Constructing a two bands optical code-division multiple-access network of bipolar optical access codecs using walsh-coded liquid crystal modulators

Chih Ta Yen, Jen Fa Huang, Ping En Chih

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

We propose and experimentally demonstrated the two bands optical code-division multiple-access (OCDMA) network over bipolar Walsh-coded liquid-crystal modulators (LCMs) and driven by green light and red light lasers. Achieving system performance depends on the construction of a decoder that implements a true bipolar correlation using only unipolar signals and intensity detection for each band. We took advantage of the phase delay characteristics of LCMs to construct a prototype optical coder/decoder (codec). Matched and unmatched Walsh signature codes were evaluated to detect correlations among multiuser data in the access network. By using LCMs, a red and green laser light source was spectrally encoded and the summed light dots were complementary decoded. Favorable contrast on auto- and cross-correlations indicates that binary information symbols can be properly recovered using a balanced photodetector.

原文English
文章編號08MB07
期刊Japanese journal of applied physics
53
發行號8 SPEC. ISSUE 2
DOIs
出版狀態Published - 2014 8月

All Science Journal Classification (ASJC) codes

  • 工程 (全部)
  • 物理與天文學 (全部)

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