A Microwave Photonic Mixer Using a Frequency-Doubled Local Oscillator

IEEE Photonics Journal

Yunxin Wang¹  Feng Yang¹  Dengcai Yang¹  Jingnan Li¹  Lu Rong¹  Jiahao Xu¹  Dayong Wang¹  Tao Zhou²  Xin Zhong² 

[1] College of Applied Sciences, Beijing University of Technology, Beijing, China;Science and Technology on Electronic Information Control Laboratory, Chengdu, China;

关键词: Fiber optics links and subsystems;    radio frequency photonics;    analog optical signal processing.;   

DOI  :  10.1109/JPHOT.2018.2838587

来源: DOAJ

【 摘 要 】

A microwave photonic mixer based on a frequency-doubled local oscillator (LO) is proposed. The carrier-suppressed single-sideband (CS-SSB) modulation of the -first-order radio frequency (RF) and ±second-order LO sidebands can be generated by using a dual-polarization dual-parallel Mach-Zehnder modulator (DP-DPMZM), an electrical 90° hybrid coupler, and an optical bandpass filter. The upconverted intermediate frequency (IF) signal with the frequency of ω_RF + 2ω_LO is output by frequency beat at a photodetector. Meanwhile, the -first-order RF sideband can be easily changed to +first-order RF sideband by adjusting one dc bias voltage of the DP-DPMZM. The downconverted IF signal with the frequency of ω_RF 2ω_LO is obtained correspondingly. The experimental results show that the spur suppression ratios of upconverted and downconverted IF signal are 19.0 dB and 25.5 dB, respectively. The spurious-free dynamic range of the proposed mixer is 96.5 dB·Hz^2/3. The output electrical spectrums are pure owing to the optimal design of the CS-SSB modulation. The proposed mixer reduces the frequency requirement of LO signal since the second-order LO single sideband is used, and the upconversion and downconversion can be switched to each other by a simple electrical operation.

【 授权许可】

Unknown