Giải Bài Tập 2.1 (Trang 42).

Problem 2.1
An optical fiber with a step-index profile with a core diameter of 62.5um, a NA of 0.2 at a wavelength of 1300nm is used for signal distribution and transmission in a local area network.
(a) What is the V parameter of this optical fiber?
(b) How many guided modes would it support? Can you comment on this number regarding the velocities of lightwaves?
(c) Select a cladding diameter. Give reasons for your selection.
(d) Find the maximum acceptance angle of this fiber. Hence, estimate the coupling loss of a laser source with a uniform radiation cone of 30o.