Method and apparatus for writing photosensitive grating using Ll

Details Method and apparatus for writing photosensitive grating using Ll Method and apparatus for writing photosensitive grating using Ll

1996-01-29

1997-05-13

Healy, Brian

Optical waveguides

With optical coupler

Input/output coupler

385 31, 385 51, 385123, 385147, 65385, 65425, 65441, G02B 634, C03B 37023

Patent

active

056299982

ABSTRACT:
Apparatus for forming a refractive index grating in a waveguide in accordance with the invention includes a waveguide formed from a material that changes its index of refraction when exposed to a beam of optical radiation, a source of coherent optical radiation for forming a beam of radiation, a mirror arranged to intercept a first part of a beam and to reflect the first part of the beam through an angle, and a phase delay plate arranged to intercept a second part of the beam for delaying the second part of the beam propagating through the plate, in which the mirror and the phase delay plate are arranged so that the first part of the beam and the second delayed part of the beam form an interference pattern on the waveguide for changing the index of refraction of the waveguide, in a pattern corresponding to the interference pattern for forming an index grating in the waveguide.

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