A novel photonic generation of power-efficient ultra-wideband (UWB) pulse by combining two asymmetric monocycle
pulses with inverted polarities is experimentally demonstrated. The principle lies in cross-phase modulation (XPM) in a
single semiconductor optical amplifier (SOA) and phase modulation to intensity modulation conversions in an arrayed-waveguide
grating (AWG). The Federal Communications Committee (FCC) compliant UWB pulse gains 24.3 dB and
20.8 dB improvements compared to positive and negative monocycle pulses after power attenuation to respect the FCC
spectral mask, respectively. The generated power-efficient UWB with pulse duration of about 310 ps has potential to
achieve high speed transmission and modulation without overlapping and distortion.
Optical buffer is a key component in all-optical information processing systems. Slow light at room temperature via
four-wave mixing in semiconductor an optical amplifier (SOA) is experimentally investigated. Time delay of 0.4 ns is
achieved for a sinusoidal modulation signal at 0.1GHz, corresponding to a delay-bandwidth product (DBP) of 0.04.
Factors that affect the experimental results are discussed. It is found out that the variable optical delay via four-wave
mixing in SOA can be controlled either electrically by changing the SOA bias, or optically by varying the pump power
or pump-probe detuning.
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