| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical semiconductor device capable of stabilizing lateral mode of oscillation light from a semiconductor laser unit and preventing deterioration in frequency characteristics, and a method for manufacturing the same.SOLUTION: A semiconductor laser unit 2 and an optical modulator unit 3 are integrated on an n-InP substrate. The optical modulator unit 3 modulates light emitted from the semiconductor laser unit 2. The semiconductor laser unit 2 includes a vertical ridge 4. The optical modulator unit 3 includes an inverse mesa ridge 5. Changing the ridge type structures of the optical modulator unit 3 and the semiconductor laser unit 2 allows for stabilization of lateral mode of oscillation light from the semiconductor laser unit 2 and prevention of deterioration in frequency characteristics. |
