US5013903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightwave receiver having differential input
Assignee: Nokia Bell Labs
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Filing: 1990-02-26
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Granted: 1991-05-07
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Expires: 2010-02-26
Abstract
Abstract A lightwave receiver, suitable for CATV applications, includes an input photodiode that is capacitively coupled to the differential inputs of a balanced amplifier. Biasing of the photodiode may be achieved by connecting the photodiode in series between a pair of resistors, with the differential inputs being taken from either side of the photodiode. This arrangement avoids the use of a transformer, which exhibits considerable high frequency loss, thereby avoiding the bandwidth limitation inherent with a transformer.
Inventors
- 👤 Bryon L. Kasper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:06
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69; H04B10/697; H04B10/6973
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
A lightwave receiver comprising a photodetector capacitively coupled to first and second differential inputs of an amplifier having first and second outputs. and further comprising means for supplying a DC bias voltage to said photodetector; characterized in that said means for supplying a DC bias voltage comprises a first feedback resistor connected from said first input to a first output of said amplifier, and a second feedback resistor connected from said second input to a second output of said amplifier.
Claim 2
Dependent Claim
80 words
A lightwave receiver comprising a photodetector capacitively coupled to first and second differential inputs of an amplifier having first and second outputs. and further comprising means for supplying a DC bias voltage to said photodetector; characterized in that said means for supplying a DC bias voltage comprises a first feedback resistor connected from said first input to a first output of said amplifier, and a second feedback resistor connected from said second input to a second output of said amplifier.
Claim 3
Dependent Claim
43 words
The lightwave receiver of claim 1 wherein said photodetector is a photodiode, the cathode of said photodiode is coupled to said first input through a first capacitor, and the anode of said photodiode is coupled to said second input through a second capacitor.
Claim 4
Dependent Claim
18 words
The lightwave receiver of claim 1 wherein said first resistor and said second resistor have equal resistance values.
Claim 5
Dependent Claim
78 words
A lightwave receiver comprising a photodetector capacitively coupled to first and second differential inputs of an amplifier having first and second outputs, and further comprising means for supplying a DC bias voltage to said photodetector; characterized in that said means for supplying a DC bias voltage comprises a first inductor connected between said first input and a positive DC power supply conductor, and a second inductor connected between said second input and a negative DC power supply conductor.
Claim 6
Dependent Claim
78 words
A lightwave receiver comprising a photodetector capacitively coupled to first and second differential inputs of an amplifier having first and second outputs, and further comprising means for supplying a DC bias voltage to said photodetector; characterized in that said means for supplying a DC bias voltage comprises a first inductor connected between said first input and a positive DC power supply conductor, and a second inductor connected between said second input and a negative DC power supply conductor.
Claim 7
Dependent Claim
43 words
The lightwave receiver of claim 4 wherein said photodetector is a photodiode, the cathode of said photodiode is coupled to said first input through a first capacitor, and the anode of said photodiode is coupled to said second input through a second capacitor.
Claim 8
Dependent Claim
48 words
The lightwave receiver of claim 4 wherein said means for supplying a DC bias voltage further comprises a first resistor connected between said first input and a positive DC power supply conductor, and a second resistor connected between said second input and a negative DC power supply conductor.
Claim 9
Dependent Claim
18 words
The lightwave receiver of claim 6 wherein said first resistor and said second resistor have equal resistance values.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |