Microwave Photonic Downconversion Using Phase Modulators in a Sagnac Loop Interferometer
Microwave Photonic Downconversion Using Phase Modulators in a Sagnac Loop Interferometer
复制标题
DOI：
10.1109/jstqe.2013.2263119
复制
发表时间：
2013-05
影响因子：
4.9
通讯作者：
E. Chan;R. Minasian
中科院分区：
文献类型：
--
作者：
E. Chan;R. Minasian
提出了一种新的高转换效率、宽带微波光子下变频器，该下变频器的射频和本振端口之间具有无限隔离，使得射频和本振可以位于不同的位置。它是基于两个行波电光相位调制器内的Sagnac环干涉仪。不需要直流偏置电压，也没有偏置漂移问题。通过Sagnac环路结构固有的光载波抑制获得高转换效率的下变频，这允许高幅度RF和LO边带进入光电检测器。微波光子下变频器拓扑可以使用波分复用技术扩展为具有多个RF信道，其中由RF信号驱动的相位调制器可以位于不同的远程位置。实验结果表明，从5到20 GHz的宽带操作和超过26 dB的转换效率的改善相比，传统的双串联MZM为基础的微波光子下变频器。
A new high conversion efficiency and wideband microwave photonic downconverter with infinite isolation between the RF and LO port, which enables the RF and LO to be located at different locations, is presented. It is based on two traveling wave electrooptic phase modulators inside a Sagnac loop interferometer. No dc bias voltages are required and there are no bias drift issues. High conversion efficiency downconversion is obtained by optical carrier suppression inherent from the Sagnac loop structure, which allows high-amplitude RF and LO sidebands into the photodetector. The microwave photonic downconverter topology can be extended to have multiple RF channels using a wavelength division multiplexing technique in which the phase modulators driven by the RF signals can be located in different remote locations. Experimental results are presented which demonstrate wideband operation from 5 to 20 GHz and over 26 dB conversion efficiency improvement compared to the conventional dual-series MZM-based microwave photonic downconverter.