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Optical Engineering

Improved phase noise performance using orthogonal ternary codes over spectral polarization and amplitude coding networks
Author(s): Jen-Fa Huang; Yao-Tang Chang
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Paper 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).

Paper Details

Date Published: 1 January 2007
PDF: 11 pages
Opt. Eng. 46(1) 015005 doi: 10.1117/1.2432883
Published in: Optical Engineering Volume 46, Issue 1
Show Author Affiliations
Jen-Fa Huang, National Cheng Kung Univ. (Taiwan)
Yao-Tang Chang, National Cheng Kung Univ. (Taiwan)


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