Optical waveguides – Planar optical waveguide – Thin film optical waveguide
Patent
1992-11-16
1993-11-02
Ullah, Akm E.
Optical waveguides
Planar optical waveguide
Thin film optical waveguide
G02B 600
Patent
active
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:
patent: 4266850 (1981-05-01), Burns
patent: 5059763 (1991-10-01), O'Brien et al.
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.
Bulmer Catherine H.
Burns William K.
Greenblatt Arthur S.
McDonnell Thomas E.
Stockstill Charles J.
The United States of America as represented by the Secretary of
Ullah Akm E.
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