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Sensitivity evaluation of EDFA PPM systems under chromatic dispersion
Author(s) -
Hussain A.,
Elmirghani J. M. H.,
Cryan R. A.
Publication year - 1996
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(199609)13:1<14::aid-mop5>3.0.co;2-q
Subject(s) - sensitivity (control systems) , dispersion (optics) , optics , pulse position modulation , pulse (music) , optical communication , optical fiber , degradation (telecommunications) , pulse width modulation , physics , modulation (music) , materials science , electronic engineering , engineering , pulse amplitude modulation , acoustics , quantum mechanics , voltage , detector
An optically preamplified pulse position modulation (PPM) system operating at 622 Mbit/s and λ = 1.53 μm is analyzed, and is shown to offer a sensitivity benefit of 9.2 dB over an equivalent OOK system. Fiber chromatic dispersion is taken into account and is used to estimate the received pulse shape. Pulse dispersion can potentially induce a significant performance penalty in PPM systems because of the temporal nature of the PPM format. The results show that for a transmitted pulse of duration 80 ps, the received pulses have full widths at half maximum (FWHM) of 160 and 320 ps for fiber lengths equaling 120 and 240 km, respectively. The system sensitivity degradation due to dispersion is explicitly evaluated. It is shown that a sensitivity penalty of up to 5 dB can be incurred over the transmission spans considered. © 1996 John Wiley & Sons, Inc.