Fig. 1. Multicore fiber architecture and transmission test spectra. (a) Schematic of MCF fusion structure; (b) sectional view of MCF; (c) cone-shaped MCF under 1000× CCD lens; (d) spectra of untaper and taper MCFs at room temperature

Fig. 2. Supermode interference and mode field distribution in multicore fiber. (a) Transmission spectrum of the sensor; (b) light intensity distribution of weakly coupled MCF; (c) light intensity distribution of strongly coupled MCF; (d) simulated MCF supermode interference plane; (e) simulated MCF supermode interference cross-section

Fig. 3. MCF temperature sensor system

Fig. 4. Temperature sensing characteristic. (a) Transmission spectra of MCF temperature sensor at different temperatures; (b) relationship between wavelength of transmission spectrum and temperature