US4644145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical receiver with electrically variable attenuator
Assignee: Alcatel Lucent Deutschland AG
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Filing: 1985-04-30
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Granted: 1987-02-17
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Expires: 2005-04-30
Abstract
Abstract An optical receiver which consists of an optical attenuator, an optical-to-electrical transducer, an amplifier, and an automatic level control circuit. The optical attenuator is an electrooptical modulator which is electrically controlled by the automatic level control circuit.
Inventors
- 👤 Hans M. Gundner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:28
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/67; H04B10/671; H04B10/672; H04B10/674
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
Optical receiver consisting of an optical attenuator (1), an optical-to-electrical transducer (2), an amplifier (3), and an automatic level control circuit (4), for controlling the level of a signal provided from said amplifier characterized in that the attenuation introduced by the optical attenuator (1) is electrically variable by an electronic control voltage provided to said optical attenuator from said automatic level control circuit which includes a peak detector for producing said electronic control voltage.
Claim 2
Dependent Claim
74 words
Optical receiver consisting of an optical attenuator (1), an optical-to-electrical transducer (2), an amplifier (3), and an automatic level control circuit (4), for controlling the level of a signal provided from said amplifier characterized in that the attenuation introduced by the optical attenuator (1) is electrically variable by an electronic control voltage provided to said optical attenuator from said automatic level control circuit which includes a peak detector for producing said electronic control voltage.
Claim 3
Dependent Claim
44 words
An optical receiver as claimed in claim 1, characterized in that the optical attenuator (1) is the control element of an automatic control system the other elements of which are the optical-to-electrical transducer (2), the amplifier (3), and the automatic level control circuit (4).
Claim 4
Dependent Claim
61 words
An optical receiver as claimed in claim 2, characterized in that, in addition to the optical attenuator (1), either the optical-to-electrical transducer (2) or the amplifier (3) (or both) is (are) the control element of the automatic control system, and that an electronic control voltage provided to said transducer and said amplifier are produced in the automatic level control circuit (4).
Claim 5
Dependent Claim
24 words
An optical receiver as claimed in claim 1 characterized in that the optical attenuator (1) is a semiconductor-base or LiNbO 3 -base electrooptical modulator.
Claim 6
Dependent Claim
21 words
An optical receiver as claimed in claim 1 characterized in that the optical attenuator (1) is incorporated in an optical connector.
Claim 7
Dependent Claim
35 words
An optical receiver as claimed in claim 1 characterized in that the optical attenuator (1), the optical-to-electrical transducer (2), the amplifier (3), and the automatic level control circuit (4) are integrated on a single chip.
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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |