Question

A) Calculate the material dispersion effect for LED with line width of 100nm and a laser with a line width of 2nm for a fiber with dispersion coefficient of Dm -22pskm-1nm-1 at 1310nm.

Answer 1

Given,

D_m = 22 pskm-1nm-1 = 22 ps km^-1 nm^-1 at 1310 nm

This is given as per km of length and per nm of spectral line width.

L = 1 km

For the LED,

Δλ1/2 100nm

so, Material dispersion effect per km is-

$\Delta \tau _{1/2}\approx L\left |D _{m} \right |\Delta \lambda _{1/2}$

AT(1km) (22pskm nm-1)(100nm)- 2200ps 2.2ns

For the laser,

1/22nm

so, Material dispersion effect per km is-

$\Delta \tau _{1/2}\approx L\left |D _{m} \right |\Delta \lambda _{1/2}$

AT/(1km) (22pskmnm ( 0.044ns (2nm)-44ps