Optical connector system and optical connection structure

An optical connection structure comprising:

• an optical path-changing device comprising:
• a fiber-holding part that holds a single-mode optical fiber along a first direction;
• and
• a reflection surface that reflects an optical signal;
• a substrate that comprises a grating coupler for inputting/outputting an optical signal in a second direction that is inclined with respect to a direction perpendicular to a surface of the substrate;
• and
• a relay device on the substrate, wherein
• the optical path-changing device and the relay device each have an input/output surface to/from which an optical signal is inputted/outputted,
• a first convex lens is disposed on the input/output surface of the optical path-changing device,
• a second convex lens is disposed on the input/output surface of the relay device, and
• the single-mode optical fiber is optically coupled to the grating coupler by
• inputting/outputting collimated light of the optical signal between the first convex lens and the second convex lens and
• changing a direction of the optical signal by the reflection surface of the optical path-changing device.