Abstract
We propose a flat-top bandpass Solc-type filter in a periodically poled lithium niobate crystal. Our study reveals several critical electric fields at which the transmission spectrum surprisingly evolves into a flat-top one, which is a new method for obtaining a flat-top wavelength filter. Because the flat-top passband width can be controlled by the applied electric field, it shows a potential application in optical networks and ultrafast optical signal processing.
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