Coherent light generators – Particular component circuitry – Having feedback circuitry
Reexamination Certificate
2005-11-15
2005-11-15
Harvey, Minsun Oh (Department: 2828)
Coherent light generators
Particular component circuitry
Having feedback circuitry
C372S033000
Reexamination Certificate
active
06965622
ABSTRACT:
The present invention is directed toward a laser wavelength locking scheme suitable for incorporation into WDM systems having channel spacings of 25 GHz or less. In a preferred embodiment, light output from the laser is supplied to a filtering element, such as an in-fiber Bragg grating or an etalon, and photodetectors are used to sense light transmitted through and either reflected by the filtering element or input to the filtering element. A measured ratio corresponding to a quotient of the photocurrents generated by the photodetectors is calculated and compared to a desired ratio corresponding to a measured temperature of the filtering element when the filtering element transmits the desired wavelength to be locked. Based on the comparison of the desired and measured ratios, a temperature error value is calculated which is used to adjust the laser temperature, as well as the laser wavelength. Accordingly, the temperature of the filtering element, for example, influences the laser temperature, so that wavelength variations stemming from temperature induced changes in the filtering element and other components in the laser package can be compensated, and the output wavelength can remain substantially fixed.
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Cho Si Hyung
Davis Larry
Lyubomirsky Ilya
McAdoo Gerald
Nichols Doyle
Cammarata Michael R.
Ciena Corporation
Harvey Minsun Oh
Nguyen Tuan N.
Soltz David L.
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