Department of Electronic Engineering and Center for Advanced Research in Photonics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong.
Opt Lett. 2011 Jul 15;36(14):2695-7. doi: 10.1364/OL.36.002695.
We propose a scheme to generate ultrawideband (UWB) monocycle pulses using delayed interference of a π/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 ±π/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 ps and the 10 dB fractional bandwidth is 168%.
我们提出了一种使用π/2 相移键控（PSK）信号的延迟干涉来产生超宽带（UWB）单周期脉冲的方案。PSK 信号是通过光相位调制器产生的。基于光纤的延迟干涉仪用于在干涉之前在其两个臂中的信号之间提供延迟以及±π/2 相移。两个相反的相移对应于一对极性反转的 UWB 单周期脉冲的产生。脉冲的半最大值全宽为~68 ps，10 dB 分数带宽为 168%。
