Patent
1986-12-22
1988-12-06
Lee, John D.
350 9611, G02B 612
Patent
active
047892129
ABSTRACT:
An optical polarizer is described in which a propagation layer, i.e., a titanium diffused light guiding region in a lithium niobate Z-cut crystal, is covered with a dielectric buffer layer of ZnO. The dielectric buffer layer is covered by a meal layer, typically aluminum, although gold or silver can be used. The thickness of the buffer is chosen so as to increase the attenuation of TM modes of radiation in the waveguide relative to TE modes. The buffer layer thickness can fall within a broad range and is not required to fall within a very precise range to achieve a peak level of attenuation.
REFERENCES:
Hickernell, "Low Loss Zinc Oxide Optical Waveguides on Amorphous Substrates", Conference: Integrated and Guided-Wave Optics Technical Digest; Incline Village, N.Y., U.S.A., 128-30, Jan. 1980); pp. WB6-1-WB6-4.
Masuda et al.; "An Optical Waveguide Mode Spliter In-Ti-Diffused LiNbO.sub.3 "; Sixth European Conference on Optical Communication, York, England; (16-19 Sep. 1980), pp. 264-268.
Bristow et al.; "Novel Integrated Optical Polarisers Using Surface Plasma Waves and Ion Milled Grooves in Lithium Niobate"; Electronics Letters 6th Dec. 1984, vol. 20, No. 25/26; pp. 1047-1048.
Bristow Julian P. G.
Keur Michael
Lukas Gregory J.
Sriram Sriram
Wey Albert C.
Amphenol Corporation
Lee John D.
Ngo John
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