| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor laser in which fluctuation of optical output can be reduced when the amount of an input current is changed. SOLUTION: This semiconductor laser 10 generates a light at one wavelength in 0.8μm band, 0.9μm band, 1.3μm band and 1.5μm band, and is provided with a semiconductor optical amplifier element (SOA) 20 and an optical fiber 30 arranged so as to be coupled optically with a light output surface 20a of the SOA 20. In the optical fiber 30, a Bragg diffraction grating 32 is formed which constitutes a resonator together with a light reflecting surface 20b of the SOA 20. A full width at half maximumδλB of reflected spectrum of the diffraction grating 32 is at least 6 times and at most 11 times the longitudinal mode intervalδλe of laser determined by the light reflecting surface 20b and the Bragg diffraction grating 32. |
