Processing for dispersive intensity-modulation and direct-detection fiber-optic communications

Ji Zhou, Haide Wang, Yuanhua Feng, Weiping Liu, Shecheng Gao, Changyuan Yu, Zhaohui Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


In intensity-modulation and direct-detection (IM/DD) fiber-optic communications, it is hard to pre- or post-compensate for chromatic dispersion (CD) by digital signal processing due to one-dimensional modulation and detection. In this Letter, we propose joint optical and digital signal processing to effectively compensate for CD-caused distortions for IM/DD optical systems. As a reasonable optical signal processing, negative chirp based on self-phase modulation can suppress a part of CD to take pressure off digital signal processing. Digital signal processing is designed based on the model of a dispersive channel to accurately compensate for CD-caused distortions. To the best of our knowledge, we present a record C-band 72 Gbit/s optical on–off keying over 100 km dispersion-uncompensated link (i.e., ∼1700 ps/nm dispersion), achieving a 7% hard-decision forward error correction limit. We conclude that joint optical and digital signal processing is effective in dealing with CD-caused distortions to achieve a higher capacity–distance product in IM/DD fiber-optic communications.

Original languageEnglish
Pages (from-to)138-141
Number of pages4
JournalOptics Letters
Issue number1
Publication statusPublished - 1 Jan 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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