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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 24,
  • Issue 3,
  • pp. 1610-
  • (2006)

Power Spectra of Return-to-Zero Optical Signals

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Abstract

Analytical formulas for the power spectra of return-to-zero (RZ) optical signals generated by Mach-Zehnder (MZ) modulators are derived. Pulse duty cycles of 33%, 50%, and 67%, in conjunction with several modulation techniques, including binary ON-OFF keying (OOK), duobinary OOK, and M-ary differential phase-shift keying (DPSK), phase-shift keying (PSK), and quadrature-amplitude modulation (QAM), are considered. Spectral characteristics and bandwidth requirements of these different schemes are compared.

© 2006 IEEE

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