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 Huan, Ping En Chih

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number08MB07
JournalJapanese Journal of Applied Physics
Volume53
Issue number8 SPEC. ISSUE 2
DOIs
Publication statusPublished - 2014 Jan 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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