Summary form only given. With the rapid development of wavelength-division-multiplexed systems in optical communication, multiwavelength laser sources have attracted considerable interest. Several types of multiwavelength rare-earth-doped fiber lasers have been demonstrated, which differ in the wavelength-selection methods used. The wavelength selective elements that have been used in these lasers include a Fabry-Perot etalon, fiber Bragg gratings, a wavelength-division multiplexer, a multimode fiber placed in a single-mode fiber ring cavity, a high birefringence (HiBi) fiber standing cavity, and a HiBi fiber ring cavity. We present a novel multiwavelength erbium-doped fiber laser, in which wavelength selection is achieved with a HiBi fiber loop mirror.