1 January 2007 Improved phase noise performance using orthogonal ternary codes over spectral polarization and amplitude coding networks
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Optical Engineering, 46(1), 015005 (2007). doi:10.1117/1.2432883
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).
Jen-Fa Huang, Yao-Tang Chang, "Improved phase noise performance using orthogonal ternary codes over spectral polarization and amplitude coding networks," Optical Engineering 46(1), 015005 (1 January 2007). http://dx.doi.org/10.1117/1.2432883
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KEYWORDS
Polarization

Photodetectors

Computer programming

Fiber Bragg gratings

Signal to noise ratio

Optical engineering

Receivers

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