Optical fiber connection navigation system using visible light communication in central office
An optimized optical-fiber-connection system for central offices is described. This system employs visible-light communication to reduce costs while maintaining the functions and usability of an earlier system. Little skill is needed to realize optical-fiber connection.
Broadband access in Japan: rapidly growing FTTH market
This article describes the latest FTTH technologies and market developments in Japan today. It focuses in particular on FTTH services, the deployment of FTTH systems, and lessons learned from actual deployments. The article also discusses the key R&D issues that must be completed if we are to enter the full-scale FTTH era.
Suppressed Light Emission of the Reaction Zone in Detonation
THE detonation of high explosives in water can be photographed with an open camera and a flash light as the explosive gases do not emit light. The method has been used1 to investigate the spread of shock waves and explosive gases, and to investigate the initiation by shock waves2. We have found that it can be used also in certain gases such as butane and propane. The method is not suitable, on the other hand, for explosives with two levels of detonation velocity in the case of low velocity. A great part of the reaction then occurs after the reaction zone has passed and the expanding explosive gases are very luminous even in water.