Semiconductor laser optical amplifiers offer the possibility of simultaneous amplification of several signals in a multichannel coherent optical transmission system [1]. However, to take full advantage of this possibility the optical amplifiers must be broadband (travelling wave amplifiers). In this paper we report on two channel transmission experiments in a 560 Mbit/s DPSK transmission system at 1,3 μm with use of two cascaded in-line optical amplifiers having a 3 dB bandwidth of more than 4 THz. In previous experiments with cascaded inline optical amplifiers the bandwidth of the optical amplifiers was much narrower, for instance 15 GHz [2]. The aim of ' the present experiments is the investigation of crosstalk and of problems arrising from cascaded broadband in-line optical amplifiers.

© 1988 Optical Society of America

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