PURPOSE: A wavelength-tunable vertical-cavity surface emitting laser device is provided to continuously change an oscillating frequency of an output light within a wide wavelength range as well as to obtain an optimum single longitudinal mode at the same time. CONSTITUTION: A wavelength-tunable vertical-cavity surface emitting laser device includes a substrate(105) formed on a top surface thereof a bottom clad layer(112), an active layer(101) and a top clad layer(111) subsequently. A through hole A is formed at the center of the substrate(105) in such a way that the through hole A penetrates the substrate(105) from the top surface to the bottom surface, thereby exposing the bottom clad layer(112). A bottom electrode(110) is formed on the bottom surface of the substrate(105). A sacrificial layer(103) is formed on the top clad layer(111) and an oxidation layer(102) is inserted into a center portion of the sacrificial layer(103). An aperture B is formed on the center portion of the oxidation layer(102) and a size of the aperture B is controlled by controlling the time of side oxidation. The oxidation layer(102) serves as a current restriction layer for flowing a current through only the aperture B. Therefore, it is suitable for utilizing as an active device in a short optical communication and a large capacity information process of a multi-wavelength transmission.
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