Optical waveguide device and optical modulator
AssigneeFujitsu Limited
InventorsMasaharu Doi, Masaki Sugiyama, Tadao Nakazawa
Life of this patent
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Abstract
An optical waveguide device includes a substrate having an electro-optical effect, an optical waveguide formed on the substrate, an electrode provided for the optical waveguide, a monitoring optical waveguide for guiding part of light outputted from the optical waveguide as monitor light, an attenuation section provided for the monitoring optical waveguide for attenuating the monitor light, and a light detection section for detecting the intensity of the monitor light guided by the monitoring optical waveguide and attenuated by the attenuation section.
Claims23
An optical waveguide device, comprising:
- a substrate having an electro-optical effect;
- a plurality of Mach-Zehnder type or directional coupler type optical waveguides formed in series on said substrate;
- a plurality of electrodes provided independently of each other and individually for said plurality of optical waveguides;
- and
- a plurality of light detection sections for detecting the intensity of light emitted from said plurality of optical waveguides independently of each other.
An optical modulator, comprising:
- a substrate having an electro-optical effect;
- first and second Mach-Zehnder type optical waveguides formed in series on said substrate;
- a first signal electrode provided for said first Mach-Zehnder type optical waveguide for being supplied with a clock signal;
- a second signal electrode provided for said second Mach-Zehnder type optical waveguide for being supplied with a data signal;
- a first bias electrode provided for said first Mach-Zehnder type optical waveguide for applying a bias voltage;
- a second bias electrode provided for said second Mach-Zehnder type optical waveguide for applying the bias voltage;
- a first monitoring photo-detector for detecting the intensity of light outputted from said Mach-Zehnder type optical waveguide;
- and
- a second monitoring photo-detector for detecting the intensity of light outputted from said second Mach-Zehnder type optical waveguide.
An optical waveguide device, comprising:
- a substrate having an electro-optical effect;
- an optical waveguide formed on said substrate;
- an electrode provided for said optical waveguide;
- a monitoring optical waveguide for guiding part of light outputted from said optical waveguide as monitor light;
- an attenuation section provided for said monitoring optical waveguide for attenuating the monitor light;
- and
- a light detection section for detecting the intensity of the monitor light guided by said monitoring optical waveguide and attenuated by said attenuation section.
An optical waveguide device, comprising:
- a substrate having an electro-optical effect;
- a plurality of Mach-Zehnder type or directional coupler type optical waveguides formed in series on said substrate;
- a plurality of electrodes provided independently of each other and individually for said plurality of optical waveguides;
- a plurality of light detection sections for detecting the intensity of light emitted from said plurality of optical waveguides independently of each other;
- and
- a bias control section for controlling, based on the intensity of the light detected by one of said plurality of light detection section, a bias voltage to be applied to one of said electrodes provided for that one of said optical waveguides which corresponds to the one light detection section.
Dependencies are inferred from the claim text.