Step index fiber and graded index fiber pdf

Posted on Tuesday, March 16, 2021 12:16:47 PM Posted by Marlon Q. - 16.03.2021 and pdf, edition pdf 2 Comments

step index fiber and graded index fiber pdf

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For an optical fiber , a step-index profile is a refractive index profile characterized by a uniform refractive index within the core and a sharp decrease in refractive index at the core- cladding interface so that the cladding is of a lower refractive index. The step-index profile corresponds to a power-law index profile with the profile parameter approaching infinity. The step-index profile is used in most single-mode fibers [1] and some multimode fibers.

Definition : Graded Index fiber is another type of optical fiber in which the refractive index of the core is non-uniform. This non-uniformity is present because the refractive index is higher at the axis of the core and continuously reduces with the radial movement away from the axis. However, the refractive index of the cladding is constant in the case of graded index fiber.


The characteristics of propagating modes of an optical fibre consisting of a cylindrical core whose refractive index varies arbitrarily with radius, embedded in a homogeneous cladding of infinite outer radius, are studied numerically. It is shown that, to avoid strongly accumulating errors, the numerical solution of the field equations in the core region must be performed by a combination of solution techniques, namely, by step-by-step integration in cylindrical shells where the solution is of oscillatory type, and by a two-point boundary-value technique in shells where the solution is of exponential type. When the core solution is matched at the core boundary to the cladding solution, there results a characteristic equation whose roots specify the effective refractive indices of the propagating modes. A complete theoretical discussion is presented for modes with, as well as without, axial symmetry. However, numerical results are reported here only for axially symmetric modes. This is a preview of subscription content, access via your institution.

Difference Between Step Index Fiber And Graded Index Fiber (With Comparison Chart)

In its simplest form an optical fiber consists of a cylindrical core of silica glass surrounded by a cladding whose refractive index is lower than that of the core. Because of an abrupt index change at the core-cladding interface, such fibers are called step-index fibers. In a different type of fiber, known as graded-index fiber, the refractive index decreases gradually inside the core. This figure shows schematically the index profile and the cross section for the two kinds of fibers. Considerable insight in the guiding properties of optical fibers can be gained by using a ray picture based on geometrical optics. When the two become comparable, it is necessary to use the wave-propagation theory. Because of refraction at the fiber-air interface, the ray bends toward the normal.

Fiberguide Industries manufactures over different specialty optical fibers to meet the needs of our customers. We specialize in optical fibers used for photonics applications, power delivery and sensing, and we also offer data communications fiber. Our high performance coatings enable our fibers to operate at extreme temperatures and survive in harsh environments. Our standard optical fiber offering is detailed below and on the accompanying spec sheets. These fibers can be coated with a variety of polymers or metalized, for extreme temperature performance.

Graded-index Fibers

Show all documents The coating diameter for this fiber is The attenuation is 0.

In optical fiber, a step index fiber is a fiber characterized by a uniform refractive index within the core and a sharp decrease in refractive index at the core-cladding interface so that the cladding is of a lower refractive index. In a step index fiber, the light rays propagate in zig-zag manner inside the core.

Step-index profile

This website uses cookies to deliver some of our products and services as well as for analytics and to provide you a more personalized experience. Click here to learn more. By continuing to use this site, you agree to our use of cookies. We've also updated our Privacy Notice. Click here to see what's new. As a result of fiber imperfections, finite cladding thickness, random bending and other phenomena, there are differences in the attenuation rates of the various modes of an optical fiber. Measurement of this differential mode attenuation can provide insight into the causes of excess loss and can be useful for predicting a fiber's propagation characteristics.

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Graded Index Fiber

Applications and Materials for Graded-index Fibers

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Optical Fiber


  • Note: this box searches only for keywords in the titles of encyclopedia articles. Orva D. - 20.03.2021 at 22:24
  • Classification of Fibers. • Step index fiber- Single mode and Multimode. The refractive index of the core material is constant throughout the length and diameter. Hermenegildo Г. - 21.03.2021 at 03:02