Monthly Archives: September 2011

Dispersion in optical fibers

Pulse Dispersion: The broadening or spreading of the output pulse with the time is called pulse dispersion. This can happen due to the different reasons. Let us discuss them one by one: 1. Inter-modal dispersion: The term “Inter-modal” consists of … Continue reading

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Common daily life science queries – 1

Q: Why does a liquid remain hot or cold for a long time inside a thermos flask? Answer: Do you know that thermos flask has double glass wall? The air is trapped in between this double wall of glass. When … Continue reading

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Couplers in optical fibers

Couplers: The devices which are used to distribute light signal from one to many and from many to one optical fiber are called couplers. A few of the types of the couplers are: 1. Biconically Tapered  Directional Couplers: In this … Continue reading

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Connectors in fibers

Dear friends, Last time I have discussed the permanent technique of joining the fibers that is called splicing. Today I will discuss another technique called connectors: Connectors: Connectors are the temporary joints between two or more fibers. These can connected … Continue reading

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Splicers in optical fibers

Do you know how fibers are joined together to pass information? One of the methods is splicing. Let us discuss it: Splicers: Splicers are the permanent joints between two or more fibers. Splicing: Splicing is the technique to join the … Continue reading

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Solitons, optical sources and optical detectors in fibers

Question 1: Define solitons. Answer: A soliton is a pulse or wave that travels along an optical fiber without changing the shape. It is experimentally found that due to fiber non-linearity, the refractive index of the fiber starts depending on … Continue reading

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Why we say that hole has a positive charge?

Dear friends, If we understand the basic theory of the semiconductor, then we know that semiconductors has holes and electrons. But question here arises what are basically holes? Let us discuss: Most of us know that electrons move and the … Continue reading

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V- number or cut off frequency or normalized frequency in optical fibers

V- number or cut off frequency or normalized frequency in optical fibers is equal to V = Пd(Numerical Aperture)/λ Where d is the diameter of the core and λ is the wavelength of light passing through the core of the … Continue reading

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Numerical aperture and acceptance angle

I have discussed about the principle of optical fiber in my earlier articles. Today let us discuss the terms related to fiber: Numerical Aperture (NA): NA is the light gathering ability or capacity of an optical fiber. More the NA. … Continue reading

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Step index and graded index fiber

Mode of the fiber: As we have discussed in the earlier article about the light propagation through an optical fiber after total internal reflection. The path followed by the light in a fiber is called the mode of the fiber. … Continue reading

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