Due to dispersion when the optical pulses travel along the fiber they broaden as shown in (1) Intra-modal or Chromatic dispersion (present in single mode an. Definition of Intramodal Dispersion. Intramodal Dispersion on The Free Dictionary The Timbercon Fiber Optic Glossary continues to expand and improve. There are two different types of dispersion in optical fibers. The types are intramodal and intermodal dispersion. Intramodal, or chromatic, dispersion occurs in all.

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Dispersion is the broadening of actual time-width of the pulse due to material properties and imperfections. As pulse travels down the opticap, dispersion causes pulse spreading.

Intramodal Dispersion

This limits the distance travelled by the pulse and the bit rate fibdr data on optical fiber. Pulse broadening within a single mode is called as intramodal dispersion or chromatic dispersion.

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Since this phenomenon is wavelength dependent and group velocity is a function of wavelength, it is also called as group velocity dispersion GVD. 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. Dispersion caused by multipath propagation of light energy is referred to as intermodal dispersion.

UNIT I Explain the intermodal and intramodal dispersion. What are

Signal degradation occurs due to different values of group delay for each individual mode at a single frequency. In digital transmission, we use light pulse to transmit bit 1 and no pulse for bit 0. When the light pulse enters giber it is breakdown into small pulses carried by individual modes.

At the output individual pulses are recombined and since they are overlapped receiver sees a long pulse causing pulse broadening. While explaining dispersion you mentioned there are three distinct types of distortions but only mentioned two???

Download our mobile app and study on-the-go. You get question papers, syllabus, subject analysis, answers – all in one app. Explain intermodal and intramodal dispersion in optical fibers. How opticsl dispersion affect the transmission B. Similar questions Describe Intramodal and intermodal dispersion in optical fibers Marks: In a fiber three distinct types of distortion are observed: The two main causes of intramodal dispersion are as follows: It is the pulse spreading due to the dispersive properties of material.


It arises from variation of refractive index of the core material as a function of wavelength. Material dispersion is a property of glass as a material and will always exist irrespective of the structure of the fiber.

Dispersion affect the transmission bandwidth: Engineering in your pocket Download our mobile app and inrramodal on-the-go.