Title :
Investigation of transmission performance of 40-gb/s conventional DCS-RZ signals and DCS-RZ signals generated from phase-modulated duobinary signals
Author :
Kim, YongHoon ; Jang, Hodeok ; Hur, Sub ; Oh, Tae Won ; Kim, Young Sik ; Jeong, Jichai
Author_Institution :
Dept. of Radio Eng., Korea Univ., Seoul
Abstract :
A 40-Gb/s duobinary carrier-suppressed return-to-zero (DCS-RZ) signal format generated from phase-modulated (PM) duobinary signals by using a phase modulator and an external intensity modulator is proposed. The transmission performance of the proposed DCS-RZ format is theoretically investigated. The proposed DCS-RZ format can produce a signal bandwidth similar to that produced by the conventional DCS-RZ format generated from conventional duobinary signals using low-pass filters. However, the receiver sensitivities of the proposed DCS-RZ format can be improved by about 2 dB more than those of the conventional DCS-RZ format due to high extinction ratio and nonlinear tolerance. Due to a short pulse of the proposed DCS-RZ format, the tolerance of the first-order polarization mode dispersion (PMD) for the format can be improved by about 1 dB up to the differential-group-delay (DGD) value of 16 ps
Keywords :
delays; intensity modulation; low-pass filters; optical fibre communication; optical fibre dispersion; optical fibre polarisation; optical modulation; optical receivers; phase modulation; 16 ps; 40 Gbit/s; DCS-RZ signals; carrier-suppressed signal format; differential-group-delay; duobinary signals; external intensity modulator; extinction ratio; low-pass filters; nonlinear tolerance; phase modulation; phase modulator; polarization mode dispersion; receiver sensitivities; return-to-zero signal format; signal bandwidth; transmission performance; Bandwidth; Data communication; Extinction ratio; Filters; Intensity modulation; Optical fiber polarization; Phase modulation; Polarization mode dispersion; Signal generators; Transmitters; Duobinary; modulation format; optical communication; simulation;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2006.879507
