TY - JOUR AU - Lipkowitz, Steven T. AU - Horton, Timothy U. AU - Murphy, Thomas E. TI - Wideband microwave electro-optic image rejection mixer JO - Optics Letters J2 - Opt. Lett. VL - 44 IS - 19 PY - 2019 DO - 10.1364/OL.44.004710 AB - 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. UR - http://ol.osa.org/abstract.cfm?URI=ol-44-19-4710 KW - Electrooptical modulators Optical delay lines Optical receivers Oscillators Phase modulation Quadrature phase shift keying LB - Lipkowitz_OL_44_4710_2019 ER -