Zou Dan, Zheng Xiaoping, Li Shangyuan, Zhang Hanyi, Zhou Bingkun
Opt Lett. 2014 Jul 1;39(13):3954-7. doi: 10.1364/OL.39.003954.
A novel structure consisting of an idler-free microwave photonic mixer integrated with a widely tunable and highly selective microwave photonic filter is presented, which is comprised of a spectrum-sliced broadband optical source, a dual-parallel Mach-Zehnder modulator (DPMZM), and a spatial light amplitude and phase processor (SLAPP). By adjusting the optical phase shift in the DPMZM, the dispersion-induced mixing power fading can be eliminated. By applying a phase processor with the SLAPP, the distortion of the mixing filter brought upon by third-order dispersion is also compensated. Experiments are performed and show that the up/down-conversion signal has a clean spectrum and the mixing filter can be tuned from 12 to 20 GHz without any change to the passband shape. The out-of-band suppression ratio of the mixing filter is more than 40 dB, and the 3 dB bandwidth is 140 MHz.
提出了一种由无惰轮微波光子混频器与宽可调谐且高选择性的微波光子滤波器集成而成的新型结构，该结构由光谱切片宽带光源、双平行马赫-曾德尔调制器（DPMZM）和空间光幅度与相位处理器（SLAPP）组成。通过调整DPMZM中的光相移，可以消除色散引起的混频功率衰落。通过应用带有SLAPP的相位处理器，三阶色散带来的混频滤波器失真也得到了补偿。进行的实验表明，上/下变频信号具有纯净的频谱，并且混频滤波器可以在12至20 GHz范围内调谐，而通带形状无任何变化。混频滤波器的带外抑制比超过40 dB，3 dB带宽为140 MHz。
