Adjustable dispersion compensator with few mode fibers and...

H - Electricity – 04 – B

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H04B 10/18 (2006.01) G02B 6/14 (2006.01) G02B 6/34 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2437877

The specification describes dispersion compensators that are adjustable based on selection of mode propagation properties of two or more modes. The fundamental device structure comprises two or more sections of optical fiber that support the fundamental mode as well as well as one or more higher-order-modes (HOM). The HOM fibers are connected to each other by means of a spatial mode-converter (MC) that is switchable. The MC may be fabricated with, for example, long-period fiber-gratings (LPG), coupled waveguide devices, free-space phase-retardation elements, micro-electro-mechanical devices, or acousto-optic couplers. The MC is assembled such that it transforms any incoming spatial mode into one of any other guided modes in the HOM fiber. Switching is achieved by strain, temperature, the electro-optic or nonlinear optic effect, or any other physical effect that changes the refractive index of the optical material used to construct the MC.

La présente invention concerne des compensateurs de dispersion qui sont réglables en fonction de la sélection des propriétés du mode de propagation de deux modes ou plus. La structure fondamentale du dispositif comprend deux ou plusieurs sections de fibre optique qui supporte le mode fondamental, de même qu'un ou plusieurs modes d'ordre supérieur (HOM). Les fibres HOM sont reliées entre elles au moyen d'un transformateur de mode spatial (MC) qui peut commuter. Par exemple, le transformateur MC peut être fabriqué de réseaux de fibres de longue durée (LPG), de dispositifs de guidage d'ondes accouplés, d'élément de retardement de phase dans l'espace, de dispositifs micro-électro-mécaniques ou de coupleurs acousto-optiques. Le transformateur MC est assemblé de telle sorte qu'il transforme un mode spatial d'entrée en un ou plusieurs modes guidés dans la fibre HOM. La commutation est obtenue par la contrainte, la température, l'effet électro-optique ou optique non linéaire, ou par tout autre effet physique qui modifie l'index de réfraction du matériau optique utilisé pour fabriquer le transformateur MC.

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