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Proceedings Paper

All-optical ultrawideband monocycle and doublet generation using cascaded PPLN waveguides
Author(s): Jian Wang; Junqiang Sun; Qizhen Sun
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Paper Abstract

Ultrawideband (UWB) is an attractive technology for short-range high-capacity wireless communication systems. A novel all-optical method for generating UWB pulses is proposed and theoretically analyzed using cascaded periodically poled LiNbO3 (PPLN) waveguides. The operation principle relies on the sum-frequency generation (SFG) in the first PPLN and the cascaded second-harmonic generation and difference-frequency generation (SHG+DFG) in the second PPLN. We simulate the proposed PPLN-based UWB pulses generation using the well-known coupled-mode equations describing the SFG and SHG+DFG processes. A pair of polarity-reversed UWB monocycle pulses is generated with a central frequency of 5 GHz and a 10 dB bandwidth of 8.75 GHz. Thus the fractional bandwidth is 175%. Moreover, a pair of polarity-reversed UWB doublet pulses is also obtained. One has a central frequency of 5 GHz, a 10 dB bandwidth of 7.5 GHz, and a fractional bandwidth of 150%, and the other has a central frequency of 5 GHz, a 10 dB bandwidth of 3.75 GHz, and a fractional bandwidth of 75%. It is found that all generated pairs of polarity-reversed UWB monocycle and doublet pulses match well with the UWB definition of Federal Communications Commission (FCC).

Paper Details

Date Published: 19 November 2007
PDF: 8 pages
Proc. SPIE 6782, Optoelectronic Materials and Devices II, 678230 (19 November 2007); doi: 10.1117/12.745306
Show Author Affiliations
Jian Wang, Huazhong Univ. of Science and Technology (China)
Junqiang Sun, Huazhong Univ. of Science and Technology (China)
Qizhen Sun, Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 6782:
Optoelectronic Materials and Devices II
Yoshiaki Nakano, Editor(s)

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