Demonstration of laser-diode-pumped ultrafast all-optical switching in a nonlinear Sagnac interferometer

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Abstract
Ultrafast all-optical switching in a nonlinear Sagnac interferometer using picosecond pulses from a laser diode is reported. The key technologies are a highly stable fibre Sagnac interferometer with a long interaction length of 1600 m, and high-intensity 14 ps control pulses provided by a gain switched DFB-LD coupled with an erbium-doped fibre amplifier.