Performance analysis of a dicode PPM system, operating over plastic optical fibre, using maximum likelihood sequence detection

M. Sibley

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Dicode pulse-position modulation (PPM) systems suffer from three types of pulse detection errors: wrong-slot, false-alarm and erasure. The author presents an original maximum likelihood sequence detector (MLSD) algorithm that uses the natural pulse sequences in dicode PPM to completely eliminate wrong-slot errors, and reduce the effects of false alarms and erasures. The error performance of a dicode PPM system using such a detector is analysed, and theoretical results are presented for a system transmitting 1 Gbit/s PCM data over a dispersive medium, such as graded-index plastic optical fibre, with a wide-bandwidth receiver and a classical matched filter. It is shown that little is gained if MLSD is used in a low-dispersion link. However, if the link bandwidth is equal to 0.46 times the PCM bit-rate, an MLSD dicode PPM system requires 4.0 × 104 photons per pulse, as opposed to 66 × 104 photons for a system without MLSD. This corresponds to a 12.2 dB increase in sensitivity. It is further shown that an MLSD dicode system can operate down to a bandwidth of 0.29 times the PCM bit-rate, making it an ideal candidate for high-dispersion links.

LanguageEnglish
Pages337-343
Number of pages7
JournalIEE Proceedings: Optoelectronics
Volume152
Issue number6
DOIs
Publication statusPublished - 19 Dec 2005

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pulse position modulation
Plastic optical fibers
plastic fibers
Pulse position modulation
Maximum likelihood
optical fibers
Detectors
Pulse code modulation
detectors
false alarms
bandwidth
Bandwidth
slots
Telecommunication links
Photons
pulses
matched filters
Matched filters
Error detection
photons

Cite this

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title = "Performance analysis of a dicode PPM system, operating over plastic optical fibre, using maximum likelihood sequence detection",
abstract = "Dicode pulse-position modulation (PPM) systems suffer from three types of pulse detection errors: wrong-slot, false-alarm and erasure. The author presents an original maximum likelihood sequence detector (MLSD) algorithm that uses the natural pulse sequences in dicode PPM to completely eliminate wrong-slot errors, and reduce the effects of false alarms and erasures. The error performance of a dicode PPM system using such a detector is analysed, and theoretical results are presented for a system transmitting 1 Gbit/s PCM data over a dispersive medium, such as graded-index plastic optical fibre, with a wide-bandwidth receiver and a classical matched filter. It is shown that little is gained if MLSD is used in a low-dispersion link. However, if the link bandwidth is equal to 0.46 times the PCM bit-rate, an MLSD dicode PPM system requires 4.0 × 104 photons per pulse, as opposed to 66 × 104 photons for a system without MLSD. This corresponds to a 12.2 dB increase in sensitivity. It is further shown that an MLSD dicode system can operate down to a bandwidth of 0.29 times the PCM bit-rate, making it an ideal candidate for high-dispersion links.",
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Performance analysis of a dicode PPM system, operating over plastic optical fibre, using maximum likelihood sequence detection. / Sibley, M.

In: IEE Proceedings: Optoelectronics, Vol. 152, No. 6, 19.12.2005, p. 337-343.

Research output: Contribution to journalArticle

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