Photodetector with improved signal-to-noise ratio
First Claim
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1. A photodetector/receiver circuit comprising:
- a voltage source having a positive and a negative terminal;
a first resistor connected between said positive terminal and the cathode of a photodetector diode;
a second resistor substantially equal in resistance value to said first resistor, connected between said negative terminal and the anode of said photodetector diode;
said anode and cathode capacitively coupled, one to the inverting input of a differential amplifier, and the other to the noninverting input; and
the output of said differential amplifier comprising the output of said photodetector/receiver circuit.
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Abstract
A novel photodetector circuit utilizing both the generated photovoltage, as well as its inverse, to improve the signal-to-noise ratio at the optical receiver output.
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Citations
2 Claims
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1. A photodetector/receiver circuit comprising:
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a voltage source having a positive and a negative terminal; a first resistor connected between said positive terminal and the cathode of a photodetector diode; a second resistor substantially equal in resistance value to said first resistor, connected between said negative terminal and the anode of said photodetector diode; said anode and cathode capacitively coupled, one to the inverting input of a differential amplifier, and the other to the noninverting input; and the output of said differential amplifier comprising the output of said photodetector/receiver circuit. - View Dependent Claims (2)
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Specification
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Current AssigneeNorthern Telecom Limited (Nortel Networks Corporation)
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Original AssigneeNorthern Telecom Limited (Nortel Networks Corporation)
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InventorsWitkowicz, Tadeusz
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Primary Examiner(s)Nelms, David C.
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Assistant Examiner(s)Hostetter, Darwin R.
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Application NumberUS05/842,622Time in Patent Office484 DaysField of Search250/214 A, 250/214 RUS Class Current250/214.00ACPC Class CodesH01J 40/14 Circuit arrangements not ad...
