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US 4,415,803 AGranted
Optical receiver with improved dynamic range
AssigneeBell Telephone Laboratories, Incorporated
InventorTran V. Muoi
Life of this patent
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AssigneeBell Telephone Laboratories, Incorporated
InventorTran V. Muoi
Estimating the term…
An optical receiver having enhanced dynamic range is achieved through the use of a variable impedance shunt 203 disposed at the receiver input. The optical receiver comprises an optical detector 102 serially connected to a transimpedance amplifier 201. The optical detector 102 receives an optical signal having a variable optical power level and modulation bandwidth and generates a corresponding electrical current therefrom. The transimpedance amplifier provides a fixed amount of gain and converts the electrical current to an output voltage. An automatic gain control circuit 202 produces a control signal which varies in response to the amplitude of the output voltage. The control signal is applied to the variable impedance device to vary the impedance therein. This maintains the output voltage at a predetermined amplitude over the modulation bandwidth without any significant reduction in receiver sensitivity.
An optical receiver circuit for an incoming optical signal having a variable power level and a modulation bandwidth, said circuit comprising
Dependencies are inferred from the claim text.