| 摘要 |
PROBLEM TO BE SOLVED: To provide a wavelength variable optical semiconductor device where a laser array, an optical confluence unit, and SOA are integrated, where turbulences generated in the output field pattern of SOA are eliminated, and an optical output coupled to an optical fiber is made uniform independently of a laser channel position. SOLUTION: A DFB laser array 51, an optical confluence unit 53 confluencing the waveguide of the DFB laser array 51, and a semiconductor optical amplifier 54 optically coupled to the optical confluence unit 53, are integrated on the same substrate 41 for the formation of an optical semiconductor device. The semiconductor optical amplifier 54 is provided in parallel with the substrate 41 and at an angle with the end face of the substrate, and a light absorber 46 is provided near the semiconductor optical amplifier 54 at a position where scattered light is liable to appear.
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