Planar optical waveguide, planar optical waveguide with Bragg gr

Details Planar optical waveguide, planar optical waveguide with Bragg gr Planar optical waveguide, planar optical waveguide with Bragg gr

1997-11-19

1999-08-17

Healy, Brian

Optical waveguides

Planar optical waveguide

385 14, 385 37, 385130, 385131, 385141, G02B 610

Patent

active

059405686

ABSTRACT:
It is known to expose a photosensitive waveguide core to an optical interference pattern which is produced using a phase mask. Precise positioning of the phase mask above the optical waveguide is difficult if several Bragg gratings are to be produced in a confined space. The invention solves the problem of how to produce virtually arbitrarily defined refractive-index gratings in a core of an optical waveguide with high precision without the use of phase masks. To accomplish this, a buffer layer of the optical waveguide, preferably the cladding layer (CLA), is patterned in such a way that UV laser light directed to the waveguide forms an optical interference pattern in the core (COR), thereby imprinting a Bragg grating. The pattern (GST) in the buffer layer is preferably formed by etching.

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"Silica-based integrated optical components for telecommunications applications", Optical Engineering, vol. 32, No. 5 (1983), pp. 1011-1014.
"Planar waveguide Mach-Zender bandpass filter fabricated with single exposure UV-induced gratings", OFC '96 Technical Digest, p. 277 by G.E. Kohnke et al.

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