Fig. 1. Schematic diagram of all-optical wavelength conversion based on FWM.

Fig. 2. (a) Schematic of Ho-doped fiber laser and (b) output spectrum.

Fig. 3. (a) Microscope image of SWCNT-coated microfiber with the magnification of 100x, (b) the change of optical power through the SWCNT-coated fiber when the SWCNT liquid is dropped, and (c) the optical power jitter of the SWCNT-coated microfiber in 2 h.

Fig. 4. Relative characteristics of SWCNT: (a) the Raman shift of the SWCNT, (b) the X-ray diffraction of the SWCNT, (c) the absorption of the SWCNT, and (d) the SEM of the SWCNT under the resolution of 100 nm.

Fig. 5. Schematic of the all-optical wavelength converter.

Fig. 6. Spectrum of the output laser from the 2 µm semiconductor laser.

Fig. 7. (a) Experimental optical spectra of the wavelength conversion signal of the SWCNT-coated microfiber and (b) conversion efficiency as a function of HDFA power.

Fig. 8. (a) Wavelength conversion with different wavelength intervals and (b) wavelength conversion efficiency as a function of wavelength intervals.