Optical detection device and transceiver device

An optical detection device comprising:

• a first magnetic element including a first ferromagnetic layer, a second ferromagnetic layer, and a first spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer, wherein when the first ferromagnetic layer is irradiated with light including an optical signal, the first magnetic element generates a first voltage signal in response to the optical signal;
• a second magnetic element including a third ferromagnetic layer, a fourth ferromagnetic layer, and a second spacer layer sandwiched between the third ferromagnetic layer and the fourth ferromagnetic layer, wherein when the third ferromagnetic layer is simultaneously irradiated with the light, the second magnetic element generates a second voltage signal in opposite phase to the first voltage signal corresponding to the optical signal;
• and
• a differential synthesis circuit that differentially synthesizes a first total voltage signal including the first voltage signal output from the first magnetic element and a second total voltage signal including the second voltage signal output from the second magnetic element including the second voltage signal.