Offset quadrature phase-shift-keying method and optical transmitter using the same

摘要

Disclosed is an optical transmitter using an offset quadrature phase-shift-keying (OQPSK) method. The method includes: a first phase modulator for outputting a first signal beam generated by phase-modulating an input beam based on a first data; a second phase modulator for outputting a second signal beam generated by phase-modulating the input beam based on a second data; a phase delay unit for granting a predetermined phase difference between the first signal beam and the second signal beam; and an optical coupler for coupling the first signal beam and the second signal beam between which the phase difference exists.