“…Nowadays,multi-wavelength fiber-optic lasers are essential for many different applications of fiber communication systems: in optical testing, fiber sensors, radio-frequency photonics [1][2][3][4], etc. Moreover, several fiber laser resonators for multiwavelength lasing use have been proposed and studied: the Fox-Smith cavity, linear cavity, dual Sagnac loop, ring cavity, compound-ring cavity [5][6][7][8][9], etc. Furthermore, there have been studies of methods involving the use of several different gain media in fiber cavities, such as utilizing erbium doped fiber amplifiers (EDFA), semiconductor optical amplifiers (SOA), reflective semiconductor optical amplifiers (RSOA), stimulated Raman scattering, stimulated Brillouin scattering, and reflective semiconductor optical amplifiers (RSOA), and of combinations of these methods [10][11][12][13][14][15].…”