Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2007-06-12
2007-06-12
Tran, Dzung (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S087000, C398S090000
Reexamination Certificate
active
10279398
ABSTRACT:
A temperature sensing and control method and apparatus. In one aspect of the present invention, an apparatus according to the teachings of the present invention includes an optical path disposed in semiconductor material. A four-terminal resistor is defined in the semiconductor material. At least a portion of the optical path is directed through the four-terminal resistor. The four-terminal resistor includes a first pair of terminals between which a probe current is to be injected. The four-terminal resistor also includes a second pair of terminals between which a voltage drop is to be measured so as to determine a resistance along the portion of the optical path directed through the four-terminal resistor. Temperature may be derived from the determined resistance of the four-terminal resistor. In one embodiment, the temperature of the semiconductor material may then be controlled with a heater in response to the derived temperature.
REFERENCES:
patent: 5987200 (1999-11-01), Fleming et al.
patent: 6044190 (2000-03-01), Kashyap
patent: 6778734 (2004-08-01), Baldwin et al.
Alduino Andrew C.
Frost Christina A.
Samara-Rubio Dean A.
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