The Furukawa Electric Co., Ltd.

Shyoichi Ozawa

Shu Namiki

Yuichiro Irie

Osamu Aso

Kazuyo Mizuno

Ikuo Ohta

In an optical gain equalizer according to the present invention, a plurality of etalon filters and one ore more fiber gratings or dielectric multilayer filters are arranged in line, and a beam of light externally applied is passed through the etalon filters and the fiber gratings or dielectric multilayer filters and outputted to the outside, and the etalon filters have sinusoidal wave loss characteristic of the same amplitude and period as those of the term obtained by Fourier series expansion of the loss wavelength characteristic for gain flattening, and the one or more fiber gratings or dielectric multilayer filters compensate the ripple component remaining as the difference between the loss wavelength characteristic for gain flattening and the loss wavelength characteristic owing to the etalon filters . An optical amplifying device is constituted by combining an optical amplifier with the optical gain equalizer . A wavelength-division multiplex transmitter is constituted by using the optical amplifying device

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Tokyo, Japan

Shyoichi Ozawa