Summary form only given. The random phase differences between facet reflectors and those due to the Bragg grating in uniform grating DFB lasers cause significant variations in the spectral characteristics from device to device. This results in a spread in the transmission performance for long haul fibre links. It is uneconomical to fail packaged components, therefore it is necessary to do comprehensive system modelling. In this paper, this spread in system penalty for varying coupling strength (/spl kappa/L) is modelled using a travelling wave laser model, and a single mode fibre model. Good agreement is found with experiment for InGaAsP, MQW, ridge waveguide, HR/AR(75%-3%) coated DFB lasers operating at 1.55 /spl mu/m.
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