Efficient 330-Gb/s PAM-8 modulation using silicon microring modulators

David W.U. Chan, Xiong Wu, Chao Lu, Alan Pak Tao Lau, Hon Ki Tsang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


We propose and demonstrate a high-efficiency silicon microring modulator for next-generation optical transmitters operating at line rates above 300 Gb/s. The modulator supports high-order PAM-8 modulation up to 110 Gbaud (330 Gb/s), with a driving voltage of 1.8 Vpp. The small driving voltage and device capacitance yields a dynamic energy consumption of 3.1 fJ/bit. Using the modulator, we compare PAM-8 with ultrahigh baud rate PAM-4 of up to 130 Gbaud (260 Gb/s) and show PAM-8 is better suited for 300-Gb/s lane rate operation in bandwidth-constrained short-reach systems.

Original languageEnglish
Pages (from-to)1036-1039
Number of pages4
JournalOptics Letters
Issue number4
Publication statusPublished - 15 Feb 2023

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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