Optical amplification in an (InGa)AsP heterostructure in the spectral range 1.3 μ

The spectral dependence of the optical gain was determined for an injecting double heterostructure with a strip active waveguide made of (InGa)AsP. The gain maximum at room temperature corresponded to the wavelength of 1.28 μ. Gain saturation by superradiance in a waveguide of 1.2 mm length was observed when the injection current density was 1.3×10⁴A/cm². The single-trip gain reached 27 dB.