Laser wavelength stabilization
OwnerShengzhong Zhang, Near Margalit +1inventors
InventorsShengzhong Zhang, Near Margalit, Mohammad Azadeh
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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° C. to about 85° 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.
Claims5
A method of operating a CWDM laser device comprising:
- heating said CWDM laser over a first temperature range;
- and
- operating said CWDM laser device without temperature control over a second operating temperature range so as to maintain said operating CWDM laser device within said second temperature range and thereby stabilizing an output wavelength of said CWDM laser device.
Dependencies are inferred from the claim text.