title: All-optical, ultra-wideband microwave I/Q mixer and image-reject frequency down-converter.
abstract: An all-optical and ultra-wideband microwave in-phase/quadrature (I/Q) mixer, based on a dual-parallel Mach-Zehnder modulator and a wavelength division multiplexer, is proposed. Due to the simultaneous frequency down-conversion and 360-deg tunable phase shifting in the optical domain, the proposed I/Q mixer has the advantages of high conversion gain and excellent quadrature phase balance (<±1.3 deg⁡) with a wide operating frequency from 10 to 40 GHz. Assisted by an analog or digital intermediate-frequency quadrature coupler, an image-reject frequency down-converter is then implemented, with an image rejection exceeding 50 dB over the working band.
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Gao
authors.forename: Aijun
authors.initials: A
authors.lastname: Wen
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Li