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Proceedings Paper

Comparison of wavelength conversions based on cascaded second-harmonic generation/difference-frequency generation under continuous-wave and pulsed pumping
Author(s): Yong Wang; Jorge Fonseca-Campos; Chang-Qing Xu; Shiquan Yang; Evgueni A. Ponomarev; Xiaoyi Bao
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Paper Abstract

The implementation of wavelength conversion around 1.55 μm in quasi-phase-matched (QPM) periodically poled LiNbO3 (PPLN) waveguides is mostly based on the cascaded second-harmonic generation/difference-frequency generation (SHG/DFG) process. As usual, a continuous wave (CW) and a pulsed wave are injected into a PPLN waveguide. Of them, the pulsed wave is regarded as the information carrier, and the CW is taken as the control. To transfer the information of optical codes from one wavelength to another, the codes can be applied to either the signal (CW-pumped scheme) or the pump (pulse-pumped scheme). In this work, the temporal and spectral properties of wavelength conversions during pulse propagation as well as the conversion efficiency in the two pumping schemes were compared experimentally and theoretically under different conditions of input pulse width, pump power and pump central wavelength. In the experiments, we adopted an MgO-doped PPLN waveguide, and a 40-GHz tunable picosecond-pulse source. The conversion characteristics were systematically investigated when the CW and the pulsed wave were alternatively taken as the pump at the quasi-phase-matching wavelength of the device. In the theory, we solved the coupled-mode equations and explained the physical insights for the numerical results and experimental observations. The conversion properties of the two pumping schemes were quantitatively compared. The simulated results agree well with the experimental data, and the obtained results provide some guidelines for the design and application of QPM waveguides in wavelength conversion.

Paper Details

Date Published: 8 September 2006
PDF: 10 pages
Proc. SPIE 6343, Photonics North 2006, 63431M (8 September 2006); doi: 10.1117/12.707762
Show Author Affiliations
Yong Wang, McMaster Univ. (Canada)
Jorge Fonseca-Campos, McMaster Univ. (Canada)
Chang-Qing Xu, McMaster Univ. (Canada)
Shiquan Yang, Univ. of Ottawa (Canada)
Evgueni A. Ponomarev, Univ. of Ottawa (Canada)
Xiaoyi Bao, Univ. of Ottawa (Canada)


Published in SPIE Proceedings Vol. 6343:
Photonics North 2006
Pierre Mathieu, Editor(s)

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