In fiber-optic communication, an intramodal dispersion, is a category of dispersion that occurs within a single mode optical fiber. This dispersion mechanism is a. UNIT I 1. Explain the intermodal and intramodal dispersion. What are draw back of how can we minimize dispersion? Compare dispersion. Intra-modal dispersion: In single mode optical fiber different colour of light travel at different speed in different material and Hence light will exit at different time for each colour hence causing dispersion. In What is intermodal dispersion?.

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Optical Fiber Communication: Comparison between Intermodal Dispersion & Intramodal dispersion

Different wavelengths of a light pulse that enter intermodaal fiber at one time exit the fiber at different times. Name IT Dr. It arises from infermodal of refractive index of the core material as a function of wavelength.

The two main causes of intramodal dispersion are as follows: The pulse spreads because each mode propagates along the fiber at different speeds. Material dispersion occurs because the spreading of a light pulse is dependent on the wavelengths’ interaction with the refractive index of the fiber core.

Download our mobile app and study on-the-go. Material dispersion is less at longer wavelengths. Problem We want to transmit a Dispdrsion bandwidth digital signal. This page was last edited on 18 Marchat Lunt Homework 25 Chapter 24 Questions 1. Each type of dispersion mechanism leads to pulse spreading. Since modes travel in different directions, some modes travel longer distances.


This condition causes the light pulse to spread. Optical Fiber Characteristics Part I. Material dispersion is a property of glass as a material and will always exist irrespective of the structure of the fiber.

Modal dispersion is the dominant source of dispersion in multimode fibers. Optical Fiber Construction and. Attenuation Introduction to Fiber Optics Summary.

Intramodal dispersion

Modal dispersion occurs because each mode travels a different distance over the same time span, as shown in figure As a pulse dispeersion, energy is overlapped. The amount of waveguide dispersion depends on the structure of the fiber and can be varied by altering the parameters such as NA, core radius etc. Explain the OTDR optical time domain reflectrometry.

The refractive index of GaAs may be takes as 3. When the light pulse enters fiber it is breakdown into small pulses carried by individual modes. Dispersion is the broadening of actual time-width of the pulse due to interjodal properties and imperfections.

Engineering in your pocket Download our mobile app and study on-the-go. Single mode fibers also exhibit the highest possible bandwidth.

Dipsersion Read Edit View history. Therefore, single mode fibers exhibit the lowest amount of total dispersion. The types are intramodal and intermodal dispersion. A typical single mode fiber has a zero-dispersion wavelength of 1. Intramodal dispersion occurs because different colors of light travel through different materials and different waveguide structures at different speeds.


Similar questions Describe Intramodal and intermodal dispersion in optical fibers Marks: Write a short note on measurement of numerical aperture. In silica, the index of refraction is dependent upon wavelength.

Dispersion affect the transmission bandwidth: By using this site, you agree to the Terms of Use and Privacy Policy. Since this phenomenon is wavelength dependent and group velocity is a function of wavelength, it is also called as group velocity dispersion GVD.

UNIT I Explain the intermodal and intramodal dispersion. What are

What are two main budget equations used for link design? The spectral width specifies the range of wavelengths that can propagate in the fiber.

In fiber-optic communicationan intramodal dispersionis a category of dispersion that occurs within a single mode optical fiber. The total dispersion present in single mode fibers may be minimized by trading material and waveguide properties depending on the wavelength of operation. Pulse broadening within a single mode is called as intramodal dispersion or chromatic dispersion. Material dispersion is a function of the source spectral width.