An optical transmitter including two reflective regions formed at two opposite ends of an interference region along a first direction and at least three electrodes electrically coupled to the interference region, where the amount of electrical carriers inside the interference region can be modulated by changing the relative electrical fields among the three electrodes, so that the amount of photons generated inside the interference region can be modulated and resonant along the first direction and emit along a second direction that is different from the first direction.