Yukio Michishita

Optical surge preventing method and system for use with or in a rare earth doped fiber circuit

Wavelength division multiplexing optical transmission system and wavelength division multiplexing optical transmission method

Optical transmission path monitoring system, monitoring apparatus therefor and monitoring method therefor

Optical amplifying apparatus capable of detecting at least one of optical individual signals

Light branching apparatus and optical communication system using the same

Optical amplifier for wavelength multiplex transmission

Method and apparatus for wavelength conversion of signal light

Optical amplifier system generating high optical output level

Optical transmission path monitoring system

Optical light conversion communications mechanism