Fig. 1. Schematic of MCFL composition.

Fig. 2. (a) Schematic of the experiment setup for measurement of salinity, temperature, and depth in seawater. (b) The salinity measuring experimental setup and the optical microscopic image of the MCFL (Inset). (c) The temperature measuring experimental setup. (d) The depth measuring experimental setup and the optical microscopic image of the MCFL (Inset).

Fig. 3. Transmission spectra at different salinities.

Fig. 4. Relationships between the characteristic wavelengths and the salinities.

Fig. 5. Transmission spectra at different temperatures.

Fig. 6. Relationships between the characteristic wavelengths and the temperatures.

Fig. 7. Transmission spectra at different pressures.

Fig. 8. Relationships between the characteristic wavelengths and the pressures.