Athermalization and pressure desensitization of diffraction...

Details Athermalization and pressure desensitization of diffraction... Athermalization and pressure desensitization of diffraction...

H - Electricity

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H04J 14/02 (2006.01) G01J 3/02 (2006.01) G01J 3/14 (2006.01) G01J 3/18 (2006.01) G01J 3/28 (2006.01) G02B 5/18 (2006.01) G02B 6/00 (2006.01) G02B 6/293 (2006.01) G02B 6/34 (2006.01) G02B 7/00 (2006.01) G02B 7/02 (2006.01) G02B 27/10 (2006.01) H04B 10/08 (2006.01) H04B 10/213 (2006.01)

Patent

CA 2413977

A wavelength division multiplexer/demultiplexer (WDM) for use in an optical network and in an optical performance monitor that minimizes increases in insertion losses over temperature variations. The WDM has a structure for holding at least one optical component. A diffraction grating assembly having a substrate is held in relation to the at least one optical component by the structure. A lens assembly having a focal length is held in relation to the at least one optical component. The coefficient of thermal expansion of the lens assembly and structure are approximately equal. The lens assembly is constructed from a material chosen to minimize its variance in focal length over temperature. The grating assembly has an angular dispersion that changes with temperature and the product of the focal length and angular dispersion remains constant over temperature. The WDM further comprises a prism having a change in index of refraction with temperature that is approximately equal to a negative of a coefficent of thermal expansion of the substrate. The substrate has a coefficient of thermal expansion approximately equal to a negative of a coefficient of thermal expansion of air.

L'invention concerne un multiplexeur/démultiplexeur par répartition en longueur d'ondes (WDM) à utiliser dans un réseau optique et dans un moniteur de performance optique qui limite des augmentations de pertes d'insertion lors de variations thermiques. Le WDM possède une structure servant à maintenir au moins un composant optique. Un ensemble réseau de diffraction doté d'un substrat est supporté par la structure par rapport au composant optique. Un ensemble lentille comportant une longueur focale est supporté par rapport au composant optique. Le coefficient de la dilatation thermique de l'ensemble lentille et de la structure est approximativement le même. L'ensemble lentille est constitué d'un matériau choisi pour réduire ses variations de longueur focale lors des variations thermiques. L'ensemble réseau comporte une dispersion angulaire qui change en fonction de la température. Le produit de la longueur focale et de la dispersion angulaire demeure stable lors des variations thermiques. Le WDM comprend également un prisme doté d'un changement d'indice de réfraction, avec une température approximativement égale à une valeur négative d'un coefficient de dilatation thermique du substrat. Ce dernier possède un coefficient de dilatation thermique approximativement égal à une valeur négative d'un coefficient de dilatation thermique de l'air.

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