Photonic generation of background-free binary and quaternary phase-coded microwave pulses based on vector sum
| Autor: | Jinwang Qian, Yunping Bai, Mingzheng Lei, Zhennan Zheng, Chunqi Song, Shanguo Huang, Xinlu Gao |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
business.industry Pulse generator Phase (waves) 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Multiplexing Atomic and Molecular Physics and Optics 010309 optics Optics Pulse compression 0103 physical sciences Hybrid coupler Photonics 0210 nano-technology business Phase modulation Microwave |
| Zdroj: | Optics express. 27(15) |
| ISSN: | 1094-4087 |
| Popis: | A photonic microwave phase-coded pulse generator is proposed and experimentally demonstrated based on the principle of vector sum. The key component of the proposed pulse generator is an integrated polarization-division multiplexing Mach-Zehnder modulator (PDM-MZM) and a 90° hybrid coupler. By properly setting the data sequences applied to the specially biased PDM-MZM, binary and quaternary phase-coded microwave pulses (PCMPs) that are free from the background signals can be generated. Since no filters and polarization adjustment are involved, the proposed pulse generator is characterized by a simple structure, low-loss, flexible frequency tunability and high long-term stability. The experimental results show that background-free 4 Gb/s Barker and Frank PCMPs at 18 GHz and 2 Gb/s Barker and Frank PCMPs at 24 GHz are successfully generated. The calculated pulse compression ratio and peak-to-side lobe ratio are in good agreement with the theoretical values. |
| Databáze: | OpenAIRE |
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