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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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
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container_issue 13
container_start_page
container_title Applied physics letters
container_volume 89
creator Tanaka, Yu
Kuwatsuka, Haruhiko
Kawashima, Hitoshi
Ikeda, Naoki
Sugimoto, Yoshimasa
Hasama, Toshifumi
Ishikawa, Hiroshi
description 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.
doi_str_mv 10.1063/1.2357152
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title Effect of third-order dispersion on subpicosecond pulse propagation in photonic-crystal waveguides
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