An erbium power amplifier is used to give a system launch power in excess of +20 dBm. In conjunction with an FSK modulation technique this allows unrepeatered transmission over 250 km of step-index fibre with a loss of 50 dB and a total dispersion of 3930 ps nm-1.
Bibliographical noteTimes Cited: 8
Ellis, A. D., Stallard, W. A., Bryant, E. G., Carter, S. F., Wright, J. V., & Wyatt, R. (1990). Unrepeatered 2.4 Gbit/s transmission experiment over 250 km of step-index fibre using erbium power amplifier. Electronics letters, 26(8), 528-530. https://doi.org/10.1049/el:19900343