An optical coupling arrangement for coupling light (105; 205; 305) between an integrated optical waveguide (110; 210; 310) and a light source/receiver (120; 220; 320) comprises:
- a substrate (101; 201; 301);
- one or more undercladding layers (102; 202; 302);
- a core layer (103; 203; 303) comprising the integrated optical waveguide (110; 210; 310); and
- one or more overcladding layers (104; 204; 304). The core layer (103; 203; 303) further comprises a focusing grating (130; 230; 330; 430; 530) designed for out-of-plane coupling between the integrated optical waveguide (110; 210; 310) and the light source/receiver (120; 220; 320). This focusing grating (130; 230; 330; 430; 530; 630) comprises an ellipse arc shaped pattern (431-441; 531-541; 631-638) designed to focus the light (105; 205; 305) over a focusing distance of at least 30 microns and at most 300 microns.
