| 摘要 |
PURPOSE:To reduce the effect of axial hole burning by dispersing light intensity distribution concentrated to a phase discontinuous section to phase discontinuous sections in a plurality of optimized quantities at separate positions. CONSTITUTION:The title laser has an N-type InP substrate 6 to which a diffraction grating 7 is formed, an undoped GaInAsP optical waveguide layer 8 shaped to a mesa-striped shape, an active layer 9, a P-type InP clad layer 10 and a P-type GaInAsP ohmic contact layer 11 and a P-type InP layer 12, an N-type InP layer 13, and an undoped GaInAsP cap layer 14 formed on both sides of the mesa stripe. A phase discontinuous section in the diffraction grating 7 is shaped near a reflecting edge face at every size such as 30mum and 50mum from the central section of a resonator. Consequently, light intensity distribution concentrated to one phase discontinuous section is dispersed to phase discontinuous sections in a plurality of, optimized quantities at separate positions, and the distribution of the light intensity can be flattened. Accordingly, a refractive index in a section having large light intensity is reduced, thus minimizing the effect of axial hole burning. |
