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An optical device is provided by a pigtailing method and comprises a Substrate on which are integrated a layered optical waveguide component and optical fibre ends. The optical fibre ends are positioned in grooves). The method involves providing a Substrate comprising grooves, notably V-shaped grooves, with a separately made optical waveguide component. The component is made on a sepa rate flat Substrate and released by Virtue of a releasable layer present on the flat Substrate. An advantageous releasable layer is made of a water-soluble salt. Flexible waveguide sheets Such as can be used in the previously described method or, if provided with waveguide channels, as flexible waveguide components themselves are also disclosed.