Optical transmission device and communication device

An optical transmission device comprising:

• a light source;
• a spatial light modulator including a modulation part where a plurality of modulation regions that is irradiated with light emitted from the light source is set, the spatial light modulator modulating a phase of the radiated light in each of the plurality of modulation regions that is set in the modulation part;
• a wave plate disposed in an optical path of modulated light that is modulated in each of the plurality of modulation regions set in the modulation part of the spatial light modulator, the wave plate converting the modulated light that is modulated in each of the plurality of modulation regions to mutually different polarization states;
• and
• a curved surface mirror having a curved reflection surface irradiated with the modulated light that is converted to the mutually different polarization states, the curved surface mirror reflecting the modulated light converted to the mutually different polarization states at a projection angle in accordance with a curvature of the reflection surface.