| 摘要 |
PROBLEM TO BE SOLVED: To provide a resonance grating coupler which couples guided light and spatial light with a short coupling length. SOLUTION: The resonance grating coupler includes a substrate 1 and a waveguide 2 on the substrate, wherein the waveguide 2 includes: a diffraction grating 5 for vertical radiation to couple primary diffracted light with vertical radiation mode light; a preceding DBR 4; a subsequent DBR 7; and a preceding phase adjusting region 4 and a subsequent phase adjusting region 6 respectively formed between the preceding DBR and the diffraction grating 5 for vertical radiation and between the subsequent DBR and the diffraction grating 5 for vertical radiation, and sizes of the DBRs and the phase adjusting regions are determined so as to make both transmission and reflection with respect to the resonance grating coupler be 0 or extremely small values. COPYRIGHT: (C)2010,JPO&INPIT |
