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Patent US4953156A successfully refreshed from Google Patents.
US4953156A
Expired / Lapsed
US
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Wideband subcarrier multiplexed optical communication system operating over more than one octave
Assignee: Verizon Laboratories Inc
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Filing: 1988-09-08
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Granted: 1990-08-28
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Expires: 2008-09-08
Abstract
Abstract An optical communication system includes an optical transmitter for transmitting a subcarrier multiplexed optical signal through a single mode optical fiber to an optical receiver. The optical transmitter includes a semiconductor laser diode for generating a light beam. The laser diode is preferably a high speed InGaAsP laser diode emitting in a spectral range of 1.3-1.6 micrometers. The light beam is intensity modulated with a composite modulation signal to provide the optical signal for transmission. The composite modulation signal includes multiple modulated microwave carriers that cover a total bandwidth greater than one octave. Harmonics and intermodulation products do not interfere with transmission, and a favorable signal-to-noise ratio or bit error rate is maintained when the bandwidth of the composite modulation signal exceeds one octave.
Inventors
- 👤 Robert Olshansky
- 👤 Paul M. Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:44
CPC Classifications
H; H04; H04J; H04J14/00; H04J14/02; H04J14/0298
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
Apparatus for transmitting an optical signal, comprising: a semiconductor laser diode for generating a light beam; means for generating and modulating a plurality of microwave carriers; means for combining said microwave carriers to provide a composite modulation signal in a frequency range between about 2 and 20 gigahertz, said composite modulation signal having a total bandwidth greater than one octave; and means for coupling said composite modulation signal to said laser diode for modulation of said light beam to provide an optical signal for transmission.
Claim 2
Dependent Claim
85 words
Apparatus for transmitting an optical signal, comprising: a semiconductor laser diode for generating a light beam; means for generating and modulating a plurality of microwave carriers; means for combining said microwave carriers to provide a composite modulation signal in a frequency range between about 2 and 20 gigahertz, said composite modulation signal having a total bandwidth greater than one octave; and means for coupling said composite modulation signal to said laser diode for modulation of said light beam to provide an optical signal for transmission.
Claim 3
Dependent Claim
26 words
Optical transmitting apparatus as defined in claim 1 wherein said laser diode comprises a high speed InGaAsP laser emitting in a spectral range of 1.3-1.6 micrometers.
Claim 4
Dependent Claim
124 words
Optical communication apparatus comprising: transmitter means including means for generating a light beam and means for intensity modulating the light beam with a composite modulation signal in a frequency range between about 2 and 20 gigahertz to provide an optical signal, said composite modulation signal comprising a plurality of modulated microwave carriers that cover a total bandwidth greater than one octave; receiver means remotely located from said transmitter means, including a photodetector responsive to said optical signal for providing a received signal having a carrier-to-noise ratio greater than about 16 dB and a receiver for separating and demodulating at least one of said microwave carriers from said received signal; and means for coupling said optical signal from said transmitter means to said receiver means.
Claim 5
Dependent Claim
124 words
Optical communication apparatus comprising: transmitter means including means for generating a light beam and means for intensity modulating the light beam with a composite modulation signal in a frequency range between about 2 and 20 gigahertz to provide an optical signal, said composite modulation signal comprising a plurality of modulated microwave carriers that cover a total bandwidth greater than one octave; receiver means remotely located from said transmitter means, including a photodetector responsive to said optical signal for providing a received signal having a carrier-to-noise ratio greater than about 16 dB and a receiver for separating and demodulating at least one of said microwave carriers from said received signal; and means for coupling said optical signal from said transmitter means to said receiver means.
Claim 6
Dependent Claim
18 words
Optical communication apparatus as defined in claim 3 wherein said coupling means comprises a single mode optical fiber.
Claim 7
Independent Claim
76 words
A method for transmitting an optical signal comprising the steps of: generating a light beam with a semiconductor laser diode; intensity modulating the light beam with a composite modulation signal to provide an optical signal for transmission, said composite modulation signal comprising a plurality of modulation microwave carriers in a frequency range between about 2 and 20 gigahertz and having a total bandwidth greater than one octave; and transmitting the optical signal to a remote location.
Claim 8
Independent Claim
76 words
A method for transmitting an optical signal comprising the steps of: generating a light beam with a semiconductor laser diode; intensity modulating the light beam with a composite modulation signal to provide an optical signal for transmission, said composite modulation signal comprising a plurality of modulation microwave carriers in a frequency range between about 2 and 20 gigahertz and having a total bandwidth greater than one octave; and transmitting the optical signal to a remote location.
Claim 9
Dependent Claim
29 words
A method for transmitting an optical signal as defined in claim 5 wherein the step of transmitting the optical signal includes transmitting the optical signal on an optical fiber.
Claim 10
Dependent Claim
33 words
A method for transmitting an optical signal as defined in claim 5 further including the steps of generating said modulated microwave carriers, and adding said modulated carries to provide said composite modulation signal.
Claim 11
Dependent Claim
31 words
A method for transmitting an optical signal as defined in claim 5 wherein the step of generating a light beam includes generating a light beam with a high speed InGaAsP laser.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |