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High-Performance Acousto-Optic Modulators for Improving the Recognition Accuracy of Weak Microwave Signals by Radio Frequency Identification Systems

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Názov: High-Performance Acousto-Optic Modulators for Improving the Recognition Accuracy of Weak Microwave Signals by Radio Frequency Identification Systems
Autori: Weijia Zhang, Xueting Luo, Qiancheng Rao, Peng Jiang
Zdroj: Electronics ; Volume 14 ; Issue 4 ; Pages: 658
Informácie o vydavateľovi: Multidisciplinary Digital Publishing Institute
Rok vydania: 2025
Zbierka: MDPI Open Access Publishing
Predmety: RFID, IDT, FEUDT, acousto-optic modulator, drive power, diffraction efficiency
Popis: By leveraging the high sensitivity of acousto-optic modulators to microwave signals, their integration into RFID systems can significantly improve the detection of faint microwave signals. Traditional acousto-optic modulators, which use bidirectional uniform comb transducers (IDTs), suffer from a 50% microwave signal loss due to the diffraction efficiency being less than 50%, complicating the accurate identification of already weak signals. This paper presents a solution to the 50% loss issue by replacing the IDT with a floating electrode unidirectional transducer (FEUDT), a key structure in detecting microwave signals. The resulting samples exhibited an optical waveguide insertion loss of 8.73 dB, a mode field diameter of 6.48 μm, an operating frequency of 141.2 MHz, and a diffraction efficiency of 61.72%, and required only 0.57 W of driving power. Comparative empirical tests with traditional transducers under identical conditions demonstrated that the FEUDT-based acousto-optic modulator surpassed the 50% diffraction efficiency limit of conventional modulators, which facilitated the detection of weak microwave signals.
Druh dokumentu: text
Popis súboru: application/pdf
Jazyk: English
Relation: Computer Science & Engineering; https://dx.doi.org/10.3390/electronics14040658
DOI: 10.3390/electronics14040658
Dostupnosť: https://doi.org/10.3390/electronics14040658
Rights: https://creativecommons.org/licenses/by/4.0/
Prístupové číslo: edsbas.F6A59E5A
Databáza: BASE
Popis
Abstrakt:By leveraging the high sensitivity of acousto-optic modulators to microwave signals, their integration into RFID systems can significantly improve the detection of faint microwave signals. Traditional acousto-optic modulators, which use bidirectional uniform comb transducers (IDTs), suffer from a 50% microwave signal loss due to the diffraction efficiency being less than 50%, complicating the accurate identification of already weak signals. This paper presents a solution to the 50% loss issue by replacing the IDT with a floating electrode unidirectional transducer (FEUDT), a key structure in detecting microwave signals. The resulting samples exhibited an optical waveguide insertion loss of 8.73 dB, a mode field diameter of 6.48 μm, an operating frequency of 141.2 MHz, and a diffraction efficiency of 61.72%, and required only 0.57 W of driving power. Comparative empirical tests with traditional transducers under identical conditions demonstrated that the FEUDT-based acousto-optic modulator surpassed the 50% diffraction efficiency limit of conventional modulators, which facilitated the detection of weak microwave signals.
DOI:10.3390/electronics14040658