An optical coupling device , comprising: a first birefringent layer having opposing first and second surfaces , the first birefringent layer configured to: split incident light received at the first surface at a normal angle of incidence with respect to the first surface into first and second beams , the first and second beams having respective polarization orientations that are orthogonal to each other, wherein the first birefringent layer has an optic axis at an angle between 0 and 90 degrees, non-inclusive, with respect to the normal of the first surface, and propagate the first and second beams along respective first and second paths within the first birefringent layer to the second surface, the first and second paths being angled with respect to each other, the first and second beams having a spatial separation at the second surface; and a redirection layer facing the second surface of the first birefringent layer, the first and second beams being parallel to one another after entering the redirection layer and perpendicular to the second surface of the first birefringent layer, the redirection layer including a first grating coupler configured to redirect the first beam within the redirection layer as a third beam along a third path, the redirection layer further comprising a second grating coupler configured to redirect the second beam within the redirection layer as a fourth beam along a fourth path, the third and fourth paths being parallel to the second surface of the first birefringent layer and angled with respect to each other. a first birefringent layer having opposing first and second surfaces , the first birefringent layer configured to: split incident light received at the first surface at a normal angle of incidence with respect to the first surface into first and second beams , the first and second beams having respective polarization orientations that are orthogonal to each other, wherein the first birefringent layer has an optic axis at an angle between 0 and 90 degrees, non-inclusive, with respect to the normal of the first surface, and propagate the first and second beams along respective first and second paths within the first birefringent layer to the second surface, the first and second paths being angled with respect to each other, the first and second beams having a spatial separation at the second surface; and split incident light received at the first surface at a normal angle of incidence with respect to the first surface into first and second beams , the first and second beams having respective polarization orientations that are orthogonal to each other, wherein the first birefringent layer has an optic axis at an angle between 0 and 90 degrees, non-inclusive, with respect to the normal of the first surface, and propagate the first and second beams along respective first and second paths within the first birefringent layer to the second surface, the first and second paths being angled with respect to each other, the first and second beams having a spatial separation at the second surface; and a redirection layer facing the second surface of the first birefringent layer, the first and second beams being parallel to one another after entering the redirection layer and perpendicular to the second surface of the first birefringent layer, the redirection layer including a first grating coupler configured to redirect the first beam within the redirection layer as a third beam along a third path, the redirection layer further comprising a second grating coupler configured to redirect the second beam within the redirection layer as a fourth beam along a fourth path, the third and fourth paths being parallel to the second surface of the first birefringent layer and angled with respect to each other. <EOS>