Subband Index Carrierless Amplitude and Phase Modulation for Optical Communications

Kabiru O. Akande, Wasiu O. Popoola

Research output: Contribution to journalArticlepeer-review


Subband index carrierless amplitude and phase modulation (SI-CAP) is proposed and investigated in this paper to improve the performance of multi-band CAP (m-CAP). The bit-error-rate (BER) analysis of the proposed SI-CAP is derived and verified through computer simulations. A detection scheme is also developed for SI-CAP, which achieves maximum likelihood performance at a significantly lower complexity. In addition, an experimental demonstration of the proposed SI-CAP is carried out for optical communication systems. Furthermore, an adaptive equalization technique is implemented to further enhance the performance gain of SI-CAP. It is shown that for the same order of complexity, the SI-CAP exhibits higher spectral and energy efficiency in comparison to m-CAP. Therefore, the performance gain of SI-CAP along with its design flexibility make it a suitable candidate for optical communication systems.

Original languageEnglish
Pages (from-to)4190-4197
Number of pages8
JournalJournal of Lightwave Technology
Issue number18
Early online date25 Jul 2018
Publication statusPublished - 15 Sep 2018


  • Multi-band carrierless amplitude and phase modulation (m-CAP)
  • optical communication
  • visible light communication (VLC)
  • index modulation (IM)
  • step-index plastic optical fibre (SI-POF)
  • adaptive equalization
  • CAP

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