Planar optical waveguide, planar optical waveguide with Bragg grating, and method of fabricating such a planar optical waveguide

Granted: Aug 17, 1999 Filed: Nov 19, 1997

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.