Patent US3215841A successfully refreshed from Google Patents.
US3215841A
Expired / Lapsed
US
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Light modulator
Assignee: AT&T Inc
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Filing: 1962-11-30
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Granted: 1965-11-02
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Expires: 1982-11-30
Abstract
No abstract record available.
Inventors
- 👤 Richard L Fork
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:31
CPC Classifications
H; H01; H01S; H01S1/00; H01S3/00; H01S3/10; H01S3/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
AN OPTICAL AMPLIFIER-MODULATOR COMPRISING AN ACTIVE MEDIUM HAVING AN ENERGY LEVEL STRUCTURE CHARACTERIZED BY A PLURALITY OF DISCRETE ENERGY LEVELS INCLUDING A PAIR OF OPTICALLY CONNECTED LEVELS HAVING A SEPARATION CORRESPONDING TO THE WAVELENGTH OF THE LIGHT TO BE AMPLIFIED AND MODULATED, MEANS DEFINING A LIGHT BEAM PATH THROUGH SAID MEDIUM, MEANS FOR INDUCING IN SAID MEDIUM A FIELD-DEPENDENT ANISOTROPY TO CAUSE SAID MEDIUM TO INTERACT DIFFERENTLY WITH LIGHT WAVE ENERGY OF DIFFERENT POLARIZATIONS, MEANS FOR VARYING SAID ANISOTROPY IN ACCORDANCE WITH SIGNAL INFORMATION THEREBY VARYING THE INTERACTION OF SAID MEDIUM WITH SAID LIGHT WAVE ENERGY AND MODULATING SAID BEAM, AND MEANS FOR PUMPING SAID MEDIUM TO PRODUCE THEREIN A POPULATION INVERSION BETWEEN SAID PAIR OF OPTICALLY CONNECTED ENERGY LEVELS, SAID POPULATION INVERSION RESULTING SIMULTANEOUSLY IN REVERSAL OF THE MODULATED CHANGES IN POLARIZATION DIRECTION AND IN AMPLIFICATION OF SAID BEAM.
Claim 2
Dependent Claim
140 words
AN OPTICAL AMPLIFIER-MODULATOR COMPRISING AN ACTIVE MEDIUM HAVING AN ENERGY LEVEL STRUCTURE CHARACTERIZED BY A PLURALITY OF DISCRETE ENERGY LEVELS INCLUDING A PAIR OF OPTICALLY CONNECTED LEVELS HAVING A SEPARATION CORRESPONDING TO THE WAVELENGTH OF THE LIGHT TO BE AMPLIFIED AND MODULATED, MEANS DEFINING A LIGHT BEAM PATH THROUGH SAID MEDIUM, MEANS FOR INDUCING IN SAID MEDIUM A FIELD-DEPENDENT ANISOTROPY TO CAUSE SAID MEDIUM TO INTERACT DIFFERENTLY WITH LIGHT WAVE ENERGY OF DIFFERENT POLARIZATIONS, MEANS FOR VARYING SAID ANISOTROPY IN ACCORDANCE WITH SIGNAL INFORMATION THEREBY VARYING THE INTERACTION OF SAID MEDIUM WITH SAID LIGHT WAVE ENERGY AND MODULATING SAID BEAM, AND MEANS FOR PUMPING SAID MEDIUM TO PRODUCE THEREIN A POPULATION INVERSION BETWEEN SAID PAIR OF OPTICALLY CONNECTED ENERGY LEVELS, SAID POPULATION INVERSION RESULTING SIMULTANEOUSLY IN REVERSAL OF THE MODULATED CHANGES IN POLARIZATION DIRECTION AND IN AMPLIFICATION OF SAID BEAM.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |