Shinya Inagaki

Apparatus for optically connecting a single-mode optical fiber to a multi-mode optical fiber

Wavelength-division-multiplexing optical amplifier

Gain and signal level adjustments of cascaded optical amplifiers

Method and apparatus for controlling optical amplifier used for optically amplifying wavelength-division multiplexed signal

Optical amplification method and device usable with bands other than the C-band

Doped optical fiber having core and clad structure for increasing the amplification band of an optical amplifier using the optical fiber

Apparatus and method of compensating for wavelength dispersion of optical transmission line

Optical fiber cable and manufacture of optical fiber cable

Optical fiber amplifier/multiplexer

Optical amplifier for collectively amplifying optical signals having a plurality of multiplexed wavelengths