US5371354A
Expired / Lapsed
US
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Resonance-type optical receiver circuit and method of receiving light wave
Assignee: NEC Corp
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Filing: 1993-11-02
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Granted: 1994-12-06
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Expires: 2013-11-02
Abstract
Abstract The present invention provides a resonance-type optical receiver circuit which keeps predetermined small distortion even when the received light level becomes high. The resonance-type optical receiver circuit varies the resistance value of variable resistance element 80, which is used as a load resistor to optical detector 4, in response to the intensity of output signal 10 of an amplifier. The load resistor varies in response to a variations of the received light level of the optical detector in this manner to keep the input to the amplifier lower than a fixed value.
Inventors
- 👤 Wataru Domon
- 👤 Makoto Shibutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:05
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69; H04B10/697; H04B10/6973; H04B10/691; H04B10/6911
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
A resonance-type optical receiver circuit including an optical detector, an amplifier and a tuning circuit interposed between said optical detector and said amplifier, characterized in that said optical receiver circuit comprises a PIN diode provided as a load resistor to said optical detector for automatically varying its resistance value in response to a light signal and means responsive to a received photo-electric current of said optical detector for providing a bias current to keep the input level to said amplifier lower than a fixed value.
Claim 2
Dependent Claim
85 words
A resonance-type optical receiver circuit including an optical detector, an amplifier and a tuning circuit interposed between said optical detector and said amplifier, characterized in that said optical receiver circuit comprises a PIN diode provided as a load resistor to said optical detector for automatically varying its resistance value in response to a light signal and means responsive to a received photo-electric current of said optical detector for providing a bias current to keep the input level to said amplifier lower than a fixed value.
Claim 3
Independent Claim
67 words
A method of receiving the light waves of a resonance-type optical receiver circuit including an optical detector, an amplifier and a tuning circuit interposed between said optical detector and said amplifier, characterized in that said method comprises the procedure of varying the tuning frequency in response to the received level of said optical detector to keep the input level to said amplifier lower than a fixed value.
Claim 4
Independent Claim
67 words
A method of receiving the light waves of a resonance-type optical receiver circuit including an optical detector, an amplifier and a tuning circuit interposed between said optical detector and said amplifier, characterized in that said method comprises the procedure of varying the tuning frequency in response to the received level of said optical detector to keep the input level to said amplifier lower than a fixed value.
Claim 5
Dependent Claim
101 words
A resonance-type optical receiver circuit including an optical detector, an amplifier and a tuning circuit interposed between said optical detector and said amplifier, characterized in that said optical receiver circuit comprises a resistance element through which a received photoelectric current of said optical detector flows, and a control circuit for generating the voltage of the difference between a voltage drop of said resistance element and a predetermined reference voltage and feeding back said difference voltage as a bias voltage to said optical detector to vary the tuning frequency to keep the input level to said amplifier lower than a fixed value.
Claim 6
Dependent Claim
101 words
A resonance-type optical receiver circuit including an optical detector, an amplifier and a tuning circuit interposed between said optical detector and said amplifier, characterized in that said optical receiver circuit comprises a resistance element through which a received photoelectric current of said optical detector flows, and a control circuit for generating the voltage of the difference between a voltage drop of said resistance element and a predetermined reference voltage and feeding back said difference voltage as a bias voltage to said optical detector to vary the tuning frequency to keep the input level to said amplifier lower than a fixed value.
References Cited (Backward Citations)
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