Fig. 1. Schematic of the mode selective coupler for 2×2 ports

Fig. 2. The beam coupling simulation of the mode selective coupler

Fig. 3. Experimental characterization of MWCNTs

Fig. 4. P-scan device and results

Fig. 5. Device diagram of passive Q-switched cylindrical vector beam fiber laser based on few mode fiber

Fig. 6. Pulse characteristics of fiber laser

Fig. 7. Output power and signal-to-noise ratio of fiber laser

Fig. 8. Pattern of angularly polarized and radially polarized beam