Widely-Linear Nyquist Criterion for DFT-Spread OFDM with Frequency-Domain Spectrum Shaping

Choi, Jeonghoon; Kim, Jubum; Cho, Joon Ho; Lehnert, J.S.

doi:10.1109/icc42927.2021.9500321

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2024

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“…Due to the rectangular-shaped spectrum and sinc-shaped temporal waveform, Nyquist pulses have high value in modern communication technology, from electronic communications to optical communications and ultrafast science. For example, in the field of optical communications, [2][3][4][5][6][7][8][9][10][11][12][13][14][15] Nyquist pulses can increase the bandwidth of the systems. [16] Various studies on Nyquist pulses have been reported.…”

Section: Introductionmentioning

confidence: 99%

On the generation of high-quality Nyquist pulses in mode-locked fiber lasers

Ren 任,

Ge 葛,

Li 李

et al. 2024

Chinese Phys. B

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Nyquist pulses have wide applications in many areas, from electronics to optics. Mode-locked lasers are ideal platform to generate such pulses. However, how to generate high-quality Nyquist pulses in mode-locked lasers remain elusive. We address this problem by managing different physical effects in mode-locked fiber lasers through extensive numerical simulations. We find that net dispersion, linear loss, gain and filter shaping can affect the quality of Nyquist pulses significantly. We also demonstrate that Nyquist pulses experiences similariton shaping due to the nonlinear attractor effect in the gain medium. Our work may contribute to the design of Nyquist pulse sources and enrich the understanding of pulse shaping dynamics in mode-locked lasers.

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