Optical modulator

Details Optical modulator Optical modulator

2007-08-28

2007-08-28

Font, Frank G. (Department: 2883)

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

C385S004000, C385S008000, C385S014000

Reexamination Certificate

active

11320699

ABSTRACT:
An optical modulator of the invention includes a substrate having an optical waveguide and an electric waveguide formed therein, a driving circuit that generates a modulation electric signal, a relay circuit that gives the modulation electric signal to the electric waveguide via an electric filter circuit made of a capacitor and a resistor, and a terminal resistor that terminates the modulation electric signal that has propagated through the electric waveguide. The sum of the impedance of the electric filter circuit and the resistance of the terminal resistor is set to be substantially equal to the impedance of the driving circuit. Also, the resistance of the terminal resistor is set to be substantially equal to the characteristic impedance of the electric waveguide. Then, deterioration of the electric reflection characteristic in a low-frequency region can be restrained even if the frequency characteristic of the optical response is flattened and leveled by application of the electric filter circuit.

REFERENCES:
patent: 6647158 (2003-11-01), Betts et al.
patent: 6674927 (2004-01-01), Ibukuro
patent: 6934448 (2005-08-01), Akashi et al.
patent: 2003/0138179 (2003-07-01), Akiyama et al.
patent: 2002-287103 (2002-10-01), None

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