G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/26 (2006.01) G02B 5/28 (2006.01)
Patent
CA 2246500
A novel design for producing band pass filters with essentially square shapes with little or no ripple in the passband zone. Filters are of the all-dielectric type consist of multiple cavities of band passes. Quarter wave thick layers of low index material separate all of the cavities from each other. Multiple half-waves may be added to the outer cavity quarter-wave stacks in particular. This invention provides the addition of half wave to some of the inner cavity stacks to remove ripple that would otherwise be present. Together, these additional half wave layers added to the outer and inner cavities sharpen the transition from low transmission to high transmission without unduly adding ripple to the high transmission zone.
Nouveau mode de production de filtres passe-bande de forme essentiellement carrée sans ondulation ou presque dans la zone passe-bande. Les filtres, de type entièrement diélectrique, consistent en une multiplicité de cavités de bande passante. Des couches épaisses quart-d'onde en matériau à faible indice séparent toutes les cavités les unes des autres. De multiples couches demi-onde peuvent être ajoutées aux suites quart-d'onde de cavités externes en particulier. L'invention prévoit l'ajout de couches demi-onde à certaines des suites de cavités internes afin de supprimer l'ondulation qui sinon serait présente. Ensemble, ces couches demi-onde ajoutées aux cavités internes et externes rendent plus abrupte la transition du niveau de transmission élevé au niveau de transmission faible sans ajouter indûment d'ondulation dans la zone de transmission de niveau élevé.
Jds Fitel Inc.
Jds Uniphase Inc.
Teitelbaum Neil
LandOfFree
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