Flattop Broadband Wavelength Conversion Based on Cascaded Second-Harmonic Generation and Difference Frequency Generation in Step-Segmented Quasi-Phase Matched Gratings

Abstract:

Bandwidth enhancement and response flattening of wavelength conversion based on single-pass and double-pass cascaded second harmonic generation and difference frequency generation in step-segmented quasi-phase matched (QPM) gratings are investigated. For the same waveguide length, high conversion efficiency, flat response and broad signal bandwidth can be obtained simultaneously by optimizing the poling period of the step-segmented QPM structure. The conversion bandwidths in a 3-cm-long five-step-segmented waveguide are 134 nm for single-pass scheme and 132 nm for the double-pass one, respectively, which are both over the whole conventional band and long-wavelength band. The ripple on the matching response can keeps less than 0.2 dB as well.

• Periodical: Advanced Materials Research (Volumes 989-994)
• Pages: 3790-3793
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.989-994.3790
• Online since: July 2014
• Authors: Hai Dong Wu*, Jin Song Guo, Yun Wen Wu, Zhao Xia Wang
• Keywords: Bandwidth, Ccascaded Second Harmonic Generation, Difference Frequency Generation, Quasi-Phase Matching, Wavelength Conversion

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