Diffused-junction GaAs electroluminescent diodes of small area and high radiance have been fabricated. It has been observed (1) that the degradation of these high-current-density cw diodes can be reduced greatly by superimposing a periodic reverse-bias pulse on the normal dc forward bias, and (2) that a previously degraded diode is restored to its initial light output by the influence of the built-in junction fields, or an applied dc reverse bias, at an elevated temperature.
Using a multiplexer and demultiplexer built from discrete GaAs FET's, a directly modulated distributed feedback laser, and a low capacitance avalanche photodiode receiver, we have achieved transmission at 4 Gbit/s over 103 km of single-mode optical fiber at 1.54 l m .
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