Integrated Optical Backplane Amplifier

A solution for compensating losses in optical interconnects is provided. Large-core Al₂O₃:Nd³⁺ channel waveguide amplifiers are characterized and tested in combination with passive polymer waveguides. Coupling losses between the two waveguides are investigated in order to optimize the channel geometries of the two waveguide types. A tapered Al₂ O₃:Nd³⁺ waveguide is designed to improve the pump intensity in the active region. A maximum 0.21-dB net gain at a signal wavelength of 880 nm is demonstrated in a structure in which an Al₂O₃:Nd³⁺ waveguide is coupled between two polymer waveguides. The gain can be improved by increasing the pump power and adjusting the waveguide properties of the amplifier.