Title :
A low cost sub-carrier multiplexed PPM for optical fibre transmission systems
Author :
Ghassemlooy, Z. ; Wickramasinghe, V.R.
Author_Institution :
Sch. of Eng., Sheffield Hallam Univ., UK
fDate :
2/1/1998 12:00:00 AM
Abstract :
Sub-carrier multiplexed (SCM) optical fibre distributed broadband services suffer from system non-linearity and are sensitive to noise, thus imposing stringent noise and linearity requirements. As a result their performance is limited. However, system performance can be improved by incorporating a second stage modulator. In this paper a SCM optical transmission system employing pulse position modulation (PPM) as a second stage modulator for transmission of video, audio and data channels is reported. System measurements and theoretical predictions obtained are in close agreement and the results show an improvement in optical receiver sensitivity compared to a conventional SCM
Keywords :
broadband networks; data communication; optical fibre networks; optical modulation; optical receivers; pulse position modulation; subcarrier multiplexing; visual communication; SCM optical transmission system; audio channel; data channel; distributed broadband services; low cost sub-carrier multiplexed PPM; noise; nonlinearity; optical fibre transmission systems; optical receiver sensitivity; pulse position modulation; second stage modulator; system performance; video channel; Costs; Linearity; Optical fibers; Optical modulation; Optical noise; Optical pulses; Optical receivers; Optical sensors; Pulse modulation; System performance;
Journal_Title :
Consumer Electronics, IEEE Transactions on
