The Critical Fiber Optic Cable · AI Generator #GEN-9A273786
Physics · optics
Problem
A telecommunications engineer is designing a step-index optical fiber with a glass core of refractive index n1=1.52 and a cladding of refractive index n2=1.48. The fiber must be able to guide light when submerged in water (nwater=1.33) for underwater communication cables.
(a) What is the numerical aperture (NA) of this fiber when operated in air (n0=1.00)?
(b) What is the numerical aperture when the fiber is submerged in water?
(c) The fiber cable accidentally gets a crack, exposing the core directly to water over a small section. What is the minimum refractive index the cladding must have to ensure total internal reflection still occurs at the core-cladding interface when water surrounds the core?