Optical waveguide device, variable optical attenuator, and...

Details Optical waveguide device, variable optical attenuator, and... Optical waveguide device, variable optical attenuator, and...

2005-08-02

2005-08-02

Healy, Brian M. (Department: 2883)

Optical waveguides

Integrated optical circuit

C385S015000, C385S016000, C385S039000, C385S040000, C385S130000, C385S131000, C385S140000, C356S450000, C356S460000

Reexamination Certificate

active

06925217

ABSTRACT:
An optical waveguide device used as, for example, a variable optical attenuator or an optical switch includes: a substrate; a Mach-Zehnder interferometer that is provided on the substrate and that includes first and second waveguide sections interposed between a pair of branches; a heater that includes a conductive thin-film formed at a position corresponding to the first waveguide section and that, by emitting heat, heats the first waveguide section and thus causes a phase shift in the optical signal propagated in the first waveguide section; and a resistor connected, in series with the heater, to a power supply which supplies power to the heater. The resistor has a temperature coefficient of resistance that is lower than that of the heater. The waveguide device is preferably formed as a device having a silica glass waveguide structure.

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