| 摘要 |
Traveling-wave type light amplifier having a waveguide region, both end portions of which are tapered such that the tip of each end has a width and a thickness which are equal to each other. Due to the shape of an end portion of the waveguide region, the output light of the amplifier hardly depends on two linearly polarized wave components. Hence, the near-field pattern of the light-emitting point and the far-field pattern of the output beam are of rotation symmetry. Thus, the light amplifier can be optically coupled to an optical fiber with high efficiency. In addition, since the center portion of the waveguide region has a uniform width, just like the waveguide of the conventional light amplifier, device characteristics such as a current density are not changed.
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