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A polarization-independent optical limiter is proposed using two-stage polarization-diversity configured optical parametric amplifiers in gain-saturated condition. Its amplitude level equalizing effect is successfully demonstrated for a 40 Gb/s signal with less than 0.2 dB polarization dependence.
An all-optical parametric fiber switch for all-optical amplitude noise suppression was applied mid-span in a 107 Gb/s differential phase shift keying (DPSK) transmission experiment. Using this switch an improved performance after 320 km transmission was achieved.
A novel transparent demultiplexer for ultra fast pulse trains using a 19 m long HNLF-based parametric amplifier is proposed. Using this multiplexer, 320-10 Gb/s OTDM DEMUX with parametric gains over 20 dB were successfully implemented
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