Explain why a pulse broadens as it travels through a (a) multimode fiber and (b) a single mode fiber?
Explain why a pulse broadens as it travels through a (a) multimode fiber and (b) a...
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?
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?
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?
1) What are the material and diameter of the single mode fiber and multi-mode fiber, respectively? 2) Why is it much easier to couple light into a multimode fiber than a single-mode fiber? Then when should we use single-mode fibers instead of multi-mode fibers? 3) To maximize the coupling efficiency, should the NA of the lens be greater or smaller than that of the fiber? why? 6) What is fluorescence? What is two-photon absorption? What is two-photon excitation fluorescence microscopy?
A fiber which is referred as non-dispersive shifted fiber is a. Coaxial cables b. Standard single mode fibers c. Standard multimode fibers d. Non zero dispersion shifted fibers
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
1. A fiber that supports many optical wavegui modes 2. Ration of the speed of light in free space to its speed in a given material 3. Light extending from 680 nm up to the wavelenghts of the microwaves 3 Matching questions A. Stretching of received pulse width because of multiple paths taken by the light Graded-index Fiber 2Single-Mode Fiber B. Fiber cables with core diameters of about 7-10 um light follows a single path 3. Pulse Dispersion C. the...
The fibers mostly not used nowadays for optical fiber communication system are a. Single mode fibers b. Multimode step fibers c. Coaxial cables d. Multimode graded index fibers
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...
Explain why you can't calculate the velocity of sound by taking a single measurement and dividing the time of flight into the total distance the sound pulse travels (as measured with the metre stick). (Hint: Can you assume that the line on the graph should pass through the origin? Why or why not?)