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Generation of arbitrary quadrature signals using one dual-drive Modulator

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2 Author(s)
Keang-Po Ho ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Han-Wei Cuei

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.

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Lightwave Technology, Journal of  (Volume:23 ,  Issue: 2 )