Optical modulator and an optical modulating method

Details Optical modulator and an optical modulating method Optical modulator and an optical modulating method

1998-03-30

1999-11-30

Sugarman, Scott J.

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

385 2, 359183, 359279, G02F 1035

Patent

active

059956852

ABSTRACT:
An optical modulator suitable for use in, for example, a terminal apparatus in an optical communication system when an optical signal is modulated has a power splitting unit for splitting a power of an incident light into two split lights, a first intensity modulating unit for performing an intensity modulation on one of the split lights split by the power splitting unit and outputting an intensity-modulated optical signal containing a direct current component, an optical phase shifting unit for performing a phase shift on the other of the split lights split by the power splitting unit such that the light has a phase opposite to that of the intensity-modulated optical signal, and a direct current component suppressing unit for making the intensity-modulated optical signal and the light subjected to the phase shift interfere with each other to suppress the direct current component contained in the intensity-modulated optical signal and outputting the intensity-modulated optical signal, thereby obtaining the modulated optical signal with a high extinction ratio although being driven at a low voltage.

REFERENCES:
patent: 5101450 (1992-03-01), Olshansky
patent: 5161206 (1992-11-01), Djupsjobacka
patent: 5278923 (1994-01-01), Nazarathy et al.
patent: 5408544 (1995-04-01), Seino
patent: 5699179 (1997-12-01), Gopalakrishnan

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