Lensed cascaded optical filter

Details Lensed cascaded optical filter Lensed cascaded optical filter

G - Physics

02

B

G02B 5/28 (2006.01) G02B 6/26 (2006.01) G02B 6/28 (2006.01) G02B 6/32 (2006.01) G02B 6/34 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2235850

A multi-pass optical filter using two identical filters provides narrower band filtering by double filtering an optical signal passing therethrough. Although passing a beam of light at an optical filter having a substantially thick optical thickness is known to have significant coupling losses due to angular misalignment of the output beam and the receiving optical fibre, it has been found that twice filtering in the conventional manner by serially coupling two same filters increases coupling losses. However, this invention provides a coupling arrangement wherein losses are significantly lessened by offsetting the axes of the lensed filters such that the beam exiting the first filter couples into the second filter as it would be reflected backward into the first filter.

Filtre optique multipasse utilisant deux filtres identiques permettant un filtrage de bande plus étroit en filtrant à deux reprises un signal optique qui le traverse. Même si le passage d'un faisceau de lumière dans un filtre optique ayant une épaisseur optique essentiellement grande présente des affaiblissements de couplage à cause du désalignement angulaire du faisceau de sortie et de la fibre optique, on a observé que le filtrage double de la méthode classique consistant à coupler en série les deux mêmes filtres augmente les affaiblissement de couplage. Cependant, la présente invention fournit un couplage dans lequel les affaiblissements sont diminués de manière significative par le décalage des axes des filtres à lentilles de façon que le faisceau sortant du premier filtre s'accouple au deuxième filtre comme s'il était réfléchi vers l'arrière dans le premier filtre.

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