Generation and autocorrelation traces investigation of Nyquist pulse sequences

• Published in: Optics communications 2024-10, Vol.569, p.130824, Article 130824
• Main Authors: Li, Jiakang, Yao, Yusheng, Jia, Dongfang, Ge, Chunfeng, Wang, Zhaoying, Yang, Tianxin
• Format: Article
• Language: English
• Subjects: Autocorrelation traces; Nyquist pulse sequences; Pulse measurement
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2024.130824

We propose a novel approach for generating Nyquist pulse sequences using a dual parallel Mach-Zehnder modulator (DPMZM) and a phase modulator (PM). The generated Nyquist pulse sequence achieves a repetition frequency of 10 GHz and a full width at half maximum (FWHM) of 4.22 ps. The time-domain waveforms of these sequences are retrieved using the phase and intensity from cross-correlation and spectrum only (PICASO) method. Further investigation into the autocorrelation traces reveals a pulse width conversion factor of approximately 0.75 between the Nyquist pulse sequences and their autocorrelation traces. Our work offers an alternative approach to generating and measuring Nyquist pulse sequences. •A novel approach is proposed for generating Nyquist pulse sequences using a DPMZM and a PM.•The characterization of Nyquist pulse’s autocorrelation traces is investigated for the first time.•The pulse width conversion factor between the Nyquist pulses and their autocorrelation traces is about 0.75.•An algorithm called PICASO is used to retrieve the time-domain waveforms of the Nyquist pulse sequences.