DFB laser amplifiers are very attractive for optical filtering because they can serve both as channel and noise filters and at the same time provide amplification. They may be used as filters in switching network or as receiver preamplifiers in multichannel direct detection systems 1. Amplifiers incorporating DFB structures have also been suggested for wavelength converters 2. For such applications it is important to understand the dynamic behaviour of DFB amplifiers when they are used in high speed systems. Especially, it is interesting to know the influence of the very narrow gain spectrum on short optical pulses. Here we present a dynamic model for DFB amplifiers which takes both the time and longitudinal variations of the electric field distribution as well as the carrier distribution into account. Using this model the amplification of narrow optical pulses has been studied for both low and high pulse energies corresponding to pre- and booster-amplifier applications, respectively. Previously fast pulse amplification in travelling wave amplifiers has been reported in the literature.
This article is from 'OSA Proceedings of the Topical Meeting on Optical Amplifiers and their Applications Held in Snowmass Village, Colorado on 24-26 July 1991. Volume 13,' AD-A252 974, p241 thru p244.