Patent ID: 7415053

Claim:
An optical transmitter, comprising: a first laser diode having an anode and a cathode; a first driver connected to the anode of the first laser diode, the first driver receiving a first driving signal; a second laser diode having an anode and a cathode, the anode of the second laser diode being connected in serial to the cathode of the first laser diode; a second driver connected to the cathode of the second laser diode, the second driver receiving a second driving signal different from the first driving signal; an impedance device connected between the anode of the first laser diode and the cathode of the second laser diode; and a compensating circuit connected to the cathode of the first laser diode and the anode of the second laser diode, wherein the impedance device, the first laser diode, and the second laser diode form a closed loop and have an impedance substantially the same with respect to each other, and wherein the first laser diode is driven only by the first driving signal independently of the second driving signal and the second laser diode is driven only by the second driving signal independently of the first driving signal.