Patent US3984824A successfully refreshed from Google Patents.
US3984824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide-band optical analog signal link using fiber optics
Assignee: United States Department of the Army
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Filing: 1975-07-25
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Granted: 1976-10-05
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Expires: 1995-07-25
Abstract
Abstract An analog signal is provided to a transistor circuit which shapes the sig to enhance the high frequency components thereof. An LED receives the enhanced signal so that a normally degraded light signal from an LED is compensated for thereby generating light signals that correspond with the original analog input. Fiber optics connect the LED to a receiver circuit, that detects the light communicated across fiber optics, and reconverts them to an electrical signal corresponding to the original analog input signal at the transmitter.
Inventors
- 👤 James C. Blackburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:15
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/50; H04B10/501; H04B10/502; H04B10/58
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
111 words
In an analog signal lines system, a transmitter comprising: an input terminal for accepting an analog signal thereat; pre-emphasis means connected in circuit with the input terminal for emphasizing the high frequency components of the signal; emitter-follower means connected to the output of the pre-emphasis means for further emphasizing the high frequency components of the signal; at least one LED driven by the output of the emitter-follower means for generating a light output in response to the high frequency emphasized input signal, the light output corresponding linearly to the input analog signal; and stabilization means connected to the LED for ensuring linear performance of the LED over its entire operating range.
Claim 2
Dependent Claim
111 words
In an analog signal lines system, a transmitter comprising: an input terminal for accepting an analog signal thereat; pre-emphasis means connected in circuit with the input terminal for emphasizing the high frequency components of the signal; emitter-follower means connected to the output of the pre-emphasis means for further emphasizing the high frequency components of the signal; at least one LED driven by the output of the emitter-follower means for generating a light output in response to the high frequency emphasized input signal, the light output corresponding linearly to the input analog signal; and stabilization means connected to the LED for ensuring linear performance of the LED over its entire operating range.
Claim 3
Dependent Claim
35 words
The subject matter set forth in claim 1 together with fiber optic means, a light output end thereof disposed adjacent the LED for communicating the light output to an opposite end of the fiber optic.
Claim 4
Dependent Claim
90 words
The subject matter of claim 2 wherein the pre-emphasis means includes a transistor having a first terminal connected in circuit with the input signal, a second terminal connected to the emitter-follower means, and a third terminal connected to a parallel RC combination of components, and together with means for amplifying the input signal connected between the input terminal and the pre-emphasis means, and further wherein the emitter-follower means has a parallel RC combination of components connected between the output of the emitter-follower means and an anode terminal of the LED.
Claim 5
Dependent Claim
86 words
The subject matter set forth in claim 3 together with a receiver disposed at an opposite end of the fiber optic means for receiving the light output from the transmitter, the receiver comprising: photo-detector means for converting the light output to a corresponding electrical receiver signal; means connected to the output of the photo-detector means for amplifying the receiver signal; and terminal means connected to the output of the amplifying means for producing thereat, a utilizeable signal corresponding to the input analog signal at the transmitter.
Claim 6
Dependent Claim
18 words
The subject matter set forth in claim 4 wherein the photo-detector means is a silicon avalanche type photodetector.
Claim 7
Dependent Claim
84 words
The subject matter of claim 2 together with a receiver disposed at an opposite end of the fiber optic means for receiving the light output from the transmitter, the receiver comprising: photo-detector means for converting the light output to a corresponding electrical receiver signal; means connected to the output of the photo-detector means for amplifying the receiver signal; and terminal means connected to the output of the amplifying means for producing thereat, a utilizeable signal corresponding to the input analog signal at the transmitter.
Claim 8
Dependent Claim
47 words
The subject matter set forth in claim 6 wherein the amplifying means comprises at least one stage of amplification, and further wherein the output of the photo-detector means is directly connected to an input of the amplifying means for optimizing the high frequency response of the receiver.
Claim 9
Dependent Claim
44 words
The subject matter of claim 1 wherein the pre-emphasis means includes a transistor having a first terminal connected in circuit with the input signal, a second terminal connected to the emitter-follower means, and a third terminal connected to a parallel RC combination of components.
Claim 10
Dependent Claim
23 words
The subject matter of claim 1 together with means for amplifying the input signal connected between the input terminal and the pre-emphasis means.
Claim 11
Dependent Claim
32 words
The subject matter of claim 1 wherein the emitter-follower means has a parallel RC combination of components connected between the output of the emitter-follower means and an anode terminal of the LED.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |