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Terahertz and millimeter wave generation scheme based on stimulated Brillouin scattering driven optical frequency comb

ANU SAM1,* , M. GANESH MADHAN1

Affiliation

  1. Department of Electronics Engineering, Madras Institute of Technology, Anna University, Chennai-44, India

Abstract

In this paper, a tunable terahertz wave generation scheme based on Stimulated Brillouin Scattering (SBS) is proposed. This method does not need any pre assigned Radio Frequency signal to activate the modulators. The Brillouin shift frequency (11GHz) with a phase noise of -96dBc/Hz can be generated by utilizing SBS. It serves as the modulating signal for driving the Electro Absorption Modulator (EAM). The deployment of cascaded configuration of EAM compensates the limitation of fixed driving signal. This scheme offers a wideband optical frequency comb (OFC) spectrum of 117 optical carriers with an approximate bandwidth of 1.287THz, in which 41 comb lines have approximately 5dB flatness. Wavelength selective switch (WSS) chooses the desired optical comb lines, 192.858THz and 193.342THz to generate 0.484THz wave with a phase noise of -78dBc/Hz for 10 kHz frequency offset. By varying the selected comb lines, tunability of millimeter and terahertz waves can be achieved..

Keywords

Terahertz, Millimeter waves, Optical frequency comb (OFC), Stimulated Brillouin scattering (SBS), Electro absorption modulator (EAM), Wavelength Selective Switch (WSS).

Submitted at: Nov. 11, 2024
Accepted at: June 4, 2025

Citation

ANU SAM, M. GANESH MADHAN, Terahertz and millimeter wave generation scheme based on stimulated Brillouin scattering driven optical frequency comb, Journal of Optoelectronics and Advanced Materials Vol. 27, Iss. 5-6, pp. 192-199 (2025)