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The transmission characteristics of a novel amplifying Sagnac loop incorporating an erbium doped fibre amplifier and a semiconductor laser amplifier are reported. The transmission characteristics of such loops at low input powers (<25 mu W in this device) have a nonlinear (approximately cubic) form which has been characterised experimentally and used for all-optical pulse shaping and pulse compression...
A nonlinear fibre mirror, using a semiconductor laser amplifier and an erbium-doped fibre amplifier, is used as both the gain medium and saturable absorber in a passively mode locked fibre ring laser. Pulses of less than 100 ps duration were generated at repetition rates of up to 2 GHz.<<ETX>>
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