MPPM: a method for improving the band-utilization efficiency in optical PPM

Author

Sugiyama, Hisayoshi ; Nosu, Kiyoshi

Author_Institution

Electr. Commun. Lab., NTT, Kanagawa, Japan

Volume

7

Issue

3

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

465

Lastpage

472

Abstract

Multiple pulse position modulation (MPPM) is proposed as a modulation method to improve the band-utilization efficiency in optical pulse position modulation (PPM). Optical PPM gives higher transmission efficiency (bit/photon) in optical communications but degrades band-utilization efficiency. The proposed method reduces the required transmission bandwidth in optical PPM to about half with the same transmission efficiency, thus increasing band-utilization efficiency. While in conventional optical PPM, only one optical pulse is transmitted in every signal block, multiple pulses are transmitted using this method. Information is represented by different combinations of the positions of these pulses. The principle of bandwidth reduction applied, the transmission characteristics of the proposed method, and examples of improvement in band-utilization efficiency are also shown.<>

Keywords

optical communication; pulse position modulation; band-utilization efficiency; bandwidth reduction; multipulse pulse position modulation; Bandwidth; Counting circuits; Degradation; Optical detectors; Optical fiber communication; Optical mixing; Optical modulation; Optical pulses; Optical receivers; Pulse modulation;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.16882

Filename

16882