A multiwavelength comb is obtained from Er3+- and Nd3+-doped fiber lasers by incorporation of a section of multimode optical fiber into an otherwise single-mode fiber ring cavity. This combination of fiber types acts as a wavelength-dependent filter in the laser through spatial mode beating between the LP01 and LP11 modes in the multimode fiber.
© 1994 Optical Society of America
Original Manuscript: December 8, 1993
Published: May 15, 1994
Alistair J. Poustie, Paul Harper, and Neil Finlayson, "Multiwavelength fiber laser using a spatial mode beating filter," Opt. Lett. 19, 716-718 (1994)