Reconfigurable optical generation of nine Nyquist WDM channels with sinc-shaped temporal pulse trains using a single microresonator-based Kerr frequency comb

Fatemeh Alishahi, Ahmad Fallahpour, Amirhossein Mohajerin-Ariaei, Yinwen Cao, Arne Kordts, Martin Hubert Peter Pfeiffer, Maxim Karpov, Ahmed Almaiman, Peicheng Liao, Kaiheng Zou, Cong Liu, Ari N. Willner, Moshe Tur, Tobias J. Kippenberg, Alan E. Willner

Research output: Contribution to journalArticlepeer-review

Abstract

Sinc-shaped temporal pulse trains have a spectrally efficient, rectangular Nyquist spectrum. We demonstrate the simultaneous and reconfigurable optical generation of multiple Nyquist-shaped wavelength-division-multiplexed (WDM) channels having temporal sinc-shaped pulse trains as data carriers. The channels are generated through the insertion of coherent lines using cascaded continuous-wave amplitude modulation around the spectral lines of a microresonator-based Kerr optical frequency comb. For each of nine Kerr frequency comb lines, we insert sub-groups of uniform and coherent lines to generate nine WDM channels. The deviations from ideal Nyquist pulses for the nine channels at repetition rates of 6 and 2 GHz are between 4.2%–6.1% and 2%–4.5%, respectively. Each WDM channel is modulated with on–off keying (OOK) at 6 Gbit/s. In addition, we show the reconfigurability of this method by varying the number of WDM channels, the generated sinc-shaped pulse train repetition rates, the duration, and the number of zero-crossings.

Original languageEnglish
Pages (from-to)1852-1855
Number of pages4
JournalOptics Letters
Volume44
Issue number7
DOIs
StatePublished - 1 Apr 2019

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