Acme Grating Ventures, LLC

Jds Uniphase Pty Limited

Timothy E Hammon

Thomas J Cullen

John M Stockhausen

Jonathan Mark Bulman

Thomas David Stephens

Apparatuses, systems, and methods are disclosed for providing optical communications. Bragg grating used in the optical components and systems of the present invention are produced by selectively hydrogenating one or more selected sections of an optical waveguide in general, and particularly optical fiber. Selective hydrogenation can be performed by selectively establishing local conditions in a first environment conducive to introducing greater quantities of hydrogen into selected sections than into non-selected sections, which are maintained in a second environment. The extent of selective hydrogenation and the hydrogen concentration difference between selected and non-selected section of the waveguide is a function of the temperature, pressure, and time of exposure established in the first and second environments.

Optical transmission systems and apparatuses including bragg gratings and methods of making

A method of writing a Bragg grating in a photosensitive optical waveguide ( ) is disclosed comprising utilizing a single coherent beam of light ( ) and a diffraction grating ( ) to create two coherent working beams ( ) of light; positioning a plurality of reflective elements ( ) on each side of said waveguide; propagating the two working beams around said plurality of reflective elements, each of the beams being reflected by each of the reflective elements, so that the beams interfere at an initial predetermined position ( ); and rotating at least one of the reflective elements on each side of the waveguide to simultaneously independently control the period of the interference pattern and position of the interference pattern in accordance with predetermined requirements so as to produce the grating structure in the photosensitive waveguide.

Method and apparatus for writing gratings

The invention provides a method of forming a grating structure on a photosensitive waveguide, involving: moving the waveguide relative to a light source in the longitudinal direction of the grating, directing coherent light from the light source perpendicularly to the direction of relative movement of the waveguide and irradiating spaced-apart regions of the waveguide to form the grating structure, modulating the light and, as a separate step, passing the light through a shutter in its passage between the light source and the waveguide, and controlling the shutter to effect shuttering of the light in synchronisation with the relative movement of the waveguide during formation of the grating structure, in order to control the irradiation of said waveguide so as to keep constant the refractive index in the waveguide core averaged over a full period of said grating structure.

Grating writing method and apparatus

Optical transmission systems and apparatuses including Bragg gratings and methods of making

Optical transmission systems and apparatuses including Bragg gratings

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Silver Spring, MD, United States of America

Timothy E Hammon