Optical device with substrate and waveguide structure having the

Details Optical device with substrate and waveguide structure having the Optical device with substrate and waveguide structure having the

1994-08-16

1996-01-09

Ullah, Akm E.

Optical waveguides

Planar optical waveguide

G02B 610

Patent

active

054836131

ABSTRACT:
The present invention provides polarization-independent optical devices by reducing or eliminating strain-induced birefrigence associated with prior device structures. In a first embodiment, an optical device is produced comprising a doped silica substrate having a coefficient of thermal expansion between 8.times.10.sup.-7 .degree. C..sup.-1 and 15.times.10.sup.-7 .degree.C..sup.-1. On the doped silica substrate is formed a doped silica waveguiding structure having a coefficient of thermal expansion between 8.times.10.sup.-7 .degree. C..sup.-1 and 15.times.10.sup.-7 .degree. C..sup.-1. Alternatively, the coefficient of thermal expansion of the doped silica substrate is selected to be approximately 90% to 110% of the coefficient of thermal expansion of the doped silica waveguiding structure. In another aspect, the present invention provides an optical device comprising a doped silica substrate having a doping gradient from a lower surface to an upper surface. The doping level at the upper surface has a coefficient of thermal expansion approximating the coefficient of thermal expansion of a doped silica waveguiding structure formed thereon.

REFERENCES:
patent: 4781424 (1988-11-01), Kawachi et al.
patent: 5206925 (1993-04-01), Nakazawa et al.
patent: 5261022 (1993-11-01), Sun et al.
C. H. Henry et al., "Glass Waveguides on Silicon for Hybrid Optical Packaging," Journal of Lightwave Technology, vol. 7, No. 10, pp. 1530-1539 (1989)(No Month).
M. Kawachi, "Silica Waveguides on silicon and their application to integrated-optic components," Optical and Quantum Electronics, vol. 22, pp. 391-416 (1990)(No Month).

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