All-Optical Signal Reshaping of a 40 Gb/s RZ Signal by Dual-Stage Pump Modulated Four-Wave-Mixing
All-optical signal reshaping is demonstrated with a 40 Gb/s RZ signal by using two cascaded pump modulated four-wave-mixing processes. A 5 dB improvement in the receiver sensitivity is reported for a degraded signal input.
Optical 2R regeneration using cascaded fiber four-wave mixing with suppressed spectral spread
A fiber four-wave mixing (FWM)-based all-optical reshaping and reamplifying (2R) regeneration technique with near-ideal step-like transfer function and suppressed spectral spread is proposed. By setting proper phase modulation conditions and wavelength relations in a two-stage cascaded FWM approach, we succeeded in nearly spectral-spread free 2R regeneration, and demonstration of improved performance for 10-Gb/s nonreturn-to-zero pseudorandom binary sequence data transmission.
Global attractivity in time-delayed predator-prey systems
Abstract For a predator-prey model with time-delay due to gestation, criteria are obtained for persistence and global attractivity. The global attractivity criteria apply only to models with a decreasing prey isocline.