Realization of OSW/AWG-based bipolar wavelength-time optical CDMA for wired-wireless transmissions

Chih Ta Yen, Jen Fa Huang

研究成果: Article同行評審

5 引文 斯高帕斯(Scopus)

摘要

This study proposes a novel radio-over-fiber (RoF) system using two-dimensional (2-D) optical code-division multiple-access (OCDMA) scheme using pseudorandom (PN) codes for the time-spreading and wavelength-hopping (t-spreading/λ-hopping) codes. The 2-D system is implemented using optical switches (OSWs) and arrayed-waveguide grating (AWG) routers. By constructing 2-D codes using bipolar PN codes rather than unipolar codes provides a significant increase in the maximum permissible number of active radio base stations (RBSs). In general, the phase-induced intensity noise (PIIN) generated at high optical intensities significantly degrades the performance of a conventional multi-wavelength scheme. However, the OSW-based time-spreading method employed in the current 2-D OCDMA scheme effectively suppresses the PIIN effect. Additionally, multiple-access interference (MAI) is suppressed by the use of a wavelength/time balanced detector structure in the network receivers. The numerical evaluation results demonstrate that under PIIN- and MAI-limited conditions, the proposed system outperforms a conventional multi-wavelength OCDMA scheme by using the spectral spreading scheme to suppress beating noise. Especially, the t-spreading encoder/decoder (codec) groups share the same wavelength codec and the overall complexity is reduced and system network becomes more compact.

原文English
頁(從 - 到)74-82
頁數9
期刊Optical Fiber Technology
15
發行號1
DOIs
出版狀態Published - 2009 一月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 控制與系統工程
  • 原子與分子物理與光學
  • 儀器
  • 電氣與電子工程

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