Alcatel

Hélène Biscaras

Carlos Luis De Barros

Lionel Provost

Christine Moreau

An optical waveguide suitable for a slanted Bragg grating (SBG) to be written thereinto has a refractive index profile defining a core and a cladding and a specific photosensitivity profile. This photosensitivity profile W(r) is such that, for a given SBG writing angle &#x3b8;, the coupling of the fundamental mode into itself as counterpropagation in the waveguide, K(&#x3b8;), is substantially zero and such that its derivative K'(&#x3b8;) with respect to the angle &#x3b8; is also substantially equal to zero. The zero derivative, and also the zero coupling of the fundamental mode as a function of the angle, means that a widened reflection pocket about the grating write angle is guaranteed.

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Voisins Le Bretonneux, France

Hélène Biscaras