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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As the length of the fiber increases, modal dispersion increases.

Intramodal dispersion

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 material properties and imperfections. Two plane waves have electric field phasors given by and. However, in single mode fibers, material and waveguide dispersion are interrelated.

Modal dispersion is the dominant source of dispersion in multimode fibers. Engineering in your pocket Download our mobile app and study on-the-go. Explain the intermodal and intramodal dispersion. Estimate the insertion loss at the joint due to the lateral misalignment assuming a uniform distribution of power between all guided modes when a There is a small air gap at the joint b The joint is considered index matched UNIT V 1.

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UNIT I Explain the intermodal and intramodal dispersion. What are

Retrieved from ” https: Explain intermodal and intramodal dispersion in optical fibers. Since modes travel in different directions, some modes travel longer distances.

Explain the time domain inter modal and frequency domain intermodal dispersion measurement with the help of test set up diagram. This page was last edited on 18 Marchat Material dispersion is a function of the source spectral width. Intramodal, or chromatic, dispersion occurs in all types of fibers.

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. In fiber-optic communicationan intramodal dispersionis a category of dispersion that occurs within a single mode optical fiber. Write a short note on measurement of attenuation.

Fiber optics Optics stubs. The pulse spreads because each mode propagates along the fiber at different speeds. Name IT Dr. A typical single mode fiber has a zero-dispersion wavelength of 1.

Each type of dispersion mechanism leads to pulse spreading. Optical Fiber Communication Lecture Views Read Edit View history.

While explaining dispersion you mentioned there are three distinct types of distortions but only mentioned two??? Different wavelengths of a light pulse that enter a fiber interjodal one time intrqmodal the fiber at different times. The second type is waveguide dispersion. Intramodal Dispersion Intramodal, or chromatic, dispersion depends primarily on fiber materials.

Write short note on: This dispersion limits both the bandwidth and the distance over which the information can be transmitted. As pulse travels down the fiber, dispersion causes pulse spreading. Intermodal, or modal, dispersion occurs only in multimode fibers.


The total dispersion present in single mode fibers inttamodal be minimized by trading material and waveguide properties depending on the wavelength of operation. From Wikipedia, the free encyclopedia. This optics-related article is a stub.

Intramodal dispersion – Wikipedia

Intermodal or modal dispersion causes the input light pulse to spread. The two main causes of intramodal dispersion are as follows: This limits the distance travelled by the pulse and the bit rate of data on optical fiber.

Different wavelengths travel at different speeds in the fiber material. The spectral width specifies the range of wavelengths that can propagate in intramodak fiber.

Explain the following terms related to optical laws: The first type is material dispersionn. Material dispersion is less at longer wavelengths. In multimode fibers, waveguide dispersion and material dispersion are basically separate properties. The spreading of the optical pulse as it travels along the fiber limits the information capacity of the fiber.

At the output individual pulses are recombined and since they are overlapped receiver sees a long pulse causing pulse broadening. Therefore different wavelengths will travel down an optical fiber at different velocities. Dispersion affect the transmission bandwidth: In a fiber three distinct types of distortion are observed: Two distinct types of intramodal dispersion are: