Patent US6115162A successfully refreshed from Google Patents.
US6115162A
Expired / Lapsed
US
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Double side band, carrier suppressed modulated coherent fiber optic link
Assignee: Harris Corp
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Filing: 1995-01-10
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Granted: 2000-09-05
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Expires: 2015-01-10
Abstract
Abstract A system for conveying a signal by optical fiber may include a converter for converting a radio frequency signal to an optical frequency signal, the converter having an interferometer modulator for providing a carrier suppressed optical frequency signal having a sideband modulated by the radio frequency signal, an optical amplifier for amplifying the modulated sideband before transmission on an optical fiber by an amount that is greater than or approximates the transmission loss in the system, a local oscillator, a coupler, and detector for converting (superheterodyning) the modulated sideband from the optical fiber to a predetermined intermediate radio frequency.
Inventors
- 👤 David Graves
- 👤 Greg Daugherty
- 👤 Robert Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:44
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/50; H04B10/60
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
82 words
A system for conveying a signal by optical fiber that has been received on a radio frequency, the system comprising: means for providing a carrier suppressed optical frequency carrier having a sideband modulated by the signal; an optical amplifier for amplifying the modulated sideband before transmission on an optical fiber by at least approximately the same amount as the transmission loss; and a local oscillator and coupler for converting the modulated sideband from the optical fiber to a predetermined intermediate radio frequency.
Claim 2
Independent Claim
82 words
A system for conveying a signal by optical fiber that has been received on a radio frequency, the system comprising: means for providing a carrier suppressed optical frequency carrier having a sideband modulated by the signal; an optical amplifier for amplifying the modulated sideband before transmission on an optical fiber by at least approximately the same amount as the transmission loss; and a local oscillator and coupler for converting the modulated sideband from the optical fiber to a predetermined intermediate radio frequency.
Claim 3
Dependent Claim
23 words
The system of claim 1 wherein said means for providing the carrier suppressed optical frequency carrier comprises means for providing double sidebands thereof.
Claim 4
Dependent Claim
21 words
The system of claim 2 wherein said means for providing the suppressed carrier optical frequency carrier comprises a Mach-Zehnder interferometer modulator.
Claim 5
Dependent Claim
24 words
The system of claim 1 further comprising an optical bandpass filter for suppressing an image of the intermediate radio frequency in the modulated sideband.
Claim 6
Dependent Claim
11 words
The system of claim 4 wherein-said filter comprises a Mach-Zehnder interferometer.
Claim 7
Dependent Claim
22 words
The system of claim 1 wherein said means for providing the optical frequency carrier comprises means for providing a single sideband thereof.
Claim 8
Independent Claim
68 words
A system for conveying a signal by optical fiber that has been received on a radio frequency, the system comprising: a laser for providing an optical frequency carrier; an electro-optic modulator for modulating the signal on a double sideband, carrier suppressed version of the optical frequency carrier; and an optical amplifier for amplifying the double sidebands of the modulated optical frequency carrier before conveyance on an optical fiber.
Claim 9
Independent Claim
68 words
A system for conveying a signal by optical fiber that has been received on a radio frequency, the system comprising: a laser for providing an optical frequency carrier; an electro-optic modulator for modulating the signal on a double sideband, carrier suppressed version of the optical frequency carrier; and an optical amplifier for amplifying the double sidebands of the modulated optical frequency carrier before conveyance on an optical fiber.
Claim 10
Dependent Claim
31 words
The system of claim 7 further comprising a tunable laser local oscillator and coupler for converting the amplified double sidebands conveyed on the optical fiber to a predetermined intermediate radio frequency.
Claim 11
Independent Claim
121 words
A system for conveying a signal by optical fiber that has been received on a radio frequency, the system comprising: a laser for providing an optical frequency carrier; a Mach-Zehnder interferometer modulator for suppressing the optical frequency carrier and for modulating the signal on the double sidebands of the optical frequency carrier; an optical amplifier for amplifying the modulated double sidebands before transmission on an optical fiber by approximately the same amount the carrier was suppressed; an optical bandpass filter for suppressing an image of the intermediate radio frequency in the double sidebands conveyed by the optical fiber; and a laser local oscillator and coupler for converting the double sidebands conveyed by the optical fiber to a predetermined intermediate radio frequency.
Claim 12
Independent Claim
121 words
A system for conveying a signal by optical fiber that has been received on a radio frequency, the system comprising: a laser for providing an optical frequency carrier; a Mach-Zehnder interferometer modulator for suppressing the optical frequency carrier and for modulating the signal on the double sidebands of the optical frequency carrier; an optical amplifier for amplifying the modulated double sidebands before transmission on an optical fiber by approximately the same amount the carrier was suppressed; an optical bandpass filter for suppressing an image of the intermediate radio frequency in the double sidebands conveyed by the optical fiber; and a laser local oscillator and coupler for converting the double sidebands conveyed by the optical fiber to a predetermined intermediate radio frequency.
Claim 13
Independent Claim
74 words
A method of conveying a signal by optical fiber that has been received on a radio frequency, the method comprising the steps of: (a) modulating a sideband of a carrier suppressed optical frequency carrier with the signal; (b) amplifying the modulated sideband before transmission on an optical fiber by approximately the same amount the carrier was suppressed; and (c) converting the modulated sideband received on the optical fiber to a predetermined intermediate radio frequency.
Claim 14
Independent Claim
74 words
A method of conveying a signal by optical fiber that has been received on a radio frequency, the method comprising the steps of: (a) modulating a sideband of a carrier suppressed optical frequency carrier with the signal; (b) amplifying the modulated sideband before transmission on an optical fiber by approximately the same amount the carrier was suppressed; and (c) converting the modulated sideband received on the optical fiber to a predetermined intermediate radio frequency.
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) | 2003-09-05 | 2004-03-06 | 2004-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-09-05 | 2008-03-06 | 2008-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-09-05 | 2012-03-06 | 2012-09-05 | $7700.00 | Window Closed / Lapsed |