Acceptance Angle And Numerical Aperture Of Optical Fiber Pdf

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In optics , the numerical aperture NA of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light. By incorporating index of refraction in its definition, NA has the property that it is constant for a beam as it goes from one material to another, provided there is no refractive power at the interface. The exact definition of the term varies slightly between different areas of optics.

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As a light ray passes from one transparent medium to another, it changes direction; this phenomenon is called refraction of light. How much that light ray changes its direction depends on the refractive index of the mediums. Refractive index measures how much a material refracts light. Refractive index of a material, abbreviated as n , is defined as. In , a Dutch physicist named Willebrord Snell derived the relationship between the different angles of light as it passes from one transparent medium to another.

Optical Fiber Tutorial - Optic Fiber - Communication Fiber

Optical fibers are fine transparent glass or plastic fibers which can propagate light. They work under the principle of total internal reflection from diametrically opposite walls. In this way light can be taken anywhere because fibers have enough flexibility. The basic construction of an optic fiber is shown in figure 1. In order to understand the propagation of light through an optical fibre, consider the figure 2. Consider a light ray i entering the core at a point A , travelling through the core until it reaches the core cladding boundary at point B. Total internal reflection occurs only when the angle of incidence is greater than the critical angle.

The light propagates through the fiber only when its angle of incidence at the launching end is less than or equal to a certain value. This maximum possible angle with the axis of the fibre up to which a light ray accepted into the core of the fibre is called acceptance angle. The light rays that enter the fibre beyond acceptance angle refracts into the cladding. The refractive index of the launching medium is n 0. Let us consider a light ray AO enters the fiber making an angle q i with its axis. OB is the refracted ray that makes an angle Theta r with the axis and strikes core-cladding interface at an angle Fi , which is greater than critical angle Fi c. Thus, it undergoes total internal reflection at the interface.

Login Now. The core transmits the optical signal while the cladding guides the light within the core and if the cladding is removed then there is a loss of signal. Find answer to specific questions by searching them here. It's the best way to discover useful content. Download our mobile app and study on-the-go. You'll get subjects, question papers, their solution, syllabus - All in one app. Login You must be logged in to read the answer.

Fiber Optic Basics

Note: this box searches only for keywords in the titles of encyclopedia articles. For full-text searches on the whole website, use our search page. Note: the article keyword search field and some other of the site's functionality would require Javascript, which however is turned off in your browser. The acceptance angle of an optical fiber is defined based on a purely geometrical consideration ray optics : it is the maximum angle of a ray against the fiber axis hitting the fiber core which allows the incident light to be guided by the core. The sine of that acceptable angle assuming an incident ray in air or vacuum is called the numerical aperture , and it is essentially determined by the refractive index contrast between core and cladding of the fiber, assuming that the incident beam comes from air or vacuum:.

Numerical aperture

Definition : Numerical Aperture is the measure of the ability of an optical fiber to collect or confine the incident light ray inside it. It is among the most basic property of optical fiber. Numerical aperture is abbreviated as NA and shows the efficiency with which light is collected inside the fiber in order to get propagated.

Problem 2 We use the same values for n , n 1 and n 2 in the diagram of the optical fiber system above as those used in problem 1. Physics Problems with Solutions.

Fiber Optic Basics

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Fiber optics: Derivation for acceptance angle or numerical aperture
3 Response
  1. Turquesa L.

    2. 2)1/2. In fiber optics, we describe the fiber acceptance angle using. Numerical Aperture (NA): θc αc θa n. 1 n. 2 n a. • We can relate the acceptance angle θa.

  2. Verney M.

    Derivation for Numerical Aperture of Optical Fiber​​ The refractive index of the core is ƞ1 and that of cladding is ƞ2. So, the ray XA is launched from denser medium to rarer medium by making an angle α with the fiber axis. This angle α is known as the acceptance angle of the fiber.

  3. Nathan F.

    Large NA. Figure (a) The acceptance angle 8, of a fiber. Rays within the acceptance cone are guided by total internal reflection. The numerical aperture NA.

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