Wideband slow light with low dispersion in lattice-shifted asymmetric photonic crystal waveguides

Yunhu Wu; Guoping Zhang; Lifeng Zhao

doi:10.1117/1.OE.53.9.097108

16 September 2014 Wideband slow light with low dispersion in lattice-shifted asymmetric photonic crystal waveguides

Yunhu Wu, Guoping Zhang, Lifeng Zhao

Author Affiliations +

Optical Engineering, Vol. 53, Issue 9, 097108 (September 2014). https://doi.org/10.1117/1.OE.53.9.097108

Abstract

We propose a different type of asymmetric photonic crystal waveguide to achieve slow light with improved normalized delay-bandwidth product and low group velocity dispersion. The lateral symmetry of the proposed waveguide is broken by periodically shifting the two rows of air holes adjacent to the line defect. Under two simple different procedures of shifting air holes, the group indices of 41, 50, 68, and 114 with bandwidths over 14.9, 11, 7.8, and 4.7 nm, and the group indices of 43, 54, 73, and 124 with bandwidths over 13.9, 10.4, 7.1, and 4.3 nm around 1550 nm are obtained, respectively. Low-dispersion slow light propagation is confirmed by studying the relative temporal pulse-width spreading with the two-dimensional finite-difference time-domain method.

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Yunhu Wu, Guoping Zhang, and Lifeng Zhao "Wideband slow light with low dispersion in lattice-shifted asymmetric photonic crystal waveguides," Optical Engineering 53(9), 097108 (16 September 2014). https://doi.org/10.1117/1.OE.53.9.097108

Published: 16 September 2014

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