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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 4,
  • Issue 4,
  • pp. 199-201
  • (2006)

Performance evaluation of modulation formats in 40*40-Gb/s WDM repeaterless transmission systems

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Abstract

Transmission performance of six modulation formats is numerically compared in 40*40-Gb/s wavelength division multiplexing (WDM) repeaterless systems. The results indicate that return-to-zero differential phase shift keying (RZ-DPSK) (33% duty cycle) demonstrates the best performance among all the formats when the accumulated amplified spontaneous emission power (AASEP) is small. But with the increasing of AASEP, the superiority of RZ-DPSK transmission performance over the other five modulation formats is vanished. AASEP is justified to be the major source for the deterioration of the superiority.

© 2005 Chinese Optics Letters

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