Coherent combining photoelectric conversion apparatus

A coherent combining photoelectric conversion apparatus that is a wireless transmission apparatus configured to transmit, from a transmission antenna, a wireless signal obtained by modulating a carrier signal with a baseband signal including an information signal, the wireless transmission apparatus comprising:

• a micro-optical resonator that is excited by laser light and is configured to generate an optical frequency comb having a frequency interval frep that is 100 GHz or more and 3 THz or less;
• a modulated signal generation unit configured to separate a first optical frequency mode pair and a second optical frequency mode pair, each of which is constituted by adjacent optical frequency modes, from the optical frequency comb, the modulated signal generation unit including a first modulation unit configured to optically modulate one optical frequency mode included in the first optical frequency mode pair using the baseband signal and a second modulation unit configured to optically modulate one optical frequency mode included in the second optical frequency mode pair using the baseband signal;
• a photoelectric conversion element unit including one or more photoelectric conversion elements configured to mix the optical frequency modes of each pair to generate a group of high-frequency electromagnetic wave signals having a frequency interval equal to the frequency interval frep;
• and
• a phase offset adjustment unit configured to adjust a phase difference between the group of high-frequency electromagnetic wave signals.