Photonics chips with reticle stitching by back-to-back tapered sections

A method comprising:

• forming a first chip region of a photonics chip, wherein the first chip region includes a first waveguide core having a first tapered section;
• and
• forming a second chip region of the photonics chip that adjoins the first chip region of the photonics chip along a first boundary, wherein the second chip region includes a second waveguide core having a second tapered section positioned across the first boundary from the first tapered section, the first tapered section has a first width dimension that increases with increasing distance from the first boundary and, the second tapered section has a second width dimension that increases with increasing distance from the first boundary,
• wherein the first tapered section is laterally offset relative to the second tapered section, the first tapered section has a first longitudinal axis, the second tapered section has a second longitudinal axis that is aligned parallel to the first longitudinal axis, and the first tapered section abuts the second tapered section at the first boundary.