Robuta

https://nrc-publications.canada.ca/eng/view/object/?id=c2e94536-3e1e-4e29-9baf-47961f34fd2c Arrayed waveguide grating based on group index modification - NRC Publications Archive - Canada.ca Arrayed waveguide grating based on group index modification arrayed waveguide gratingbased ongroup indexmodificationnrc