Fig. 1. Schematic of the arc-polisher assembly setup.

Fig. 2. Image of the actual arc-polished fiber fabrication assembly, with an SMF-28 in place and ready for polishing.

Fig. 3. Microscope images of (a) the unpolished SMF-28 fiber and (b) the arc-polished fiber.

Fig. 4. (a) Optical fiber schematic, where a is the core radius, D is the cladding diameter, h is the penetration depth, and R is the cylindrical polisher’s radius. (b) Ray tracing of the side-polished fiber. aeff is the effective mode radius.

Fig. 5. Experimental setup for the dual-wavelength generation.

Fig. 6. Unstable multi-wavelength fiber laser spectra obtained without the presence of the ZnO layer on the side-polished fiber at 2-min intervals.

Fig. 7. ASE transmission spectra of the arc-shaped side-polished fiber with and without the ZnO layer.

Fig. 8. DWFL spectrum.

Fig. 9. DWFL spectra at 2-min time intervals.

Fig. 10. Wavelength stability of the DWFL.

Fig. 11. Peak power stability of the DWFL.