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25 GHz modulation bandwidth is achieved from a fully packaged 1.55 mu m DFB laser, using devices with p-doped compressively strained MQW active regions and large negative wavelength detuning. Devices on submounts show a record bandwidth of 26 GHz, limited by device and bonding parasitics. Resonance frequencies of over 26 GHz are measured. >

34, 17 and 14 ps pulses have been generated at repetition rates of 2.5, 5 and 10 GHz, respectively, from an integrated laser modulator at 1.5 µm. Pulse widths were significantly reduced by modulating at both the fundamental and the second harmonic frequencies.

The first results of an actively mode-locked semiconductor laser diode using a fibre external cavity with integrated Bragg reflector are reported. The device produces transform limited pulses of 18-5ps FWHM at a repetition rate of 2-37GHz. High peak power of 49 mW in the output fibre is achieved.

Two wavelength division multiplexed soliton pulse trains (2*2 Gbit/s 0101. . .) have been propagated more than 9000 km with less than 10/sup -9/ bit error rate for both channels. Soliton collisions have no effect on the error rate for wavelength separations larger than 7 AA or for collisions centred inside the fibre. >

A scheme for using semiconductor laser amplifiers for simultaneous compensation of both the fibre loss and the fibre dispersion in the 1.5 mu m region is proposed and demonstrated. Experimentally, the authors demonstrate propagation of 16 Gbit/s pulses over 70 km of non-dispersion-shifted fibre at 1.53 mu m wavelength. This distance is four times longer than the fundamental dispersion limit for transform-limited pulses. >