Fig. 1. (a) Structure diagram of uncoated optical fibers embedding; (b) Structure diagram of coated optical fibers embedding

Fig. 2. The global view of meshing of coated optical fibers embedding in flexible substrate

Fig. 3. Lamination process of circuit board

Fig. 4. Curves of lamination process

Fig. 5. (a) Stress distribution of uncoated optical fibers; (b) Stress distribution of coated optical fibers; (c) Stress distribution of coatings

Fig. 6. The influence of the thickness of the middle PI layer on optical fibers stress

Fig. 7. The influence of thickness of optical fiber bottom filler on optical fibers stress

Fig. 8. Cross-section diagram of optical fiber positioning groove

Fig. 9. (a) Physical picture of FEOPCB; (b) Cross-section diagram of FEOPCB

Fig. 10. Measurement diagram of buried optical fiber offset

Fig. 11. Bending fatigue test of FEOPCB

Fig. 12. Cross-section diagram of FEOPCB bending area

Fig. 13. Schematic diagram of bending loss test

Fig. 14. Bending loss versus curvature radius

Fig. 15. Crosstalk test diagram of adjacent optical fibers

Fig. 16. Schematic diagram of high-speed signal transmission performance test for FEOPCB

Fig. 17. Physical picture of high-speed signal transmission performance test for FEOPCB