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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Similar questions Describe Intramodal and intermodal dispersion in optical fibers Marks: The first type is material dispersion. In multimode fibers, waveguide dispersion and material dispersion are basically separate properties.

Waveguide dispersion is usually neglected.

UNIT I Explain the intermodal and intramodal dispersion. What are

disperskon The two main causes of intramodal dispersion are as follows: Dispersion is the broadening of actual time-width of the pulse due to material properties and imperfections. Different wavelengths travel at different speeds in the fiber material. Pulse broadening within a single mode is called as intramodal dispersion or chromatic dispersion.

The spectral width specifies the range of wavelengths that can propagate in the fiber.

Write a short note on measurement of refractive index profile. Material dispersion is a property of glass as a material and will always exist irrespective of the structure of the fiber.


This condition is shown in figure This dispersion limits both the bandwidth and the distance over which the information can be transmitted. The spreading of the optical pulse as it travels along the fiber limits the information capacity of the fiber.

The refractive index of GaAs may be takes as 3. 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. Name IT Dr. In eispersion communicationan intramodal dispersionis a category of dispersion that occurs within a single mode optical fiber.

At the output individual pulses are recombined and since they are overlapped receiver sees a long pulse causing pulse broadening. Material dispersion is less at longer wavelengths. Modal dispersion is the dominant source of dispersion in multimode fibers.

You can help Wikipedia by expanding it. The total dispersion present in single mode fibers may be minimized by trading material and waveguide properties depending on the wavelength of operation.

What is this condition called? Explain the OTDR intermkdal time domain reflectrometry. Dispersion caused by multipath propagation of light energy is referred to as intermodal dispersion. Compare dispersion shifted and dispersion flattened fiber. Views Read Edit View history.

Intramodal dispersion

From Wikipedia, the free encyclopedia. The types are intramodal and intermodal dispersion.


The modes of a light pulse that enter the fiber at one time exit the fiber a different times. Intrrmodal silica, the index of refraction is dependent upon wavelength.

Write short note on: In digital transmission, we use light pulse to transmit bit 1 and no pulse for bit 0. Two distinct types of intramodal dispersion are: Explain the link design for optical communication system.

Intramodal Dispersion Intramodal, or chromatic, dispersion depends primarily on inhramodal materials. Write a short note on measurement of numerical aperture. Problem We want to transmit a MHz bandwidth digital signal.

Intermodal or modal dispersion causes the input light pulse to spread. As the modes propagate along the fiber, light energy distributed among the modes is delayed by different amounts. Single mode fibers propagate only the fundamental mode.

UNIT I Explain the intermodal and intramodal dispersion. What are

Since modes travel in different directions, some modes travel longer distances. A typical single mode fiber has a zero-dispersion wavelength of 1.

Modal dispersion occurs because each mode travels a different distance over the same time span, as shown in figure The second type is waveguide dispersion. Therefore, single mode fibers exhibit the lowest amount of total dispersion.