All-optical ultrawideband monocycle and doublet generation using cascaded PPLN waveguides

Jian Wang; Junqiang Sun; Qizhen Sun

doi:10.1117/12.745306

19 November 2007 All-optical ultrawideband monocycle and doublet generation using cascaded PPLN waveguides

Jian Wang, Junqiang Sun, Qizhen Sun

Author Affiliations +

Proceedings Volume 6782, Optoelectronic Materials and Devices II; 678230 (2007) https://doi.org/10.1117/12.745306
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China

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).

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Jian Wang, Junqiang Sun, and Qizhen Sun "All-optical ultrawideband monocycle and doublet generation using cascaded PPLN waveguides", Proc. SPIE 6782, Optoelectronic Materials and Devices II, 678230 (19 November 2007); https://doi.org/10.1117/12.745306

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KEYWORDS

Second-harmonic generation

Waveguides

Signal processing

Picosecond phenomena

Wave propagation

Data conversion

Optoelectronics

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