Transmitter circuit, optical module, and communications device

An optical module, comprising a transmitter circuit and a receiver circuit, the transmitter circuit comprising a driver and a directly modulated laser (DML), wherein

• a positive electrode of the driver is connected to a positive electrode of the DML, a negative electrode of the DML is connected to a voltage terminal, and the negative electrode of the DML is connected to a ground terminal through a capacitor;
• the driver is configured to generate a drive current based on an input signal, and output the drive current to the DML through the positive electrode of the driver;
• and
• the DML is configured to output a first part of current of the drive current to the ground terminal through the capacitor, and output a second part of current of the drive current to the voltage terminal.

A package, comprising:

• a capacitor;
• a driver;
• and
• a directly modulated laser (DML), wherein:
• a positive electrode of the driver is connected to a positive electrode of the DML, a negative electrode of the DML is connected to a voltage terminal, the negative electrode of the DML is connected to a ground terminal through the capacitor, and the capacitor is surface mounted to the DML;
• the driver is configured to generate a drive current based on an input signal, and output the drive current to the DML through the positive electrode of the driver;
• and
• the DML is configured to output a first part of current of the drive current to the ground terminal through the capacitor, and output a second part of current of the drive current to the voltage terminal.