We propose a scheme to generate ultrawideband (UWB) monocycle pulses using delayed interference of a $\pi /2$ phase-shift keying (PSK) signal. The PSK signal is generated with an optical phase modulator. A fiber-based delay interferometer is used to provide the delay together with a $\pm \pi /2$ phase shift between the signals in its two arms before the interference. The two opposite phase shifts correspond to the generation of a pair of polarity-reversed UWB monocycle pulses. The full width at half maximum of the pulses is $~68\mathrm{ps}$ and the $10\mathrm{dB}$ fractional bandwidth is 168%.

© 2011 Optical Society of America

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