Detecting aging of optical components
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United States of America Patent
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Feb 11, 2003
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N/A
app pub date -
Jun 22, 2000
filing date -
Jun 22, 2000
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Abstract
The invention in accordance with one aspect is a method of determining aging of a light emitting device which is capable of selectively emitting light having different wavelengths corresponding to different channels for light transmission as a function of tuning current supplied to the device. A tuning current is applied to the device which results in a wavelength corresponding to a desired channel. The slope of a curve which is light power from the device as a function of tuning current is determined by dithering about the applied tuning current. The determined slope is compared with a prior determined value in order to detect any change from the prior value. The voltage derived from a light signal passing through an optical filter can also be measured and compared to a prior value. These values may be used to determine aging of the device and the filter.
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