In this paper, we study a multiple output fiber-optic storage loop including a semiconductor optical amplifier. Seven wavelength division multiplexing channels can use a common fiber-optical storage loop. Such a fiber-optical storage loop can provide optical signal buffer for asynchronous transfer mode switching systems. The dispersion relation of a multiple quantum well semiconductor optical amplifier is used for designing a wavelength division multiplexing fiber-optical storage loop. Theoretical model of the fiber-optical storage loop is built up. Spectra responses of the wavelength division multiplexing fiber- optical storage loop are studied in this paper.