Optical Fiber Communication

Optical Isolator

Definition: An optical component that permits the propagation of the light signal in one direction only and completely blocking the other direction is known as Optical Isolator. Faraday effect is the basis of working of this device. Basically, when a light ray is allowed to pass through the fiber then there are some chances that …

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Optical Modulation

Definition: Optical Modulation is the process by which a light wave is modulated (modified) according to a high-frequency electrical signal that contains information. These modified light waves are then transmitted either by a transparent medium or through an optical fiber cable. More specifically, we can say that it is the process by which an electrical …

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Optical Line Terminal (OLT)

Definition: Optical Line Terminal or optical line termination is a device that basically acts as a part of a passive optical network (PON). It is present in the central office of the network and manages the transmission and reception of information across the overall network. Optical line terminal is abbreviated as OLT. OLT do so …

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Dispersion in Optical Fiber

Definition: The term dispersion is widely used when we talk about travelling of light pulse, more specifically we can say light-wave transmission. Dispersion in an optical fiber is the spreading of light pulses when the wave travels through an optical fiber from an end to another. It results in some variation of the actually transmitted …

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Total Internal Reflection (TIR)

Definition: When a light ray travels from a denser medium to a rarer medium, with an angle of light incidence more as compared to a critical angle then the incident ray gets reflected back to the same medium. This phenomenon is called Total Internal Reflection. It is abbreviated as TIR. Now the question arises why …

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Graded Index Fiber

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 …

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Nd:YAG Laser

Definition: Nd:YAG laser is the short form used for Neodymium-doped Yttrium Aluminium Garnet. It is a solid state and 4 level system as it consists of 4 energy levels. Nd ion is rare earth metal and it is doped with solid state host crystal like yttrium aluminium garnet (YAG – Y3Al5O12) to form Nd:YAG laser. …

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Optical Network

Definition: An Optical Network is basically a communication network used for the exchange of information through an optical fiber cable between one end to another. It is one of the quickest networks used for data communication. As we already know that data signal through an optical fiber is transmitted in the form of light pulses. …

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Rayleigh Scattering

Definition: Rayleigh scattering is the phenomena of scattering of light particles majorly by the molecules of gas (sometimes also by solid and liquid). This scattering of light was first noticed by Lord Rayleigh in 1871 and thus named so. Basically when electromagnetic light propagates through air, then the back and forth movement of electrons inside the …

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