4. A multimode fiber has a total pulse spreading of
5.83 ns. The modal pulse spreading is 3 ns.
What is the chromatic pulse spreading for this fiber?
4. A multimode fiber has a total pulse spreading of 5.83 ns. The modal pulse spreading...
The following statement applies to multimode graded-index fibers: a. Multimode graded-index fibers produce less modal pulse distortion than multimode step-index fibers b. Multimode graded-index fibers produce more modal pulse distortion than multimode step-index fibers c. Multimode graded-index fibers produce equal modal pulse distortion than multimode step-index fibers
Explain why a pulse broadens as it travels through a (a) multimode fiber and (b) a single mode fiber?
3. An instantaneous pulse travels through a SM fiber that is 50 Km long. The fiber has a chromatic dispersion of 9 ps/nm-km. The laser source has a spectral width of 0.5 nm. What is the length of the pulse at the end?
4. List one advantage and one disadvantage of a multimode fiber
12 = n* (1 – 21 )] 4. Consider a multimode fiber with core refractive index given by na = n; Let n = 1.5, 4= 0.01, a = 50mm. Calculate: - rnaxla (a) the maximum value of the launch angle & to maintain ... <a: (b) the axial distance at which the ray again crosses the axis. Next, consider a ray crossing the fiber axis at 5 deg with respect to that axis. Find (c) the maximum radial distance...
1. An instantaneous pulse travels through 25 km of MM fiber with a total dispersion of 9ns/km. What is the pulse length at the end of the fiber?
6. A single mode fiber has a material dispersion of 18 ps/nm-km and a waveguide dispersion of -15 ps/nm-km. What is the total chromatic dispersion?
A source has the half-power radiation angle 20° (so that the total emission cone is 40°) as measured from the normal to the emitting surface. Compute the coupling efficiency into a multimode SI fiber having a NA of 0.2.
Please answer 4 question, tks 2.Explain the concept of total internal reflection and how it is important in optical communications. 3.Discuss the differences between single mode, multimode and graded index fibres. 6.What is meant by attenuation in optical fibers? 7.State the two ways in which energy is lost along the length of an optical fiber.
A laser pulse has an energy of 17] and a beam radius of 2 mm. The pulse duration is 5 ns and the energy density is uniformly distributed within the pulse. (a) What is the spatial length of the pulse? 1.5 m (b) What is the energy density within the pulse? 901.878 14 kJ/m3 (c) Find the rms values of the electric and magnetic fields in the pulse. Eo = * MV/m Bo =