Figure 6: Device based on the inscription of individual gratings along individual cores.

(a) Schematic of the MCF-based TTDL; (b) Measured optical spectra in reflection for cores 4, 5 and 6 showing the FBGs inscribed.
(a) Schematic of the MCF-based TTDL; (b) Measured optical spectra in reflection for cores 4, 5 and 6 showing the FBGs inscribed.