US4253734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro optical modulation system
Assignee: Mitsubishi Electric Corp
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Filing: 1979-10-22
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Granted: 1981-03-03
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Expires: 1999-10-22
Abstract
Abstract An electro optical modulation system utilizes electro optical effect of a crystal. The electro optical modulation system comprises a voltage comparator for comparing a modulated light intensity signal with a reference voltage; and a bias controlling device which feeds a differential signal between mean value signal of the output of the voltage comparator and mean value signal of the inverted output of the voltage comparator, to an optical modulator as a bias voltage.
Inventors
- 👤 Satoshi Komurasaki
- 👤 Isao Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:48
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/0121; G02F1/0123
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
116 words
An electro optical modulation system which comprises a voltage comparator for comparing a modulated light intensity signal as an output of an optical modulator with a reference voltage so as to output two voltage signals; an inversion circuit for inverting the output of said voltage comparator; a first mean value circuit for the mean value of the output of said voltage comparator; a second mean value circuit for the mean value of the output of said inversion circuit; a differential amplifier for receiving the outputs of said first and second mean value circuits respectively as the first and second inputs; and a bias amplifier for feeding the output of said differential amplifier into said optical modulator.
Claim 2
Dependent Claim
116 words
An electro optical modulation system which comprises a voltage comparator for comparing a modulated light intensity signal as an output of an optical modulator with a reference voltage so as to output two voltage signals; an inversion circuit for inverting the output of said voltage comparator; a first mean value circuit for the mean value of the output of said voltage comparator; a second mean value circuit for the mean value of the output of said inversion circuit; a differential amplifier for receiving the outputs of said first and second mean value circuits respectively as the first and second inputs; and a bias amplifier for feeding the output of said differential amplifier into said optical modulator.
Claim 3
Dependent Claim
20 words
An electro optical modulation system according to claim 1 wherein said optical modulator utilizes electro optical effect of a crystal.
References Cited (Backward Citations)
US3409376A
Cited
US3675022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |