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Proceedings Paper

NOLM-based all-optical 40 Gbit/s format conversion through sum-frequency generation (SFG) in a PPLN waveguide
Author(s): Jian Wang; Junqiang Sun
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Paper Abstract

A novel all-optical format conversion scheme from NRZ to RZ based on sum-frequency generation (SFG) in a periodically poled LiNbO3 (PPLN) waveguide is proposed, using a nonlinear optical loop mirror (NOLM). The conversion mechanism relies on the combination of attenuation and nonlinear phase shift induced on the clockwise signal field during the SFG process. The SFG between pump, and co- and counter- propagating signals in the PPLN waveguide are numerically studied, showing that counter-propagating SFG can be ignored when quasi-phase matching (QPM) for SFG during co-propagating interaction. The nonlinear phase shift induced on the clockwise signal field is analyzed in detail, showing that it is more effective to yield large values for nonlinear phase shift when appropriately phase mismatched for the SFG process. Two tuning schemes are proposed depend on whether the sum-frequency wavelength is variable or fixed. It is found that the latter has a rather wide 3dB signal conversion bandwidth approximately 154nm. Finally, the influence of reversible process of SFG is discussed and the optimum arrangement of pump and signal peak powers is theoretically demonstrated. The result shows that proper power arrangement, pump width, and waveguide length are necessary for achieving a good conversion effect.

Paper Details

Date Published: 9 December 2005
PDF: 10 pages
Proc. SPIE 6021, Optical Transmission, Switching, and Subsystems III, 60212H (9 December 2005); doi: 10.1117/12.633439
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. 6021:
Optical Transmission, Switching, and Subsystems III
Rodney S. Tucker; Dominique Chiaroni; Wanyi Gu; Ken-ichi Kitayama, Editor(s)

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