Figure 5: Device based on the inscription of individual gratings in planes of three cores.

(a) Schematic of the MCF-based TTDL device (b) Measured optical spectra in reflection for all the cores showing the FBGs inscribed.

(a) Schematic of the MCF-based TTDL device (b) Measured optical spectra in reflection for all the cores showing the FBGs inscribed.