The Furukawa Electric Co., Ltd.

Kazuyo Mizuno

Shu Namiki

Yuichiro Irie

Osamu Aso

Yoshihiro Emori

Yu Mimura

Shigehito Yodo

Toshihiko Ohta

Shoichi Ozawa

Toshiaki Tsuda

Shyoichi Ozawa

Ikuo Ohta

Wavelength multiplex transmission is realized in which the temperature dependency of an EDFA is compensated for in relation to the wavelengths which are used. A first and a second long-period grating which have different periods from each other are formed in an optical fiber, ensuring that the peak wavelength of a waveform representing an optical transmission loss characteristic of the first long-period grating side is located on the shorter wavelength side than a transmission band and a peak wavelength of a waveform representing an optical transmission loss characteristic of the second long-period grating side is located on the longer wavelength side within the transmission band.

Optical component

The present invention effectively compensates gain wavelength dependency of optical amplifiers by a simple method. That is, a value smaller than the minimum value of gain, in the range of usage wavelengths, of gain wavelength dependency data of the optical amplifiers is predetermined as a reference gain value. A loss wavelength characteristic which counterbalances the gain greater than the reference gain value is provided as an ideal loss wavelength characteristic which completely compensates the gain wavelength dependency.

Optical gain equalizer, and method for producing the optical gain equalizer, and applications of the optical gain equalizer

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

Optical gain equalizer, and optical amplifier and wavelength-division multiplex transmitter both comprising the optical gain equalizer

Growing community of inventors

Tokyo, Japan

Kazuyo Mizuno