Calculate the number of modes a step index optical fibre of diameter $40\mu m$ will transmit as its core and cladding refractive indices are 1.5 and 1.46 respectively. Wavelength of light used is $1.5\mu m$.

MONOMODE FIBRE

It supports only one mode of propagation. It has very small core diameter requires laser diode as source of light. Transmission losses are very small . They have higher width. used for very long distance applications. They are by default step index they are mostly made up of …