PHASE MODULATOR, PHASE MODULATOR CONTROL METHOD, AND STRIP PROJECTION DEVICE

摘要

A phase modulator 10 includes one or more waveguides that include at least one first waveguide 21 and a plurality of heaters disposed on a substrate 12. The plurality of heaters include a first heater 31 that heats the first waveguide 21, and a second heater that heats a position 21 spaced from the first waveguide. The plurality of heaters are operated so that the total power consumption of the plurality of heaters is constant. The plurality of heaters may be operated so that the change of the power consumption of the first heater 31 and the change of the power consumption of the second heater 32 compensate each other.