Please use this identifier to cite or link to this item:
Title: Overmodulation in subcarrier multiplexed video FM broad-band optical networks
Authors: Mendis, Frederick V.C. 
Tan, B.T. 
Issue Date: Sep-1990
Citation: Mendis, Frederick V.C., Tan, B.T. (1990-09). Overmodulation in subcarrier multiplexed video FM broad-band optical networks. IEEE Journal on Selected Areas in Communications 8 (7) : 1285-1289. ScholarBank@NUS Repository.
Abstract: The probability of an SCM (subcarrier multiplexed) signal falling outside the linear region of a laser diode is calculated in order to determine the overmodulation that may be practically employed for multichannel video distribution in single-octave SCM networks. The overmodulation is predicted as a function of the number of subcarriers in single-octave SCM systems supporting up to about 70 FM video channels, for SNRs (signal-to-noise ratios) of 47 dB (I/PAL), and 56 dB (M/NTSC). The RMS optical modulation index (OMI) is demonstrated to be a more useful performance parameter than the linear OMI in SCM systems carrying a large number of channels. A 47-dB weighted SNR (with 4-dB margin) is deemed sufficient for acceptable picture quality in cable distribution systems, whereas a 56-dB value would be required for long-distance point-to-point optical links. RMS OMI values of around 70 and 50, respectively, can be employed.
Source Title: IEEE Journal on Selected Areas in Communications
ISSN: 07338716
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Feb 27, 2018


checked on Oct 8, 2021

Page view(s)

checked on Jan 20, 2022

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.