Optical connection of optical fibers to grating couplers

An optical coupling between a plurality of optical fibers and a grating coupler, having a design angle, of a photonic integrated circuit (PIC), comprising:

• a stamped optical bench comprising a plurality of stamped structured reflective surfaces each corresponding to a different one of the plurality of optical fibers, wherein each structured reflective surface is an exposed free surface of the optical bench at which incident light is directed, wherein the optical bench supports each optical fiber in optical alignment with respect to the corresponding structured reflective surface, wherein each structured reflective surface turns light transmitted between the grating coupler and the corresponding optical fiber, wherein each optical fiber is a single-mode fiber, and wherein each structured reflective surface includes a reflective surface profile that is structured to reshape the light transmitted between the grating coupler and the corresponding optical fiber to produce a mode field that matches the corresponding optical fiber input/output and the design angle of the grating coupler,
• wherein each structured reflective surface comprises a three-dimensional concave reflective ellipsoidal surface profile, and
• wherein the optical bench further comprises a plurality of fiber alignment structures for aligning each optical fiber to the corresponding structured reflective surface, wherein the plurality of structured reflective surfaces and the fiber alignment structures are integrally/simultaneously formed by precision stamping a malleable metal body.