, and that in the remote distribution unit and at the subscribers, optical duplexers are provided with permit duplex transmission of the different optical signals between the remote distribution unit and the subscriber over the other of said two optical waveguides.
Claim 21
Dependent Claim
86 words
A system as claimed in claim 8, characterized in that the individual lines are two optical waveguides per subscriber, that the optical signal containing the signals to be distributed to the subscribers, which has the additional wavelength, is transmitted over one of said two optical waveguides, and that in the remote distribution unit and at the subscribers, optical duplexers are provided which permit duplex transmission of the different optical signals between the remote distribution unit and the subscriber over the other of said two optical waveguides.
References Cited (Backward Citations)
DE3220817A1
Cited
DE3632047A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |