| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus including a waveguide input coupler, a tapered branch waveguide, and a waveguide adaptor physically connected to a waveguide input coupler proximal end and to a branch waveguide proximal end.SOLUTION: A waveguide input coupler 220 includes a distal end 222 having a distal end width Wand a proximal end 224 having a proximal end width W. A tapered branch waveguide 230 includes a distal end 232 having a distal end width Wand a proximal end 234 having a proximal end width W22. The branch waveguide distal end width Wis greater than the branch waveguide proximal end width W. The waveguide input coupler 220, the branch waveguide 230 and a waveguide adapter 240 are configured to convert input light having a base transverse waveguide mode to output light having a higher-order waveguide mode. |
