Back to results
US 2009/0021238 A1Published application
Optical device and method of controlling the same
AssigneeEudyna Devices Inc.
InventorsTsutomu ISHIKAWA, Toyotoshi MACHIDA, Hirokazu TANAKA
Life of this patent
Estimating the term…
Abstract
An optical device includes an optical element, a detector and a controller. The optical element has an optical waveguide. Refractive index of the optical waveguide is controlled by a heater. A temperature of the optical element is controlled by a temperature control device. The detector detects a current flowing in the heater and/or a voltage applied to the heater. The controller controls an electrical power provided to the heater so as to be kept constant according to the detection result of the detector.
Claims18
An optical device comprising:
- an optical element that has an optical waveguide, refractive index of the optical waveguide being controlled by a heater, and a temperature of the optical element being controlled by a temperature control device;
- a detector that detects a current flowing in the heater and/or a voltage applied to the heater;
- and
- a controller that controls an electrical power provided to the heater so as to be kept constant according to the detection result of the detector.
1 more element
A method of controlling an optical device comprising:
- controlling a temperature of an optical semiconductor element with a temperature control device;
- controlling refractive index of the optical semiconductor device with a heater;
- and
- controlling an electrical power provided to the heater so as to be kept constant according to a current flowing in the heater and/or a voltage applied to the heater.
1 more element
Dependencies are inferred from the claim text.