Lucent Technologies Inc.

Agere Systems Guardian Corp.

Ashish Ahuja

Benjamin John Eggleton

Paul S Westbrook

John A Rogers

Arturo Hale

Jon W Engelberth

Steven Herbert Simon

Glen Robert Kowach

Sharad Ramanathan

Torben N Nielson

In accordance with the invention, an optical waveguide grating with an adjustable optical spacing profile comprises a waveguide grating in thermal contact with one or more resistive film coatings. A coating extends along the length of the grating and its local resistance varies along the length of the grating. In one embodiment, a plurality of overlaping coatings are chosen so the resistance variation of each is different, thereby permitting a variety of heat generation profiles to be effected by independent control of the coatings. The different heat generation profiles, in turn, proportionately change the grating geometric spacing and local refractive index along the grating length, providing the desired adjustable optical spacing profile. Other embodiments use resistive films with abruptly changing or periodically changing heating variation.

Optical waveguide gratings device with adjustable optical space profile

In accordance with the invention, an optical waveguide comprising a longitudinally extending core housing an optical grating and a cladding layer peripherally surrounding the core, is provided with an outer surface of the cladding layer having one or more perturbations. Each perturbation has a height with respect to the core that varies by at least 0.1 times a Bragg wavelength of the grating over the surface of the perturbation and covers an extent of the outer surface whose linear dimensions are less than 1 cm. The perturbations suppress cladding mode spectra and reduce short wavelength cladding mode loss.

Optical waveguide gratings having roughened cladding for reduced short wavelength cladding mode loss

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Paramus, NJ, United States of America

Ashish Ahuja