Detailed large-signal dynamic modelling of DFB laser structures and comparison with experiment |
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| Authors: | J E A Whiteaway A P Wright B Garrett G H B Thompson J E Carroll L M Zhang C F Tsang I H White K A Williams |
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| Institution: | (1) BNR Europe Limited, London Road, CM17 9NA Harlow, Essex, UK;(2) NT Europe Limited, Brixham Road, TQ4 7BE Paignton, Devon, UK;(3) Engineering Department, Cambridge University, Trumpington Street, CB2 1PZ Cambridge, UK;(4) School of Physics, University of Bath, Claverton Down, BA2 7AY Bath, UK |
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| Abstract: | This paper describes the first general large-signal dynamic multiple-mode laser model that incorporates all the main mechanisms known to influence the dynamic behaviour of DFB laser structures with the exception of thermal effects: longitudinal mode spatial hole burning, carrier transport effects, nonlinear gain, and laser and submount parasitics. The time evolution of the output power and wavelength of all modes is predicted, and full spectra can be plotted as a function of time. The model has been extended to include an approximation to the effects of propagation down dispersive fibre, thereby allowing the simulation of filtered received eye diagrams. Detailed comparison of the model with the experimental performance of 2× /8 DFB lasers has shown good agreement, allowing the performance to be optimized, particularly with respect to longitudinal hole burning and carrier transport. The model is also applied to gain-switched operation of 2×/8 DFB structures, fast pulsing of three-section /4 DFB lasers, and the dynamic behaviour of complex coupling coefficient DFB laser structures. |
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