Cf. Lam, A simplified model for estimating the capacity limit of an optical link intransporting multichannel M-QAM signals, IEEE PHOTON, 12(11), 2000, pp. 1579-1581
We present a simplified model for quick estimation of the ultimate capacity
of subcarrier multiplexed lightwave system using M-QAM, This analytical mo
del assumes a directly modulated laser diode under relative intensity noise
limitation and clipping distortion. Our results show very good agreement w
ith those obtained using full analysis.