Futoshi Izumi

Trunk apparatus of a wavelength-division-multiplexing communication system for controlling a gain of an optical amplifier provided therein

Method of measuring wavelength dispersion amount and optical transmission system

Optical transmission device and wavelength-multiplexed optical transmission system

Dispersion compensating method and dispersion compensating apparatus

Optical transmitter, optical repeater, optical receiver and optical transmission method

Wavelength multiplexing method and an apparatus thereof

Apparatus and method for controlling a wavelength-multiplex optical amplifier

Frame transmitting apparatus and frame receiving apparatus

Wavelength-division multiplex communication system and apparatus

Raman excitation control method and optical transmission system using the same