$3\mathrm{.}7$ Mini$-$Project: Design of Single$-$Mode Optical Fibers

Project Objectives

Design

The main aim is to design the geometrical and index profiles of silica optical fibers

to meet certain dispersion criteria as required. Furthermore, the performance of a

set of fibers with dispersion as the main factor must be investigated as a function of

the fiber core radius and the relative refractive index difference.

System Applications

Your designed fiber must be incorporated with a dispersion$-$compensated fiber. In

this case, use the SSMF$,$ whose specifications have been given in the lectures. If the

total length of the transmission is $10,000$km specify the length of your designed fiber

and the SMF so that the average fiber dispersion is $0\mathrm{.}01$ps$//$nm$*$km$.$ It can be assumed

that the spacing of optical amplifiers is $100$ km $.$

Design Specifications

A number of types of SMFs are required to be designed for optical communication

systems in long$-$ and short$-$haul transmission. Table $3\mathrm{.}2$ shows the characteristics of

the required fibers. Tables $3\mathrm{.}3$ and $3\mathrm{.}4$ give Sellmeier's coefficients of different mate$-$

rials and doping concentrations so that different refractive indices can be achieved.