Broadband optical coupling using dispersive elements

An optical dispersion element configured to separate a collimated light into a plurality of light beams and direct each of the plurality of light beams to a respective grating section of a plurality of grating sections of an optical coupling grating at a respective optimum incidence angle, wherein each light beam of the plurality of light beams is diffracted from the optical dispersion element at a different wavelength, and wherein a first light beam of the plurality of light beams is directed to a first grating section of the plurality of grating sections of the optical coupling grating at a first optimum incidence angle based on a first wavelength of the first light beam of the plurality of light beams, the optical dispersion element comprising:

• a diffractive grating configured to separate the collimated light into the plurality of light beams by diffracting the collimated light at a plurality of diffraction angles based on a wavelength of various rays of light in the collimated light,
• wherein the plurality of diffraction angles from the diffractive grating directs the diffracted light beams of the plurality of light beams to the respective sections of the plurality of grating sections, and
• wherein the diffractive grating comprises a transmissive diffractive grating formed on a polished end-face of a gradient-index (GRIN) lens.