A Photonic-Assisted Method for Generating Duty Ratio Tunable Triangular and Square Microwave Signals

• DOI: 10.1109/jlt.2023.3329988
• Publication Date: 2023-11-03T18:06:21Z
• Authors: Fangping Li; Xiaoyu Chen; Jinfeng Du; Ming Li; Ninghua Zhu; Wei Li
• Keywords: Phase shift module; Duty cycle; Attenuator (electronics); Modulation index; Electro-optic modulator; Modulation (music)

We report a simple photonic-assisted triangular and square microwave waveforms generator with tunable duty ratio by utilizing dual-polarization Mach-Zehnder modulator (DPol-MZM). The RF signal provided the source is split into two paths to drive <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</i> -MZM xmlns:xlink="http://www.w3.org/1999/xlink">y</i> -MZM, respectively. An electrical phase shifter (PS) an attenuator are inserted these branches individually control amplitude of signals applied modulator. By properly adjusting PS direct current biases satisfy specific relationship between different harmonics, varies ratios can be obtained. Our proposed scheme features advantages unfixed modulation index, adjustable repetition rate, ratio. In addition, no extra 90° hybrid coupler optical bandpass filter needed in our system, which brings great convenience realistic applications. theoretically analyzed experimentally verified.