Title :
Power spectra of return-to-zero optical signals
Author :
Ip, Ezra ; Kahn, Joseph M.
Author_Institution :
Dept. of Electr. Eng., Stanford Univ., CA
fDate :
3/1/2006 12:00:00 AM
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
Keywords :
Mach-Zehnder interferometers; amplitude shift keying; differential phase shift keying; optical fibre communication; optical modulation; DPSK; M-ary differential phase-shift keying; Mach-Zehnder modulators; OOK; PSK; QAM; binary on-off keying; duobinary OOK; phase-shift keying; pulse duty cycle; quadrature-amplitude modulation; return-to-zero optical signals; Differential phase shift keying; Differential quadrature phase shift keying; Optical modulation; Optical pulses; Phase modulation; Phase shift keying; Power generation; Pulse modulation; Signal analysis; Signal generators;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2005.863328
