Patent ID: 9608732
Date: 2017-03-28
CPC Classifications: H04B,H04J

Claim:
1. An optical transmitter, comprising: a first optical quadrature modulator performing a phase modulation on a first continuous light beam and outputting a first transmitting light beam; a second optical quadrature modulator performing a phase modulation on a second continuous light beam belonging in the same frequency band as that of the first continuous light beam and outputting a second transmitting light beam; an optical phase difference adding unit adding an optical phase difference varying temporally between the first transmitting light beam and the second transmitting light beam; and a polarization multiplexer polarization-multiplexing the first transmitting light beam and the second transmitting light beam in the state where their polarizations are made to be orthogonal to each other and outputting a polarization multiplexed transmitting light beam, wherein the optical phase difference adding unit comprises a frequency deviation adding unit making a frequency deviation arise between the first transmitting light beam and the second transmitting light beam.