Differential drive semiconductor optical modulator
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsTatsuo Hatta, Norio Okada
Life of this patent
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Abstract
A differential drive semiconductor optical modulator includes: a differential driver circuit having output pads which can output a pair of differential signals; a transmission-line substrate having transmission lines connected to the output pads and ground lines; and semiconductor modulators mounted on the transmission-line substrate, arranged in series along a common optical axis; terminal resistors connected to terminal ends of the transmission lines and inductances interposed between the semiconductor modulators and the terminal resistors, on the transmission-line substrate, producing an appropriate optical modulation waveform with a high extinction ratio and enhanced modulation bandwidth.
Claims10
A differential drive semiconductor optical modulator comprising:
- a differential driver circuit having first and second output terminals which can output a pair of differential signals;
- a transmission-line substrate having a first transmission line connected to the first output terminal, a second transmission line connected to the second output terminal, and a ground line;
- a first semiconductor modulator connected between the first transmission line and the ground line, mounted on the transmission-line substrate;
- a second semiconductor modulator connected between the second transmission line and the ground line, mounted on the transmission-line substrate, the first and second semiconductor modulators being arranged in series along a common optical axis;
- and
- a first terminal resistor connected between a terminal end of the first transmission line and the ground line, a second terminal resistor connected between a terminal end of the second transmission line and the ground line, a first inductance interposed between the first semiconductor modulator and the first terminal resistor, and a second inductance interposed between the second semiconductor modulator and the second terminal resistor, located on the transmission-line substrate.
Dependencies are inferred from the claim text.