| 摘要 |
A CWDM filter of the present invention comprises a substrate; a first portion formed on the substrate having at least two first stacking structures; a second portion superposed on the first portion including at least two second stacking structures; and a first matching layer sandwiched between the first and second portions. Each of the first stacking structures of the first portion has a Fabry-Perot cavity and a first coupling layer which are stacked over each other in turn from the substrate. Each second stacking structure has a (HnLH) structure and a second coupling layer, wherein n represents a positive integer greater than 1, L represents a low index layer with a thickness of lambda<SUB>o</SUB>/4, H represents a high index layer with a thickness of lambda<SUB>o</SUB>/4, and lambda<SUB>o </SUB>is the center wavelength of said noise.
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