Patent ID: 8306434

Claim:
A signal-transmitting system, comprising: a digital-to-analog converter configured to convert digital data into an electrical analog signal; an optical modulator including a first optical waveguide configured to transmit a first optical carrier, a second optical waveguide configured to transmit a second optical carrier, a first electrode positioned on the first optical waveguide, and a second electrode positioned on the second optical waveguide; a first electrical coupler configured to couple the electrical analog signal and a first electrical carrier to the first electrode to generate a first modulation wave; a second electrical coupler configured to couple the electrical analog signal and a second electrical carrier to the second electrode to generate a second modulation wave, the phase of the first electrical carrier being different from the phase of the second electrical carrier by a predetermined phase difference; an optical phase shifter configured to shift the second modulation wave by a predetermined phase; an optical coupler configured to couple the first modulation wave and the second modulation wave to generate an optical output signal; and an electrical phase shifter modulating the second modulation wave modulated by the optical phase shifter such that a left sideband of the first modulation wave and a left sideband of the second modulation wave have the opposite phase and eliminate each other due to the destructive interference.