Abstract
A new dispersion map is designed for three-level code division multiplexing (3LCDM) of a 40 Gb/s $$(2\times 20\, \hbox {Gb/s})$$(2×20Gb/s) over 500 km $$(5\times 100\,\hbox {km})$$(5×100km) standard single mode fiber. The results show that an 87.5 % dispersion compensation ratio was the optimum map for the 3LCDM system. The system performance is improved by 6 dB in optical signal-to-noise ratio, 6 dB in receiver sensitivity and 3 dB in self-phase modulation threshold. Based on these improvements, the 3LCDM performance is comparable to the available multiplexing and modulation techniques while offering simpler transmitter and receiver architecture.
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