Fig. 1. Optical path separated multi-core fibers. (a) Twin-core and three-core fibers. (b) Four-core and seven-core fibers. (c) Central holey multi-elliptic-core fibers.

Fig. 2. Phase array controlled multi-core fibers.

Fig. 3. Optical paths and microfluidic materials channel hybrid integrated fiber.

Fig. 4. Photonic crystal fibers.

Fig. 5. In-fiber integrated optical components based on several fabrication techniques. (a) Fused splicing and tapering of fiber components. (b) Optical fiber end components by polishing. (c) Fused sphere, holey fiber bubble by CO2 laser and groove by 157 nm laser.

Fig. 6. In-fiber integrated coupler technologies.

Fig. 7. Configuration of multi-core fiber fan-out component.

Fig. 8. Eccentric core fiber and three-core fiber Bragg gratings written by a phase mask.

Fig. 9. In-fiber integrated electro-optic intensity modulator.

Fig. 10. Seven-core fiber multi-laser and experimental setup. (a) Lateral UV beams on seven-core fiber. (b) Ray trajectory of UV writing beam exposing all cores without obstruction. (c) Transmission spectrum of each core measured by a scanned laser. (d) Experimental setup for measuring the MC-DFB.

Fig. 11. Optoelectronic photonic crystal fiber with a coaxial semiconductor junction. The junction is composed of several layers of silicon and germanium and is located in a hole adjacent to the fiber core.

Fig. 12. Optofluidic micro system for chemiluminescence reaction monitoring.

Fig. 13. In-fiber integrated accelerometer.

Fig. 14. Integrated micro-optic system for particle trapping and manipulating.

Fig. 15. Hollow-core photonic bandgap fiber photothermal gas sensing system.