Optical millimeter-wave generation via frequency octupling circuit based on two parallel dual-parallel polarization modu
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Optical millimeter‑wave generation via frequency octupling circuit based on two parallel dual‑parallel polarization modulators Ahmed Elsayed Abouelez1 Received: 17 March 2020 / Accepted: 16 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, a filterless optical millimeter-wave (mm-wave) generation by frequency octupling based on two parallel dual-parallel polarization modulators circuit is proposed. From the theoretical analysis, ± 4th order optical sidebands can be generated by proper adjustment of the phases of the radio-frequency (RF) drive signals and polarizer angle. Since there is no need for an optical filter to suppress the optical carrier or unwanted harmonics, the system is suitable for the optical generation of highly stable and tunable mm-waves. Theoretical analysis is verified by computer simulation. From the obtained results, it is shown that the optically generated mm-wave signal from the proposed circuit has a high optical sideband suppression ratio (OSSR) and radio-frequency spurious suppression ratio (RFSSR) for a wide range of modulation index. This range of modulation index extends, theoretically, from 1.8 up to 7.3. For instance, at a modulation index of 5.318, an 80 GHz can be generated from a 10 GHz RF drive signal with an OSSR of 68.4 dB and an RFSSR of 62 dB. Furthermore, the effects of non-ideal system parameters on the OSSR and RFSSR are investigated. Keywords Optical millimeter-wave generation · Frequency octupling · Dual-parallel polarization modulators
1 Introduction Owing to the large bandwidth and the ability to transfer multi-gigabit of data to the customers, millimeter-wave (mm-wave) signals can be considered attractive technology in the modern communication systems such as 5G and radio-over-fiber (RoF). Optical generation techniques of mm-wave signals enjoy several benefits over the conventional electronics techniques; amongst them: less complicated, broad bandwidth, low phase noise, high stability, and wide frequency tunability (Capmany and Novak 2007; Yao 2009) Moreover, the optical generation of mm-wave signals is compatible with RoF
* Ahmed Elsayed Abouelez [email protected] 1
Microwave Engineering Department, Electronics Research Institute (ERI), Cairo, Egypt
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systems. In these systems, a radio-frequency (RF) signal is transmitted over optical fiber for long-distance distribution. Compared with radio-over-coaxial links, RoF enjoys several advantages specifically, low loss, wide bandwidth, and immunity to electromagnetic interference. Several approaches have been proposed for mm-wave generation in the optical domain (Yao 2009). Among these approaches, the external optical modulation is considered as an effective approach owing to its simplicity in mm-wave generation with high spectral purity, high stability, good frequency tunability, low phase noise, and high frequency multiplication factor (FMF). Most of the proposed external optical modulation
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