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RZ versus NRZ modulation format for dispersion compensated SMF-based 10-Gb/s transmission with more than 100-km amplifier spacing



IEEE Photonics Technology Letters 11 (1999), No.4, pp.481-3
ISSN: 1041-1135
Journal Article
Fraunhofer HHI ()
compensation; optical fibre communication; optical fibre dispersion; optical modulation; optical receivers; sensitivity; nrz modulation format; rz modulation format; dispersion compensated smf-based gb/s transmission; km amplifier spacing; transmission behavi; return-to-zero modulated signals; nonreturn-to-zero modulated signals; standard single-mode fiber; alternating dispersion compensation scheme; recirculating loop; receiver sensitivities; linear dispersion compensation; nonlinear signal distortion; linear chromatic dispersion; under-compensation; transmission length; network design; 10 Gbit/s; 20 to 40 km; 102 km

We compared numerically and experimentally the transmission behavior of return-to-zero (RZ) and nonreturn-to-zero (NRZ) modulated signals, 10 Gb/s were transmitted over 2040-km standard single-mode fiber using an alternating dispersion compensation scheme in a recirculating loop with 102 km amplifier spacing. Receiver sensitivities of -33 dBm (NRZ) and -35 dBm (RZ) could be achieved. RZ allows for a simple linear dispersion compensation whereas NRZ suffers from nonlinear signal distortion. NRZ requires under-compensation of the linear chromatic dispersion dependent on signal power and transmission length. Therefore, NRZ makes network design more difficult.