Patent ID: 9298024
Filing Date: 2016-03-29
CPC Classification: G02F

Claim Text:
1. A Mach-Zehnder modulator, comprising: an optical branch configured to divide an input optical beam into two optical beams; a pair of arm waveguides, each arm waveguide being made of semiconductor material including at least one of InP and GaAs, the arm waveguides propagating respective optical beams divided by the optical branch; a phase presetter provided in one of the arm waveguides to vary a phase of the optical beam propagating therein by Π; and an optical coupler configured to couple the optical beams output from the respective arm waveguides, wherein the arm waveguides are driven by modulation signals complementary to each other, the arm waveguides shifting the phase of the optical beams between 0 and Π radians in response to the amplitude of the modulation signals, and wherein the arm waveguides have a non-linear characteristic between the phase shift for the optical beam propagating therein and the amplitude of the modulation signals.