Optical amplifier and gain tilt compensation method

摘要

The optical amplifier (56A through 56D) realizes EDFA amplification of optical signals in new bands (the S<+>- and S-bands), at wavelengths of 1450 to 1530 nm. The amplifier (56A through 56D) uses multiple erbium-doped fibers (1) to amplify optical signals at wavelengths of 1450 to 1530 nm. Each of the multiple optical filters (2) is interposed between the individual erbium-doped fibers (1). The sum of the transmission characteristics of the multiple filters (2) is identical to an inverted EDF wavelength gain characteristic at wavelengths of 1450 to 1530 nm which is then shifted to the direction that the transmission increases.