Optical device and method of controlling the same

Details Optical device and method of controlling the same Optical device and method of controlling the same

2008-07-17

2010-10-12

Nguyen, Ha Tran T (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With waveguide or long line

C324S084000, C324S637000

Reexamination Certificate

active

07812594

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.

REFERENCES:
patent: 2001/0030786 (2001-10-01), Takahashi et al.
patent: 2004/0046129 (2004-03-01), Hosoi et al.
patent: 1804349 (2007-07-01), None
patent: 8-29813 (1996-02-01), None
patent: 9-92934 (1997-04-01), None
European Search Report dated Nov. 17, 2008, issued in corresponding European Patent Application No. 08104798.7.

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