Athermalization and pressure desensitization of diffraction...

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

H - Electricity

04

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H04J 14/00 (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 6/34 (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) H04J 14/02 (2006.01)

Patent

CA 2410940

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 coefficient 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 en longueur d'onde (WDM) utilisé dans un réseau optique et dans un moniteur de performances optiques réduisant les pertes d'insertion liées aux variations de température. Le WDM comprend une structure servant de support à un composant optique au moins. Un réseau de diffraction doté d'un substrat est maintenu en relation avec ce composant optique par ladite structure. Une lentille comprenant une longueur focale est également maintenue en relation avec ledit composant optique. Les coefficients de dilatation thermique de la lentille et de la structure sont approximativement égaux. Ladite lentille est fabriquée à partir d'un matériau permettant de réduire sa variance de longueur focale en fonction de la température. Le réseau présente une dispersion angulaire variant selon la température, le produit de la longueur focale et de la dispersion angulaire demeurant constant quelle que soit la température. Ce WDM comprend également un prisme présentant un changement d'indice de réfraction selon la température, ce changement correspondant approximativement à une valeur négative d'un coefficient de dilatation thermique du substrat, lequel présente un coefficient de dilatation thermique approximativement égal à une valeur négative d'un coefficient de dilatation thermique de l'air.

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