Broadband optical amplifier

摘要

The invention relates to an optical amplifier comprising : an optical divider for dividing input signal light according to wavelengths, two amplifying sections (1, 2) disposed in parallel and having different wavelength amplification regions for amplifying respective light signals emitted from the optical divider, an optical combiner for combining the light signals output from the respective amplifying sections, and an optical filter disposed in series with at least one of the two amplifying sections for generating a loss in a specific wavelength region.