The eigenmode expansion method is applied to discretize the stepped shine grating into a binary shine grating. Various strategies that increase the directionality of the coupling efficiency have been optimized and replicated using this binary shining grating. We discussed and analyzed the impact of distributed Bragg reflectors, slits, and metal reflectors on the coupling efficiency of grating couplers. A metal reflector and slit were included in the design of a binary shine grating coupler. The coupling efficiency from the fiber to the waveguide of vertically incident electrically polarized light is 75.07% at 1600 nm. A 3 dB bandwidth of 77 nm from 1554 to 1631 nm is obtained.