Tan Kang, Shao Jing, Sun Junqiang, Wang Jian
Wuhan National Laboratory for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, China.
Opt Express. 2012 Jan 16;20(2):1184-201. doi: 10.1364/OE.20.001184.
We propose and demonstrate a scheme for optical ultrawideband (UWB) pulse generation by exploiting a half-carrier-suppressed Mach-Zehnder modulator (MZM) and a delay-interferometer- and wavelength-division-multiplexer-based, reconfigurable and multi-channel differentiator (DWRMD). Multi-wavelength, polarity- and shape-switchable UWB pulses of monocycle, doublet, triplet, and quadruplet are experimentally generated simply by tuning two bias voltages to modify the carrier-suppression ratio of MZM and the differential order of DWRMD respectively. The pulse position modulation, pulse shape modulation, pulse amplitude modulation and binary phase-shift keying modulation of UWB pulses can also be conveniently realized with the same scheme structure, which indicates that the hybrid modulation of those four formats can be achieved. Consequently, the proposed approach has potential applications in multi-shape, multi-modulation and multi-access UWB-over-fiber communication systems.
我们提出并演示了一种通过利用半载波抑制马赫-曾德尔调制器（MZM）以及基于延迟干涉仪和波分复用器的可重构多通道微分器（DWRMD）来产生光学超宽带（UWB）脉冲的方案。通过简单地调节两个偏置电压，分别改变MZM的载波抑制比和DWRMD的微分阶数，实验上产生了单周期、双周期、三周期和四周期的多波长、极性和形状可切换的UWB脉冲。利用相同的方案结构还可以方便地实现UWB脉冲的脉冲位置调制、脉冲形状调制、脉冲幅度调制和二进制相移键控调制，这表明可以实现这四种格式的混合调制。因此，所提出的方法在多形状、多调制和多址光纤超宽带通信系统中具有潜在的应用。
