Temperature-independent optical wavelength identification apparatus and optical wavelength identification method
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United States of America Patent
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Feb 3, 2009
Grant Date -
Dec 27, 2007
app pub date -
Apr 9, 2007
filing date -
Jun 21, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The distance between an optical diffraction device and a focusing lens, and the coefficient of the focal length change of the focusing lens, are adjusted based on the calculation expression of wavelength identification errors in light of temperature change of a member making up light receiving means (e.g., PD array), thereby performing correction of wavelength identification errors, whereby optical wavelength identification can be performed with high precision even when the temperature changes.
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