05483613 is referenced by 47 patents and cites 3 patents.

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.

Title
Optical device with substrate and waveguide structure having thermal matching interfaces
Application Number
8/291387
Publication Number
5483613
Application Date
August 16, 1994
Publication Date
January 9, 1996
Inventor
Herman M Presby
Highland Park
NJ, US
Allan J Bruce
Westfield
NJ, US
Agent
John M Harman
Assignee
AT&T
NJ, US
IPC
G02B 6/10
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