Title :
Generation of arbitrary quadrature signals using one dual-drive Modulator
Author :
Ho, Keang-Po ; Cuei, Han-Wei
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
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.
Keywords :
differential phase shift keying; optical modulation; optical transmitters; quadrature amplitude modulation; quadrature phase shift keying; QPSK signals; dual-drive Mach-Zehnder modulator; quadrature-amplitude modulation; quadrature-phase-shift-keying signals; transmitters; Amplitude modulation; Constellation diagram; Optical interferometry; Optical transmitters; Phase modulation; Phase shift keying; Polarization; Quadrature amplitude modulation; Quadrature phase shift keying; Signal generators; Differential quadrature phase-shift keying (DQPSK); external modulator; quadrature amplitude modulation; spectral efficiency;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2004.838855
