Abstract
A novel and compact photonic microwave downconverter is proposed and experimentally demonstrated based on an optoelectronic oscillator (OEO) using a single dual-drive Mach-Zehnder modulator (DMZM). The DMZM is used to simultaneously convert the input RF signal into an optical signal, form an OEO for RF carrier extraction, and downconvert the optical RF signal to the baseband. In the experiment, a 2-Gb/s NRZ coded 10.66-GHz RF signal is successfully downconverted to the baseband. In addition, a microwave receiver for wireless high-definition (HD) video transmission is built and verified based on the proposed downconverter. The experiment results confirm that the proposed downconverter has simple configuration, good downconversion performance and very stable operation.
Highlights
Microwave downconverter, which is used to convert a high-frequency RF signal to the baseband or the intermediate frequency (IF) band for further processing, is one of the essential components applied in a variety of applications, such as wireless communication systems, phased-array antennas and electronic warfare systems
A lot of photonic microwave downconverters have been proposed [1,2,3,4,5,6], most of which are realized by two cascaded electro-optic modulators, e.g., a polarization modulator (PolM) followed by a Mach-Zehnder modulator (MZM) [1], two cascaded MZMs [2], and two cascaded phase modulators (PMs) [3]
We propose and experimentally demonstrate a compact photonic microwave downconverter based on an optoelectronic oscillator (OEO) using a single dual-drive MZM (DMZM)
Summary
Microwave downconverter, which is used to convert a high-frequency RF signal to the baseband or the intermediate frequency (IF) band for further processing, is one of the essential components applied in a variety of applications, such as wireless communication systems, phased-array antennas and electronic warfare systems. A microwave downconverter is realized using an electrical mixer, which suffers from the limitations of narrow operation bandwidth, low isolation, severe distortion and low conversion efficiency To overcome these shortcomings, photonic microwave downconversion is proposed and has been demonstrated to be an effective solution with the advantages such as extremely wide. (1) A single modulator is used to simultaneously convert the RF input into an optical signal, form an OEO for RF carrier extraction, and perform the photonic microwave downconversion. This structure is compact with a small size and a low cost. A microwave receiver for the wireless high-definition (HD) video transmission is established based on the proposed downconverter, and a real-time display of the HD video is achieved, which verifies the stable operation of the proposed downconverter
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