Improved phase noise performance using orthogonal ternary codes over spectral polarization and amplitude coding networks

Jen-Fa Huan, Yao Tang Chang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study proposes an improved hybrid scheme of spectral polarization coding (SPC) and spectral amplitude coding (SAC) based on a specified orthogonal ternary sequence. In a previous SPC scheme, the entire wavelength was assigned either a vertical or a horizontal state of polarization. However, this study assigns positive, negative, or null chip values to individual wavelengths to create an orthogonal ternary sequence based on the bipolar Walsh-Hadamard matrix. This approach reduces the number of wavelength collisions at the photodetector and hence reduces the phase-induced intensity noise (PIIN). Neglecting the effects of shot noise and thermal noise, we consider only PIIN with a degree of polarization P=0. The proposed scheme improves the bit error rate by 40% and 100% over SPC and complementary unipolar SAC schemes. The number of simultaneous active users supported by the hybrid scheme for the worst case (P=1) is improved by 41.3% over the complementary unipolar SAC coding scheme for the ideal case (P=0).

Original languageEnglish
Article number015005
JournalOptical Engineering
Volume46
Issue number1
DOIs
Publication statusPublished - 2007 Jan 1

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Network coding
Phase noise
coding
Polarization
polarization
Wavelength
noise intensity
Hadamard matrices
Shot noise
Thermal noise
wavelengths
Photodetectors
Bit error rate
thermal noise
shot noise
bit error rate
photometers
chips
collisions
matrices

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

Cite this

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abstract = "This study proposes an improved hybrid scheme of spectral polarization coding (SPC) and spectral amplitude coding (SAC) based on a specified orthogonal ternary sequence. In a previous SPC scheme, the entire wavelength was assigned either a vertical or a horizontal state of polarization. However, this study assigns positive, negative, or null chip values to individual wavelengths to create an orthogonal ternary sequence based on the bipolar Walsh-Hadamard matrix. This approach reduces the number of wavelength collisions at the photodetector and hence reduces the phase-induced intensity noise (PIIN). Neglecting the effects of shot noise and thermal noise, we consider only PIIN with a degree of polarization P=0. The proposed scheme improves the bit error rate by 40{\%} and 100{\%} over SPC and complementary unipolar SAC schemes. The number of simultaneous active users supported by the hybrid scheme for the worst case (P=1) is improved by 41.3{\%} over the complementary unipolar SAC coding scheme for the ideal case (P=0).",
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Improved phase noise performance using orthogonal ternary codes over spectral polarization and amplitude coding networks. / Huan, Jen-Fa; Chang, Yao Tang.

In: Optical Engineering, Vol. 46, No. 1, 015005, 01.01.2007.

Research output: Contribution to journalArticle

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