Patent ID: 7020170

Claim:
An optoelectronic transceiver, comprising: a receive optical subassembly; a postamplifier in communication with the receive optical subassembly; a transmit optical subassembly that includes an optical transmitter; and a driver in communication with the transmit optical subassembly and comprising: an input; an output; and an operational amplifier configured to communicate with the transmit optical subassembly by way of the output, and comprising: a first stage including a differential amplifier configured to receive a reference voltage input and an optical transmitter voltage input and having transconductance that increases exponentially as a difference between the reference voltage and the optical transmitter voltage increases, wherein the differential amplifier generates an output current based on the input, the optical transmitter voltage representing an optical output strength of the optical transmitter, the reference voltage corresponding to a desired magnitude of the optical transmitter voltage; a second stage including a capacitor, the second stage integrating the output current to generate a first output voltage; and a third stage including an output buffer, the third stage configured to receive as input the first output voltage to generate a second output voltage approximately equal to the first output voltage, the second output voltage controlling a bias current for the optical transmitter.