Optical filter and method of making the same

Abstract

The present invention relates to an optical filter having a plurality of long-period gratings, and a method of making the same. The optical filter according to the present invention comprises a plurality of long-period gratings having attenuation peaks different from each other in a core region thereof, whereas the order of cladding mode in the light attenuated by the plurality of long-period gratings to couple with the core mode thereof varies among these long-period gratings.

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