Abstract

A novel method, to the best of our knowledge, of frequency upconversion with frequency quadrupling is presented and experimentally demonstrated. The scheme is based on an integrated polarization-division multiplexing dual-parallel Mach–Zehnder modulator (PDM-DPMZM) and an intensity modulator (IM). Polarization-multiplexed second-order sidebands are obtained by properly adjusting the bias voltage of the PDM-DPMZM. By adjusting the polarization controller, the $+2$-order sideband is aligned with the IM’s slow axis to be modulated by the intermediate frequency (IF) signal, and the $-2$-order sideband is aligned with the IM’s fast axis with a much lower modulation efficiency. An upconverted signal with frequency quadrupling is generated at the photodetector. The experiment result shows that the working bandwidth range is 6–40 GHz, the spur suppression ratio of the upconverted signals is 37.5 dB, and the conversion efficiency is $-32\mathrm{dB}$. 100 MSym/s quadrature phase shift keying (QPSK) or a 16QAM signal at 26 GHz is generated using a 6 GHz local oscillator signal and transmitted through 25 km SMF.

© 2019 Optical Society of America

Filter-free image-reject microwave photonic downconverter based on cascaded modulators

Dongjuan Shan, Aijun Wen, Weile Zhai, Xiangrui Li, Wu Zhang, and Zhaoyang Tu
Appl. Opt. 58(13) 3432-3437 (2019)

Tunable 360° microwave photonic multichannel phase shifter with frequency quadrupling

Weilei Wang, Aijun Wen, Zhaoyang Tu, Dong Liang, Mei Chen, Xiaoyan Li, and Jinbo Xiao
Appl. Opt. 57(17) 4751-4755 (2018)

Broadband microwave photonic frequency translator with a wide frequency shifting range

Yuzhi Wang, Hao Chen, and Erwin H. W. Chan
Appl. Opt. 59(35) 11130-11136 (2020)

Filter-free photonics-assisted frequency translator with a tunable phase shift and amplitude based on an integrated DP-QPSK modulator

Yan Li, Muguang Wang, Qi Li, Yuxiao Guo, Beilei Wu, Yan Liu, and Desheng Chen
Appl. Opt. 61(33) 9860-9867 (2022)

Dual-output filter-free microwave photonic single sideband up-converter with high mixing spur suppression

Jiewen Ding, Dan Zhu, Bowen Zhang, and Shilong Pan
Appl. Opt. 60(26) 7888-7893 (2021)