Abstract
We propose a tunable flat-top bandpass filter to pass light in a customized
wavelength band by using long-period fiber gratings (LPFG) structure. The LPFG
structure is composed of a core mode blocker in between two LPFGs. The bandpass
spectrum of the proposed structure is obtained in overlapped wavelength band of two
LPFGs operating on the same modes. To analyze the properties, we introduce a
mathematical matrix model for the structure. We theoretically demonstrate
flexibility of the flat-top bandpass filter with various bandwidths.
© 2011 Optical Society of Korea
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