Figure 5

Evolution of optical power and intensity in the MMF RI sensor for various values of n sm by modification of the critical angle, θcsm , for ncl < nsm < nco . (a) increasing nsm will increase θcsm which reduces the acceptance angle of the propagating beam, (b) power in transversal plane decreases for increasing nsm , and (c) illustrates decreasing optical intensity over different a’ obtained by Equation (14).