A semiconductor laser capable of realizing a regular single mode output and achieving a high gain and high output as well as improving the COD level and the spatial hole burning and not causing a mode conversion loss in principle is provided. The semiconductor laser has a single mode waveguide and a...http://www.google.de/patents/US6768758?utm_source=gb-gplus-sharePatent US6768758 - Semiconductor laser, semiconductor optical amplifier, and production method thereof
