G - Physics
02
F
G02F 1/225 (2006.01) G02B 5/18 (2006.01) H01S 3/067 (2006.01) H04B 10/18 (2006.01) H01S 3/10 (2006.01)
Patent
CA 2340558
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 a 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 a optical transmission loss characteristic of the second long-period grating side is located on the longer wavelength side within the transmission band. The waveforms representing the optical transmission loss characteristics of the respective long-period gratings shift depending on the temperature, a loss deviation characteristic of the first long-period grating allows a optical transmission loss value on the shorter wavelength side than the transmission band to increase as the temperature increases so that a large gain deviation characteristic of an optical amplifier is compensated for, a loss deviation characteristic of the second long-period grating compensates for a residual gain deviation characteristic on the longer wavelength side within the transmission band, whereby the temperature dependent gain characteristic of the optical amplifier is compensated for within the transmission band.
Emori Yoshihiro
Mimura Yu
Mizuno Kazuyo
Namiki Shu
Ohta Toshihiko
Freedman & Associates
The Furukawa Electric Co. Ltd.
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