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. © 2007 Society of Photo-Optical Instrumentation Engineers. DOI: 10.1117/1.2432883 Subject terms: optical code-division multiple-access; hybrid spectral polarization and amplitude coding; fiber Bragg grating; polarization beamsplitter; multiple- access interference; phase-induced intensity noise.
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