Closed-loop control of tunable optical wavelength filters
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United States of America Patent
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Apr 27, 2004
Grant Date -
Dec 4, 2003
app pub date -
May 30, 2002
filing date -
May 30, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A wavelength selective optical device for locking to a selected wavelength in an ITU grid includes a first waveguide, a second waveguide, a heating element and a control unit. The first waveguide includes a tunable filter formed in the first waveguide and the second waveguide includes a reference filter formed in the second waveguide. The heating element is in thermal contact with the tunable filter and the reference filter and the control unit is coupled to the heating element and the reference filter. The control unit varies a temperature of the heating element responsive to an indication signal provided by the reference filter to adjust the selected channel of the tunable filter.
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