Patent US4473745A successfully refreshed from Google Patents.
US4473745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical receiver with series-connected p-i-n diodes
Assignee: Nortel Networks Ltd
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Filing: 1982-02-09
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Granted: 1984-09-25
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Expires: 2002-02-09
Abstract
Abstract An optical receiver, for responding to optical energy propagating in an optical fibre transmission path (2) is detected by a reverse-biassed p-i-n diode (3) which is connected in series with a forward-biassed p-i-n diode (7). The junction between the two diodes is connected to the input of an amplifier (5), which is part of a two-stage amplifier (5,8), with automatic equalization (9,10,11). The forward biassed diode, by its characteristics leads to an improved dynamic range for the receiver as compared with conventional optical receivers.
Inventors
- 👤 David P. M. Chown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:02
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69; H04B10/691; H04B10/6911
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
100 words
An optical receiver for receiving optical energy from an optical fibre transmission link, which includes a reverse-biassed p-i-n diode onto which light from the optical fibre link is directed, so that the diode generates a photo-current whose value depends on the magnitude of the incident optical power, a forward-biassed p-i-n diode connected in series with the reverse-biassed diode so that the photo-current flows in the forward-biassed diode, said forward-biassed diode having a resistance that, at frequencies above 10 Mb/s, falls as the incident optical power increases and an amplifier whose input is connected to the junction between the two diodes.
Claim 2
Dependent Claim
100 words
An optical receiver for receiving optical energy from an optical fibre transmission link, which includes a reverse-biassed p-i-n diode onto which light from the optical fibre link is directed, so that the diode generates a photo-current whose value depends on the magnitude of the incident optical power, a forward-biassed p-i-n diode connected in series with the reverse-biassed diode so that the photo-current flows in the forward-biassed diode, said forward-biassed diode having a resistance that, at frequencies above 10 Mb/s, falls as the incident optical power increases and an amplifier whose input is connected to the junction between the two diodes.
Claim 3
Dependent Claim
67 words
An optical receiver as claimed in claim 1 wherein said amplifier comprises two stages and an equilization control, said equalization control comprising a field effect transistor and a feedback control circuit, said feedback control connected between the output of said amplifier and the gate of said transistor, said transistor having its source and drain connected across a coupling capacitor, said capacitor being connected between said two stages.
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) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |