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Titolo:
Sensitivity enhancement of optical receivers by impulsive coding
Autore:
Winzer, PJ; Kalmar, A;
Indirizzi:
ViennaustriaUniv, Inst Nachrichtentech & Hochfrequenztech, A-1040 Vienna, A Vienna Tech Univ Vienna Austria A-1040 ochfrequenztech, A-1040 Vienna, A
Titolo Testata:
JOURNAL OF LIGHTWAVE TECHNOLOGY
fascicolo: 2, volume: 17, anno: 1999,
pagine: 171 - 177
SICI:
0733-8724(199902)17:2<171:SEOORB>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
SYSTEMS; DESIGN;
Keywords:
amplified spontaneous emission (ASE); noise; nonreturn-to-zero (NRZ); ON-OFF keying; optical amplifier; receiver sensitivity; return-to-zero (RZ);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
--discip_EC--
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Winzer, PJ ViennaustriaUniv, Inst Nachrichtentech & Hochfrequenztech, A-1040 Vienna, A Vienna Tech Univ Vienna Austria A-1040 tech, A-1040 Vienna, A
Citazione:
P.J. Winzer e A. Kalmar, "Sensitivity enhancement of optical receivers by impulsive coding", J LIGHTW T, 17(2), 1999, pp. 171-177

Abstract

A theory for the signal-to-noise ratio (SNR) of optical direct-detection receivers employing return-to-zero (RZ) coding land possibly optical preamplification) is developed. The results are valid for both signal-independent noise limited and signal-dependent noise limited receivers, as well as for arbitrary optical pulse shapes and receive filter characteristics. Even if the same receiver bandwidth is used, RZ coding is seen to perform better than nonreturn-to-zero (NRZ) coding. Asymptotic expressions for the SNR in case of very high and very low receiver bandwidths show that the full sensitivity enhancement potential of RZ coding is exhausted at fairly moderate duty cycles. A realistic example taking into account intersymbol interference (ISI) shows that a receiver sensitivity gain (compared to NRZ coding) of, e.g,, 3.2 dB can be obtained in a signal-independent noise limited receiver with a bandwidth of 80% of the data rate, using a duty cycle of three.

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Documento generato il 20/09/20 alle ore 21:36:59