US4295225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber optic repeater
Assignee: Harris Corp
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Filing: 1978-08-18
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Granted: 1981-10-13
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Expires: 1998-08-18
Abstract
Abstract A fiber optic repeater includes a photodetector stage, an amplification and pulse sharpening stage and a driven stage for an injection laser diode, the three stages being made up of only three MESFETs, preferably of the GaAs type and each stage being similar to the other stages in configuration so as to lend itself to MSI or LSI fabrication of a very simplified and reliable microwave frequency optical repeater.
Inventors
- 👤 Jing-Jong Pan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:10
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/29
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
62 words
A fiber optic repeater comprising a photodetector circuit including an optic detecting MESFET coupled in said photodetector circuit to sense an optic input applied to the gate of said MESFET, an amplification and pulse sharpening circuit and a driver circuit connected in cascade with said photodetector circuit, said amplification and pulse sharpening circuit and said driver circuit each including a single MESFET.
Claim 2
Dependent Claim
62 words
A fiber optic repeater comprising a photodetector circuit including an optic detecting MESFET coupled in said photodetector circuit to sense an optic input applied to the gate of said MESFET, an amplification and pulse sharpening circuit and a driver circuit connected in cascade with said photodetector circuit, said amplification and pulse sharpening circuit and said driver circuit each including a single MESFET.
Claim 3
Dependent Claim
17 words
A fiber optic repeater as defined in claim 1, wherein each of said MESFETs are GaAs MESFETs.
Claim 4
Dependent Claim
23 words
A fiber optic repeater as defined in claim 2 wherein said driver circuit includes an injection laser diode connected to the MESFET therein.
Claim 5
Dependent Claim
86 words
A fiber optic repeater comprising a photodetector circuit including an optic detecting MESFET coupled in said photodetector circuit to sense an optic input applied to the gate of said MESFET, an amplification and pulse sharpening circuit and a driver circuit connected in cascade, said amplification and pulse sharpening circuit and said driver circuit each including a MESFET, first bias voltage means connected to said MESFET for providing the gate-source bias thereof, and second bias voltage means connected to said MESFET for providing the drain-source bias thereof.
Claim 6
Dependent Claim
86 words
A fiber optic repeater comprising a photodetector circuit including an optic detecting MESFET coupled in said photodetector circuit to sense an optic input applied to the gate of said MESFET, an amplification and pulse sharpening circuit and a driver circuit connected in cascade, said amplification and pulse sharpening circuit and said driver circuit each including a MESFET, first bias voltage means connected to said MESFET for providing the gate-source bias thereof, and second bias voltage means connected to said MESFET for providing the drain-source bias thereof.
Claim 7
Dependent Claim
26 words
A fiber optic repeater as defined in claim 4, wherein an injection laser diode is connected to the drain of said MESFET in said driver circuit.
Claim 8
Dependent Claim
32 words
A fiber optic repeater as defined in claim 4, wherein said first bias voltage means includes a negative voltage source, an RF choke coil and an impedance matching network connected in series.
Claim 9
Dependent Claim
32 words
A fiber optic repeater as defined in claim 4, wherein said second bias voltage means includes a positive voltage source, an RF choke coil and an impedance matching network connected in series.
Claim 10
Dependent Claim
24 words
A fiber optic repeater as defined in claim 4, wherein said photodetector circuit has the same configuration as said amplification and pulse sharpening circuit.
Claim 11
Dependent Claim
22 words
A fiber optic repeater as defined in claims 4, 5, 6, 7 or 8, wherein each of said MESFETs are GaAs MESFETs.
Claim 12
Dependent Claim
18 words
A photodetector circuit as defined in claim 1 or 4, wherein said MESFET is a dual gate MESFET.
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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) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |