Effect of third-order dispersion on subpicosecond pulse propagation in photonic-crystal waveguides

We have experimentally investigated the effects of dispersion on subpicosecond pulse propagation over two-dimensional (2D) photonic-crystal-slab line-defect waveguides by time domain measurements. Using a heterodyne detection technique, pulse shapes after propagating along the waveguide were recorde...

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Bibliographic Details
Published in:Applied physics letters 2006-09, Vol.89 (13)
Main Authors: Tanaka, Yu, Kuwatsuka, Haruhiko, Kawashima, Hitoshi, Ikeda, Naoki, Sugimoto, Yoshimasa, Hasama, Toshifumi, Ishikawa, Hiroshi
Format: Article
Language:English
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Summary:We have experimentally investigated the effects of dispersion on subpicosecond pulse propagation over two-dimensional (2D) photonic-crystal-slab line-defect waveguides by time domain measurements. Using a heterodyne detection technique, pulse shapes after propagating along the waveguide were recorded as cross-correlated traces. When the pulse central frequency approached the band edge of the guided mode, the pulses were temporally delayed and their shapes were found to be broadened asymmetrically; this effect originated from the group velocity dispersion (GVD), encompassing higher-order dispersion effects. Theoretical pulse shapes, including third-order dispersion (TOD), agreed well with the experimental results. When the group velocity (vg) reached 0.08c, c being the speed of light, we found a GVD of ∼5.0ps2∕mm and a TOD of ∼0.3ps3∕mm. Experimentally obtained vg, GVD, and TOD characteristics agreed well with those obtained from 2D plane-wave-expansion band calculations.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2357152