Adjoint-optimized Dual-Layer Grating Couplers for Low-Loss, High-Bandwidth Optical Interconnects. - N. N. Shi; K. F. Chung; J. Tsai; Yannick Augenstein; B. Zhang; Tyler W. Hughes; O. Kuo; E. C. Chen; C. C. Chu; T. H. Wu; S. C. Liu; J. Tung; et al. (OFC, 2026)