Wideband microwave electro-optic image rejection mixer

被引：26
作者：
Lipkowitz, Steven T. [1 ,2 ]
Horton, Timothy U. [2 ]
Murphy, Thomas E. [1 ,2 ]
机构：
[1] Univ Maryland, College Pk, MD 20742 USA
[2] Lab Phys Sci, College Pk, MD 20740 USA
来源：
OPTICS LETTERS | 2019年 / 44卷 / 19期
关键词：
PHASE MODULATION; PHOTONIC MIXER; DOWNCONVERSION;
D O I：
10.1364/OL.44.004710
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We present an electro-optic downconverting mixer with image rejection capabilities. By using a dual-drive Mach-Zehnder modulator (DD-MZM) to modulate an optical carrier with both a signal and a local oscillator, and an asymmetric Mach-Zehnder interferometer (AMZI) to filter the optical spectrum into two separate ports, we generate photocurrents with a phase relationship controlled via direct current (DC) bias voltage applied to the DD-MZM. By choosing these photocurrents to be in quadrature and combining them in a 90-degree electrical hybrid we achieve over 40 dB of image rejection, with a 3 dB bandwidth of approximately 20 GHz limited mainly by the AMZI free spectral range. We demonstrate downconversion of a 1 Gbaud quadrature phase-shift keyed (QPSK) signal even in the presence of a strong interfering image tone. (C) 2019 Optical Society of America
引用
收藏
页码：4710 / 4713
页数：4
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