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Flat-Topped Spectral Response in a Ladder-Type Interferometric Filter
Seok-Hwan JEONG Shinji MATSUO Yuzo YOSHIKUNI Toru SEGAWA Yoshitaka OHISO Hiroyuki SUZUKI
IEICE TRANSACTIONS on Electronics
Publication Date: 2005/08/01
Print ISSN: 0916-8516
Type of Manuscript: PAPER
optical filters, flattened filter response, waveguide device, multimode interference coupler,
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We propose and demonstrate a novel ladder interferometric filter that exhibits flat-topped spectral response for use in wavelength-division-multiplexing (WDM) based photonic networks. We numerically analyze the flattened spectral response in a ladder-type filter by modifying the transfer matrix of ladder interferometer. Conventional parabolic-shaped and flat-topped-designed ladder interferometric filters are fabricated, and characterized. We demonstrate a flat-topped filter response in the fabricated device. The shape factor, which is defined by the ratio of -1 dB bandwidth to -10 dB bandwidth, is improved from 0.32 to 0.54. The tunability and the increase in filter extinction ratio of the proposed device are also discussed.