Adaptive threshold adjustment for signal-distortion-free digital-coherent optical demodulation system

Akito Chiba, Takahide Sakamoto, Tetsuya Kawanishi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Optical quadrature amplitude modulation (QAM) attracts considerable attention in the enhancement of communications capacity, due to its high spectral efficiency. However, this modulation format is more sensitive to signal distortion than conventional formats, making it more difficult to create, transmit, and detect signals. In this paper, we propose an adaptive scheme for demodulation of the distorted optical signals with paying attention to use of DSP-technology. The scheme is based on the adjustment of the thresholds against the signal distortion. Successful demodulation of optical QAM signals is demonstrated with a sufficiently low bit-error rate.

Original languageEnglish
Pages (from-to)21647-21655
Number of pages9
JournalOptics Express
Volume16
Issue number26
DOIs
Publication statusPublished - 2008 Dec 22
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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