An InGaAsP 1.3 μm amplifier-modulator integrated with a laser which is mode locked in a fibre resonator is demonstrated. Transform limited pulses with 25 ps duration were gated by the amplifier-modulator at a bit rate of 1.05 Gbit/s with an on/off ratio of 20 dB.
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Eisenstein et al. (1984) studied this question.