Pirelli Cavi E Sistemi S.p.a.

Pirelli Cavi & Sistemi S.p.a.

Martin Cole

Richard Ian Laming

Laurence Reekie

A method of fabricating an optical waveguide grating having a plurality of grating lines of refractive index variation comprises the steps of: (i) repeatedly exposing a spatially periodic writing pattern onto a photosensitive optical waveguide: and (ii) moving the writing light pattern and/or the waveguide between successive exposures of the writing light pattern, so that each of at least a majority of the grating lines is generated by at least two exposures to different respective regions of the writing light pattern.

Fabricating optical waveguide gratings

Method of fabricating an optical waveguide grating having a plurality of grating lines of refractive index variation including (i) repeatedly exposing a spatially periodic writing light pattern onto a photosensitive optical waveguide; and (ii) moving at least one of the writing light pattern and the waveguide between successive exposures of the writing light pattern, so that each of at least a majority of the grating lines is generated by at least two exposures to different respective regions of the writing pattern.

A method of forming a chirped fiber grating having the steps of providing an optical fiber, impressing a non-linear grating onto a portion of the optical fiber to define a non-linear variation in the refractive index. The method further comprising applying a temperature gradient to a portion of the optical fiber to provide a variation that acts against the non-linear variation in the refractive index.

Dispersion compensation optical fibre transmission

An optical fiber transmission system comprises an optical signal source operable to generate an optical signal at a predetermined bit rate and at a signal wavelength; an optical fiber transmission link connected at a first end to the signal source, the link having dispersion characteristics at the signal wavelength; an optical amplifier serially disposed in the link; and a signal receiver connected at the second end of the Lank; in which a grating is connected in the link, the grating being chirped by an amount providing at least partial compensation of the dispersion characteristics of the link, the compensation such as to provide a signal, at the second of the link, compatible with the sensitivity requirements of the receiver at the second end of the link.

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Delray Beach, FL, United States of America

Martin Cole