| 摘要 |
Optical waveguide 105 is on a top surface of the photonic chip and has a two ends 116, 118 configured to support two optical modes having a mode centres. A tapered portion of the waveguide has a tapered mesa (610, figure 6) and a tapered central ridge (620, figure 6). A hard stop (710, figure 7) has a flat surface parallel to a portion of the waveguide at the second end of the waveguide. the height of the second mode centre above the flat surface of the hard stop is greater than zero and less than the thickness of the optical waveguide at the second end. An assembly with overlapping photonic chips may be provided (see figure 8a). A polished surface may also be provided coplanar with a facet on the second end 118 of the waveguide. |
