US5058102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband optical communication system, particularly for the subscriber area
Assignee: Alcatel Lucent NV
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Filing: 1990-01-29
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Granted: 1991-10-15
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Expires: 2010-01-29
Abstract
Abstract In optical communication systems for transmitting a plurality of broadband signals, particularly television signals, over an optical waveguide, the signals are modulated onto carriers of different frequencies, and the modulated carriers are transmitted as frequency-division-multiplex signals. The carrier frequencies lie in different frequency bands (B 1 , B 2 , B 3 ) each of which is not more than one octave wide and which are spaced at least one octave apart. This makes it possible to adapt the system step by step to channel requirements using conventional, proven transmission equipment for the individual frequency bands.
Inventors
- 👤 Rolf Heidemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:58
CPC Classifications
H; H04; H04J; H04J14/00; H04J14/02; H04J14/0298
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
System for optically transmitting a plurality of different broadband signals, the system comprising a plurality of modulators which respectively modulate each of said broadband signals onto a corresponding carrier frequency within a corresponding one of at least two different carrier frequency bands wherein each said carrier frequency band is not more than one octave wide and is at least one octave apart from all the other said carrier frequency bands, and a ;combiner circuit which combines all said carrier frequencies in all said carrier frequency bands into a single frequency-multiplexed signal to be transmitted.
Claim 2
Dependent Claim
94 words
System for optically transmitting a plurality of different broadband signals, the system comprising a plurality of modulators which respectively modulate each of said broadband signals onto a corresponding carrier frequency within a corresponding one of at least two different carrier frequency bands wherein each said carrier frequency band is not more than one octave wide and is at least one octave apart from all the other said carrier frequency bands, and a ;combiner circuit which combines all said carrier frequencies in all said carrier frequency bands into a single frequency-multiplexed signal to be transmitted.
Claim 3
Dependent Claim
42 words
A system as claimed in claim 1, wherein a first said carrier frequency band is 0.95 to 1.75 GHz, a second said carrier frequency band is 3.5 to 4.3 GHz, and a third said carrier frequency band is 8.6 to 11.0 GHz.
Claim 4
Dependent Claim
23 words
A system as claimed in claim 1, wherein the carrier frequencies in the carrier frequency bands are spaced at least 40 MHz apart.
Claim 5
Dependent Claim
36 words
A system as claimed in claim 1, wherein the broadband signals include video-telephone signals and other broadband signals, and both the video-telephone signals and the other broadband signals are frequency modulated on their respective carrier frequencies.
Claim 6
Dependent Claim
51 words
A system as claimed in claim 1, wherein the broadband signals include a predetermined type of digital data signals and other broadband signals, and at least the predetermined type of digital data signals i modulated on a first group of said carrier frequencies lying in a first said carrier frequency band.
Claim 7
Dependent Claim
53 words
A system as claimed in claim 1, wherein in a first direction of transmission, a predetermined type of broadband signals are transmitted over an optical waveguide using a first wavelength, and in the opposite direction of transmission, said predetermined type of signals are transmitted over the same optical waveguide using a second wavelength.
References Cited (Backward Citations)
US4532543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |