THE WORKING PRINCIPLE OF OPTICAL AMPLIFIERS AND THEIR TYPES. International Journal of Advance Scientific Research, [S. l.], v. 2, n. 12, p. 140–144, 2022. DOI: 10.37547/ijasr-02-12-20. Disponível em: https://sciencebring.com/index.php/ijasr/article/view/151. Acesso em: 4 may. 2025.