10 June 2006 40Gbit/s all-optical tunable format conversion in LiNbO3 waveguides based on cascaded SHG+DFG interactions
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Proceedings Volume 6344, Advanced Laser Technologies 2005; 634407 (2006) https://doi.org/10.1117/12.693588
Event: Advanced Laser Technologies 2005, 2005, Tianjin, China
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.
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Jian Wang, Jian Wang, Junqiang Sun, Junqiang Sun, } "40Gbit/s all-optical tunable format conversion in LiNbO3 waveguides based on cascaded SHG+DFG interactions", Proc. SPIE 6344, Advanced Laser Technologies 2005, 634407 (10 June 2006); doi: 10.1117/12.693588; https://doi.org/10.1117/12.693588

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