An optoelectronic structure, comprising: an optoelectronic device, wherein the optoelectronic device comprises an optical alignment waveguide outside an active region of the optoelectronic device, wherein the alignment waveguide includes an input alignment grating coupler and an output alignment grating coupler; and an optical subassembly optically aligned to the optoelectronic device, comprising: a foundation, wherein the foundation comprises a body having a first alignment reflective surface and a second alignment reflective surface, wherein the first alignment reflective surface is configured to be accessible to an external optical source of an optical alignment signal, wherein the first alignment reflective surface reflects the optical alignment signal to the input alignment grating coupler, and the output alignment grating coupler directs the same optical alignment signal to the second alignment reflective surface, and wherein the second alignment reflective surface is accessible to an external optical receiver of the optical alignment signal; and an optical bench subassembly demountably coupled to the foundation, wherein the first alignment reflective surface defines a first optical path that directs the optical alignment signal from the optical source to the input alignment grating coupler of the alignment waveguide on the optoelectronic device, and the second alignment reflective surface defines a second optical path reflecting to the optical receiver the alignment signal directed from the output alignment grating coupler after the alignment signal has been transmitted from the input alignment grating coupler to the output alignment grating coupler through the alignment waveguide, so as to determine an optically aligned position between the foundation and the optoelectronic device. an optoelectronic device, wherein the optoelectronic device comprises an optical alignment waveguide outside an active region of the optoelectronic device, wherein the alignment waveguide includes an input alignment grating coupler and an output alignment grating coupler; and an optical subassembly optically aligned to the optoelectronic device, comprising: a foundation, wherein the foundation comprises a body having a first alignment reflective surface and a second alignment reflective surface, wherein the first alignment reflective surface is configured to be accessible to an external optical source of an optical alignment signal, wherein the first alignment reflective surface reflects the optical alignment signal to the input alignment grating coupler, and the output alignment grating coupler directs the same optical alignment signal to the second alignment reflective surface, and wherein the second alignment reflective surface is accessible to an external optical receiver of the optical alignment signal; and an optical bench subassembly demountably coupled to the foundation, wherein the first alignment reflective surface defines a first optical path that directs the optical alignment signal from the optical source to the input alignment grating coupler of the alignment waveguide on the optoelectronic device, and the second alignment reflective surface defines a second optical path reflecting to the optical receiver the alignment signal directed from the output alignment grating coupler after the alignment signal has been transmitted from the input alignment grating coupler to the output alignment grating coupler through the alignment waveguide, so as to determine an optically aligned position between the foundation and the optoelectronic device. a foundation, wherein the foundation comprises a body having a first alignment reflective surface and a second alignment reflective surface, wherein the first alignment reflective surface is configured to be accessible to an external optical source of an optical alignment signal, wherein the first alignment reflective surface reflects the optical alignment signal to the input alignment grating coupler, and the output alignment grating coupler directs the same optical alignment signal to the second alignment reflective surface, and wherein the second alignment reflective surface is accessible to an external optical receiver of the optical alignment signal; and an optical bench subassembly demountably coupled to the foundation, wherein the first alignment reflective surface defines a first optical path that directs the optical alignment signal from the optical source to the input alignment grating coupler of the alignment waveguide on the optoelectronic device, and the second alignment reflective surface defines a second optical path reflecting to the optical receiver the alignment signal directed from the output alignment grating coupler after the alignment signal has been transmitted from the input alignment grating coupler to the output alignment grating coupler through the alignment waveguide, so as to determine an optically aligned position between the foundation and the optoelectronic device.