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https://doi.org/10.1109/49.59128
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. https://doi.org/10.1109/49.59128 | 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 | URI: | http://scholarbank.nus.edu.sg/handle/10635/80928 | ISSN: | 07338716 | DOI: | 10.1109/49.59128 |
Appears in Collections: | Staff Publications |
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