Extremely broad-band semiconductor optical amplifiers

By combining different type of quantum wells, we successfully fabricate broad band optical
amplifiers on InP substrates which can be used at communication wavelength. The gain of
this designed device is measured by two-section technique. These broadband amplifiers can
be used as the gain media of broadband wavelength tunable lasers, also. Using our new
amplifier, the laser can simultaneously provide laser output at eight wavelengths at the
communication band.