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All laser diode compression of 5 GHz picosecond pulses using cross-phase modulation in optical fibre

All laser diode compression of 5 GHz picosecond pulses using cross-phase modulation in optical fibre

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5 GHz pulses from a mode-locked semiconductor laser diode have been compressed from 10.5 to 4.6 ps by means of crossphase modulation using a separate optically amplified mode-locked laser diode. By tuning the laser wavelengths symmetrically about the 1.55 μm dispersion zero of an 11km length of fibre, the effect of group velocity dispersion is minimised, ensuring that the fibre is used efficiently. The spectral broadening induced by the cross-phase modulation enables pulse compression in a dispersive fibre.


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