Multimode optical coupler interfaces

An optical system comprising:

• a single mode optical fiber to transmit an optical signal;
• an input multi-mode waveguide to receive the optical signal from the single mode optical fiber;
• one or more single mode output waveguides having adiabatically tapered widths optically coupled with the input multi-mode waveguide, the one or more single mode output waveguides to receive the excited multiple modes caused by fiber misalignment.

A method for manufacturing a multi-mode optical coupler, the method comprising:

• creating a multi-mode silicon (Si) strip waveguide on a silicon dioxide (SiO2) substrate;
• and
• creating a plurality of silicon germanium (SiGe) output waveguides on a face of the Si strip waveguide opposite the SiO2 substrate, wherein the output waveguides have adiabatically tapered widths.

A method for manufacturing a multi-mode optical coupler, the method comprising:

• creating a multi-mode silicon (Si) strip waveguide on a silicon dioxide (SiO2) substrate;
• and
• creating a single silicon germanium (SiGe) output waveguide on a face of the Si strip waveguide opposite the SiO2 substrate, wherein the output waveguides have adiabatically tapered widths.