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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
DOI: 10.1109/49.59128
Appears in Collections:Staff Publications

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