Ukrainian Journal of Physical Optics


2024 Volume 25, Issue 1


ISSN 1609-1833 (Print)

A NEW FILTERLESS W-BAND MILLIMETER WAVE SIGNALS GENERATION SCHEME WITH FREQUENCY OCTUPLING BASED ON CASCADED MACH–ZEHNDER MODULATORS

1,2,3,*Dongfei Wang, 4,5Yu Zhang, 1Zufang Yang, 1Lan Zhang, 1Baohong Wu, 2Xiaokun Yang, 6Shuxia Yan and 1,7Xiangqing Wang

1School of Artificial Intelligence, Wuhan Technology and Business University, Wuhan, 430065, China, wdfchina@126.com
2School of Electronics and Information, Nanchang Institute of Technology, Nanchang, Jiangxi Province, 330044, China
3School of Information Engineering, Beijing Institute of Graphic Communication, Beijing 102600 China
4Jincheng Research Institute of Opto-mechatronics Industry, Jincheng 048000, China
5Shanxi Key Laboratory of Advanced Semiconductor Optoelectronic Devices and Integrated Systems, Jincheng 048000, China
6Tianjin Key Laboratory of Optoelectronic Detection Technology and System, Tianjin 300387 China
7Henan Key Laboratory of Visible Light Communications, Zhengzhou, China
*wdfchina@126.com

ABSTRACT

The existing frequency bands, such as the C-band and L-band, are becoming increasingly crowded and cannot meet the growing demand for high-speed data rate services. To overcome spectrum congestion, meet future business needs, and overcome the bottlenecks of traditional electronic methods, we have modified an approach for generating W-band mm-wave signals with octupling frequency without the need for an optical filter. One integrated modulator consisting of two push-pull Mach–Zehnder modulators (MZM) in series is employed to achieve W-band signal generation. The octupling frequency signal generation depends on ±4th optical sidebands to beat frequency in the photodetector. For capturing ±4th optical sidebands, the bias point of the two push-pull MZMs needs work at the peak point, and the modulation index of the two MZMs should be simultaneously set to 2.4. We have conducted detailed mathematical derivation and computer simulation for the scheme, demonstrating its correctness. The results show that the optical sideband suppression ratio is not less than 45.73 dB, and the RF sideband suppression ratio can reach 37.64 dB.

Keywords: W-band, mm-wave signal generation, frequency octupling, Mach-Zehnder modulator

UDC: 535.8

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    Існуючі діапазони частот, такі як C-діапазон і L-діапазон, стають все більш переповненими і не можуть задовольнити зростаючий попит на високошвидкісні послуги передачі даних. Щоб подолати перевантаження спектру та задовольнити майбутні потреби, а також подолати вузькі місця традиційних електронних методів, ми модифікували підхід для генерації сигналів мм-хвиль W-діапазону з восьмикратним збільшенням частоти без використання оптичного фільтра. Для генерації сигналу W-діапазону використовується один вбудований модулятор, що складається з двох послідовно з’єднаних двотактних модуляторів Маха-Цендера (ММЦ). Генерація сигналу з восьмикратним помноженням частоти залежить від ±4 оптичних бічних смуг і смуги частот биття фотодетектора. Для захоплення ±4-ї оптичної бічної смуги точка зміщення двох двотактних ММЦ повинна відповідати піковій точці, а індекс модуляції двох МMЦ має бути одночасно встановлений на 2,4. Ми провели детальний математичний аналіз та комп’ютерне моделювання запропонованої схеми і продемонстрували її коректність. Показано, що коефіцієнт оптичного пригнічення бокової смуги становить не менше 45,73 дБ, а коефіцієнт пригнічення бокової радіочастотної смуги може досягати 37,64 дБ.

    Ключові слова: W-діапазон, генерація сигналу міліметрового діапазону, восьмикратне збільшення частоти, модулятор Маха–Цендера

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