Chan Erwin H W
School of Electrical and Information Engineering, and Institute of Photonics and Optical Science, University of Sydney, Sydney, N.S.W., 2006, Australia.
Opt Express. 2012 Oct 8;20(21):22987-96. doi: 10.1364/OE.20.022987.
A tunable, coherence-free, high-resolution microwave photonic bandpass filter, which is compatible to be inserted in a conventional fiber optic link, is presented. It is based on using two cross gain modulation based wavelength converters in a recursive loop. The double cross gain modulation technique solves the semiconductor optical amplifier facet reflection problem in the conventional recursive structure; hence the new microwave photonic signal processor has no coherent interference and no phase-induced intensity noise. It allows arbitrary narrow-linewidth telecommunication-type lasers to be used while enabling stable filter operation to be realized. The filter passband frequency can be tuned by using a wavelength tunable laser and a wavelength dependent time delay component. Experimental results demonstrate robust high-resolution bandpass filter operation with narrow-linewidth sources, no phase-induced intensity noise and a high signal-to-noise ratio performance. Tunable coherence-free operation of the high-resolution bandpass filter is also demonstrated.
本文提出了一种可调谐、无相干、高分辨率的微波光子带通滤波器，该滤波器可兼容插入传统光纤链路中。它基于在递归环路中使用两个基于交叉增益调制的波长转换器。双交叉增益调制技术解决了传统递归结构中的半导体光放大器端面反射问题；因此，新型微波光子信号处理器不存在相干干扰和相位诱导强度噪声。它允许使用任意窄线宽的电信型激光器，同时能够实现稳定的滤波器操作。滤波器的通带频率可通过使用波长可调谐激光器和波长相关的时间延迟组件进行调谐。实验结果表明，该滤波器在窄线宽光源下能稳健地实现高分辨率带通滤波操作，不存在相位诱导强度噪声，且具有高信噪比性能。还展示了高分辨率带通滤波器的可调谐无相干操作。
