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Optical ultrawideband monocycle pulse generation based on cross-gain modulation in a semiconductor optical amplifier
Qing Wang1, Fei Zeng, Sebastien Blais
1Microwave Photonics Research Laboratory, School of Information Technology and Engineering, University of Ottawa, Ontario K1N 6N5, Canada.
Abstract:
A novel method for generating ultrawideband (UWB) monocycle pulses based on cross-gain modulation (XGM) in a semiconductor optical amplifier (SOA) is proposed and experimentally demonstrated. Thanks to the XGM in the SOA, a pair of polarity-reversed optical Gaussian pulses is generated at the output of the SOA, to which a Gaussian pulse pump and a continuous-wave probe are applied. The two polarity-reversed optical pulses are then time delayed by two cascaded fiber Bragg gratings to introduce a time delay difference. A UWB monocycle pulse with a full width at half-maximum of 48 ps and a fractional bandwidth of 188% is generated at the output of a high-speed photodetector.
