Fabrication and Phase Tuning of an Optical Waveguide Device.
Patent, filed 27 Sep 91, patented 16 Mar 93,
DEPARTMENT OF THE NAVY WASHINGTON DC
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The manufacture of an optical waveguide device utilizing a fast, accurate method for tuning of the output phase angle of such devices to a desired operating point. Tuning is accomplished by adjusting the accumulated phase along a waveguide arm of the device by removing optical waveguide material using laser ablation. Due to the change in waveguide geometry in the ablated region, the optical phase velocity is changed and thus the optical path length is affected in that section of waveguide, thereby resulting in a change in output phase angle.
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