Harith Ahmad, Leela Wanti Lohano, Bilal Nizamani, Muhamad Zharif Samion, Mohamad Faizal Ismail
This study demonstrates the generation of radio frequency (RF) signals with a multiwavelength Brillouin fiber laser (MWBFL) using a gain medium of depressed cladding erbium-doped fiber (DC-EDF). Meanwhile, the dispersion compensated fiber (DCF) is utilized as a nonlinear Brillouin gain medium (BGM). The Brillouin spacing is tuned by adjusting the position of BGM and other components within the laser cavity. Therefore, the single and double spacing between the Brillouin Stokes lines is observed at 0.08 and 0.16 nm. The proposed laser covers an operating range of 14 nm from 1510.30 to 1524.30 nm at single spacing and approximately 10 nm from 1514.30 to 1523.80 nm at double spacing, analyzed by changing the Brillouin pump (BP) wavelength. The beat frequencies are experimentally generated at 10.92 and 21.83 GHz for single and double Brillouin spacing, respectively. To the author's knowledge, this is the first demonstration of using DC-EDF at Brillouin double spacing. Furthermore, the obtained photonic-based RF generation has the potential to evolve 5G systems by considering the switchable carrier frequencies. © 2025
Photonics Research Centre, Universiti Malaya, Kuala Lumpur, 50603, Malaysia; Physics Department, Faculty of Science, Universiti Malaya, Kuala Lumpur, 50603, Malaysia; Universiti Kuala Lumpur British Malaysian Institute (UniKL BMI), Batu 8, Jalan Sungai Pusu, Selangor, 53100, Malaysia; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jalan Semarang 5, Malang, 65145, Indonesia
