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Proceedings Paper

40Gbit/s all-optical tunable format conversion in LiNbO3 waveguides based on cascaded SHG+DFG interactions
Author(s): Jian Wang; Junqiang Sun
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Paper Abstract

A novel 40Gbit/s all-optical high-speed format conversion scheme from nonreturn-to-zero (NRZ) format to return-to-zero (RZ) format based on cascaded second-order nonlinear interactions (SHG+DFG) in a periodically poled LiNbO3 (PPLN) waveguide is presented for the first time, using a nonlinear optical loop mirror (NOLM). The conversion mechanism relies on the combination of amplification and nonlinear phase shift induced on the signal field by SHG+DFG. The SHG+DFG between pump, and co- and counter- propagating signals in the PPLN waveguide are studied, showing that counter-propagating SHG+DFG can be ignored when quasi-phase matching (QPM) for SHG+DFG during co-propagating interactions. The conversion with the influence of walk-off effect is numerically simulated, the effect of nonlinear phase shift on broadening the conversion bandwidth is analyzed, and an approximately 90-nm conversion bandwidth is achieved, providing the possibility of realizing a broadband tunable NRZ-to-RZ format conversion.

Paper Details

Date Published: 10 June 2006
PDF: 7 pages
Proc. SPIE 6344, Advanced Laser Technologies 2005, 634407 (10 June 2006); doi: 10.1117/12.693588
Show Author Affiliations
Jian Wang, Huazhong Univ. of Science and Technology (China)
Junqiang Sun, Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 6344:
Advanced Laser Technologies 2005
Ivan A. Shcherbakov; Kexin Xu; Qingyue Wang; Alexander V. Priezzhev; Vladimir I. Pustovoy, Editor(s)

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