Recent progress in WDM laser diodes and integrated light sources

摘要

Recent progress in WDM LDs is summarized. Sophisticated devices such as widely tunable LDs are very much expected to exploit the possibility of WDM systems. On the other hand, simple DFB LD is still regarded as the most established device for practical system use. Further research and development on WDM LDs is required for the continuously upgrading WDM system.