OPTICAL TRANSMITTER

Provided is an optical transmitter (12) that can obtain stable light output even when control of switching between outputting a modulation signal input into at least one optical modulator of a plurality of cascade-connected optical modulators and stopping outputting the modulation signal is executed. The optical transmitter (12) includes an optical modulator (110) configured to modulate input light and outputs a light signal (110b), a drive unit (111a) configured to output a modulation data signal (110a) to the optical modulator (110), and a bias controller (114) configured to perform feedback control of bias voltage applied to the optical modulator (110). During a modulation OFF operation of the optical modulator (110), the bias controller (114) switches a control target point from a first control target point to a second control target point and executes the feedback control.