Fabrication and phase tuning of an optical waveguide device

Optical waveguides – Planar optical waveguide – Thin film optical waveguide

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G02B 600

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052590615

ABSTRACT:
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.

REFERENCES:
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C. H. Bulmer, Sensitive, Highly Linear Lithium Niobate Interferometers For lectromagnetic Field Sensing, Appl. Phys. Lett. 53(24), 12 Dec. 1988, pp. 2368-2370.
Howerton et al., Effect of Intrinsic Phase Mismatch on Linear Modulator Performance of the 1.times.2 Directional Coupler and Mach-Zehnder Interferometer, J. of Lgtwave Tech. vol. 8, No. 8, Aug. 1990, pp. 1177-1186.
Brannon et al., Excimer Laser Etching of Polyimide, J. Appl. Phys., 58 (5), 1 Sep. 1985, pp. 2036-2043.

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