METHOD AND APPARATUS FOR LIGHT AMPLIFICATION EXHIBITING A FLAT GAIN SPECTRUM

摘要

A semiconductor light amplifier (21) comprises a substrate (1), a semiconductor activation layer (4) formed on the substrate for propagating a light, and amplifying a light propagated through the activation layer which has a wavelength within a predetermined range when a current is applied thereto, an electrode (13) for applying a current to at least a portion of the activation layer, and means (9) for imparting a loss to the light propagated through the activation layer which has a wavelength in a portion of the predetermined wavelength range.