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Author Landobasa, Y.M. ♦ Darmawan, S. ♦ Chin, M.-K.
Sponsorship IEEE Lasers and Electro-Optics Society
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©1965
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Microcavities ♦ Lattices ♦ Optical filters ♦ Optical resonators ♦ Optical waveguides ♦ Band pass filters ♦ Photonic band gap ♦ Transmission line matrix methods ♦ Resonator filters ♦ Bandwidth ♦ transfer matrix ♦ Guided waves ♦ integrated optic devices ♦ microresonators ♦ optical filters
Abstract We present a transfer matrix analysis of a two-dimensional (2-D) filter to study its frequency response functions. The (M/spl times/N) array consists of N independent columns of microring resonators side-coupled to two channel bus waveguides, with equal spacing between columns and each column consisting of M coupled resonators. We show that such a general 2-D lattice network of lossless and symmetric resonators can approximate an ideal bandpass filter characterized by a flat-top box-like amplitude response without out-of-band sidelobes, and a linear phase response. The bandwidth is determined by the coupling factor between resonators. The 2-D periodic structure exhibits nonoverlapping photonic bandgaps arising from the complementary transmission properties of the row and column arrays. The row array behaves as a distributed feedback grating giving rise to narrow bandgaps corresponding to the flat reflection passbands of the filter with out-of-band sidelobes. The column array, on the other hand, acts as a high-order coupled-cavities filter with broad bandgaps that overlap with the sidelobe regions, thereby effectively suppressing the sidelobes. The phase response is linear except near the band edges, where enhanced group delay limits the usable bandwidth of the filter to about 80%. The minimum size of the array required is about 3/spl times/10, but is ultimately limited by waveguide loss.
Description Author affiliation :: Photonics Res. Center, Nanyang Technol. Univ., Singapore
ISSN 00189197
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2005-11-01
Publisher Place U.S.A.
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Volume Number 41
Issue Number 11
Size (in Bytes) 759.30 kB
Page Count 9
Starting Page 1410
Ending Page 1418

Source: IEEE Xplore Digital Library