BIAS CONTROL CIRCUIT FOR OPTICAL MODULATOR, AND OPTICAL TRANSMITTER COMPRISING THE SAME

摘要

A bias control circuit for an optical modulator including a pair of optical waveguides and a power monitor is disclosed. The bias control circuit includes a bias generator, a differential amplifier, and a controller. The bias generator provides a bias signal to one of the optical waveguides. The bias signal includes a dither signal having a predetermined frequency. The differential amplifier receives a monitor signal from the power monitor and a reference signal, and generates an amplified signal corresponding to a difference between the monitor signal and the reference signal. The controller detects frequency components contained in the amplified signal. The frequency components originates from the dither signal. The controller generates a control signal according to intensity of the frequency components. The bias signal is adjusted according to the control signal provided from the controller.

主权项

1. A bias control circuit for an optical modulator including a pair of optical waveguides and a power monitor, comprising:
a bias generator configured to provide a bias signal to one of the optical waveguides, the bias signal including a dither signal having a predetermined frequency; a differential amplifier configured to receive a monitor signal from the power monitor and a reference signal, and generate an amplified signal corresponding to a difference between the monitor signal and the reference signal; and a controller configured to detect frequency components contained in the amplified signal and originating from the dither signal, and generate a control signal according to intensity of the frequency components, wherein the bias signal is adjusted according to the control signal provided from the controller.