| 摘要 |
The present invention provides a wavelength-tunable laser apparatus which is capable of obtaining a high output while suppressing the generation of spontaneous emission, as well as having a broad wavelength-tunable range. In particular, the apparatus includes a distributed reflector section which comprises a first active layer for oscillating light, a first grating for filtering the light generated in the first active layer, and upper and lower clad layers between which the first active layer and the first grating are interposed; a gain section which is formed adjoining to a side of the distributed reflector section and comprises a second active layer disposed between the upper and lower clad layers for adjusting the gain of the light; and a gain-clamped semiconductor optical amplifier section formed adjoining to a side of the gain section, wherein the gain-clamped semiconductor optical amplifier section comprises a third active layer disposed between the upper and lower clad layers for amplifying the light to have a clamped gain and a second grating for filtering the light passing through the third active layer.
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