Digital pulse interval modulation for optical communications

Zabih Ghassemlooy, Andrew Hayes, N. L. Seed, Eraj Kaluarachchi

Research output: Contribution to journalArticlepeer-review

155 Citations (Scopus)


This article presents a study of digital pulse interval modulation (DPIM) for optical wireless communications using intensity modulation with direct detection. The DPIM code properties are discussed, and expressions for the transmission capacity, power spectrum, and error probability are presented. We show that for a given number of bits per symbol, DPIM has a higher transmission capacity, a similar spectral profile, and only a marginally inferior error probability performance compared with pulse position modulation, and is rather less complex to implement. Finally, problems associated with the nonuniform symbol length characteristics of DPIM together with possible solutions are discussed.
Original languageEnglish
Pages (from-to)95-99
JournalIEEE Communications Magazine
Issue number12
Publication statusPublished - Dec 1998


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