Patent ID: 8265489

Claim:
An optical field transmitter comprising: a light source; one or more digital-analog converters; and an optical field modulator, wherein: the optical field transmitter modulates an information signal sampled at predetermined time intervals into an optical field signal and transmitting the optical field signal obtained by the modulation; the information signal includes one of multilevel signals arranged irregularly on a complex plane and multilevel signals arranged by combining mutually different numbers of phase values in at least two amplitude values; the optical field transmitter further comprises a phase pre-accumulation circuit for outputting phase pre-accumulation complex information obtained by previously accumulating a phase component of the information signal at predetermined time intervals; the one or more digital-analog converters each converts the information signal including the output phase pre-accumulation complex information into an analog signal, and inputs the analog signal obtained by the conversion to the optical field modulator; and the optical field modulator modulates light output from the light source into the optical field signal by using the analog signal, and transmits the optical field signal obtained by the modulation.