Laser wavelength stabilization
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United States of America Patent
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Issued Date -
Oct 9, 2008
app pub date -
Jan 18, 2008
filing date -
Jul 18, 2006
priority date (Note) -
Abandoned
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Abstract
In a coarse wavelength division multiplexing (CWDM) optical transmission system, a distributed feedback (DFB) laser is tuned so that the peak reflection of the grating overlaps with the gain range of the DFB laser. The diffraction grating is tuned so that the peak is positioned on the long wavelength end of the gain spectrum at a selected temperature. The optical transmission system operates in an environment having a wide temperature range (i.e., about -40.degree. C. to about 85.degree. C.). Heat is applied to the laser and as the laser temperature increases, the gain range overtakes the grating peak. When the gain range and the grating peak overlap at increased laser temperature, laser output is improved.
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