Optical module

The invention discloses an optical module comprising a laser emitting unit, an MCU (Microprogrammed Control Unit) and a heating control circuit, wherein the laser emitting unit comprises a laser and a drive circuit of the laser; the drive circuit drives the laser to emit an optical signal according to a digital differential electric signal received by the optical module; a heating resistor is arranged in the laser;, the MCU is used for obtaining a temperature value detected by a temperature sensor and then determining a voltage output value corresponding to the temperature value; and according to the determined voltage output value, a corresponding voltage is output to the control end of the heating control circuit from a DAC (Digital-to-Analog Converter) output port of the MCU to control current flowing by the heating resistor. The heating resistor is built in the laser, the MCU is used for controlling the current flowing by the heating resistor through the simple heating control circuit, and no expensive la