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15 Mar 2010 21:16:56 IST

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How we use optic fibers?

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How we use optic fibers?

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Kaushal agrawal

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15 Mar 2010 21:42:38 IST

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There are two types of fiber optic cable that allow the light to travel along it in different ways. Today we use “single mode” fiber that allows the light to follow only one optical path. This makes it possible to transmit much more information over much longer distances.

Aditya Arora

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15 Mar 2010 22:05:18 IST

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Hi,

Well, optical fibres are of 2 types....

Type 1 : single mode

In this, thr r 2 layers of optical fibre with outer having lower refractive index..... THTS FUIGURE 1

Type 2 : multi mode

In this, ther r no layers, the refractive index decreases progressively as a fucntion of distance frm the central axis.

edison

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15 Mar 2010 23:15:19 IST

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Optical fiber is used by many telecommunications companies to transmit telephone signals, Internet communication, and cable television signals. Due to much lower attenuation and interference, optical fiber has large advantages over existing copper wire in long-distance and high-demand applications. However, infrastructure development within cities was relatively difficult and time-consuming, and fiber-optic systems were complex and expensive to install and operate. Due to these difficulties, fiber-optic communication systems have primarily been installed in long-distance applications, where they can be used to their full transmission capacity, offsetting the increased cost. Since 2000, the prices for fiber-optic communications have dropped considerably. The price for rolling out fiber to the home has currently become more cost-effective than that of rolling out a copper based network. Prices have dropped to $850 per subscriber in the US and lower in countries like The Netherlands, where digging costs are low.Since 1990, when optical-amplification systems became commercially available, the telecommunications industry has laid a vast network of intercity and transoceanic fiber communication lines. By 2002, an intercontinental network of 250,000 km of submarine communications cable with a capacity of 2.56 Tb/s was completed, and although specific network capacities are privileged information, telecommunications investment reports indicate that network capacity has increased dramatically since 2004.

aditi virmani

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28 Mar 2010 22:39:13 IST

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optical fibres are also used as endoscopy in medical sciences....they are also used for transferring and receiving electric signals and converting them into light signals by suitable devices........

pradeep rout

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29 Mar 2010 10:13:31 IST

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An optical fiber is a glass or plastic fiber that carries light along its length. Fiber optics is the overlap of applied science and engineering concerned with the design and application of optical fibers. Optical fibers are widely used in fiber-optic communications, which permits transmission over longer distances and at higher bandwidths (data rates) than other forms of communications.

Optical fiber can be used as a medium for telecommunication and networking because it is flexible and can be bundled as cables. It is especially advantageous for long-distance communications, because light propagates through the fiber with little attenuation compared to electrical cables. This allows long distances to be spanned with few repeaters.

Fibers have many uses in remote sensing. In some applications, the sensor is itself an optical fiber. In other cases, fiber is used to connect a non-fiberoptic sensor to a measurement system

Fibers are widely used in illumination applications. They are used as light guides in medical and other applications where bright light needs to be shone on a target without a clear line-of-sight path. In some buildings, optical fibers are used to route sunlight from the roof to other parts of the building.

Optical fiber is also used in imaging optics.

In spectroscopy, optical fiber bundles are used to transmit light from a spectrometer to a substance which cannot be placed inside the spectrometer itself, in order to analyze its composition.

An optical fiber doped with certain rare earth elements such as erbium can be used as the gain medium of a laser or optical amplifier.

Optical fibers doped with a wavelength shifter are used to collect scintillation light in physics experiments.

Optical fiber can be used to supply a low level of power (around one watt) to electronics situated in a difficult electrical environment. Examples of this are electronics in high-powered antenna elements and measurement devices used in high voltage transmission equipment.

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