Project supported by the National Key Research and Development Program of China(Grant Nos.2017YFA0205700 and 2015CB932403);the National Natural Science Foundation of China(Grant Nos.11174062,51472057,and 21790364)
Wavelength demultiplexing waveguide couplers have important applications in integrated nanophotonic devices. Two of the most important indicators of the quality of a wavelength demultiplexing coupler are coupling effi...