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Updated: Jun 30, 2026
07:55
Fabrication of Surface Acoustic Wave Devices on Lithium Niobate
Published on: June 18, 2020
[Wavelength conversion and spectral analysis in periodically polarized lithium niobate waveguide]
Chuan-hong Luo1, Jun-qiang Sun, Yuan-xiang Zhu
1School of Optoelectronics Sciennce and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. chluo@whu.edu.cn
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|September 20, 2008
Summary
Wavelength conversion using cascaded second harmonic and difference frequency generation in PPLN waveguides was studied. Pulsed pumping causes waveform distortion due to group velocity mismatch, limiting data transparency but offering tunable, multi-channel conversion for optical networks.
Area of Science:
- Nonlinear optics
- Integrated photonics
Context:
- Periodically poled lithium niobate (PPLN) waveguides are key for nonlinear optical processes.
- Cascaded second harmonic generation (SHG) and difference frequency generation (DFG) enable wavelength conversion.
Purpose:
- To experimentally investigate wavelength conversion using pulsed pumping in PPLN waveguides.
- To analyze the impact of group velocity mismatch (GVM) on pulsed wavelength conversion.
Summary:
- Pulsed pumping with cascaded SHG/DFG in PPLN waveguides was researched.
- Group velocity mismatch between pump and second harmonic (SH) pulses causes temporal walk-off and broadening, leading to waveform distortion in the generated difference frequency (DF) pulse.
- Despite distortion, the method allows tunable, single-to-multiple channel wavelength conversion.
Impact:
- Pulsed pumping wavelength conversion is disadvantageous for data transparency due to waveform distortion.
- This technique offers significant potential for future optical networks, enabling flexible WDM network management through tunable and multi-channel conversion.
- The experimental setup demonstrated tunable, single-to-dual channel conversion, replicating data rates.
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