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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 23,
  • Issue 2,
  • pp. 764-
  • (2005)

Generation of Arbitrary Quadrature Signals Using One Dual-Drive Modulator

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Abstract

Regardless of the number of constellation points, all quadrature-amplitude modulation (QAM) signals can be generated using a single dual-drive Mach-Zehnder modulator. When the general method is applied to quadrature-phase-shift-keying (QPSK) signals, three different QPSK transmitters are shown with drive signals having four, three, or two levels. The usage of only one dual-drive modulator greatly simplifies the design of QAM and QPSK transmitters.

© 2005 IEEE

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