Patent ID: 7929584

Claim:
A light source mode alignment device, comprising: a laser, a signal processing unit, and a temperature control unit, wherein the laser is configured to convert an incident light into a current signal, amplify the current signal and convert the amplified current signal into a voltage signal; wherein the signal processing unit is configured to obtain a voltage signal containing power fluctuation information according to the voltage signal from the laser; wherein the signal processing unit further comprises a modulator, a phase discriminator, and a bias voltage generator; wherein the modulator is configured to generate a modulation signal; the phase discriminator, configured to generate the integral value of a product of multiplying the voltage signal of the signal procession unit and the modulation signal of the modulator and output the integral value to the bias voltage generator; wherein the bias voltage generator is configured to output bias voltage according to the integral value; wherein the temperature control unit is connected to the laser, configured to generate a voltage through a weighted addition operation between the bias voltage output by the bias voltage generator and the modulation signal generated by the modulator, and apply the voltage to the laser to control temperature of the laser.