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07-03-2010, 11:25 AM
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08-03-2010, 04:26 PM
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RE: optical fiber communication
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14-10-2010, 11:04 AM
Post: #3
RE: optical fiber communication

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Optical fiber communication —An overview

Department of Physics, Anna University, Chennai 600 025, India


This paper deals with the historical development of optical communication systems and their failures initially. Then the different generations in optical fiber communication along with their features are discussed. Some aspects of total internal reflection, different types of fibers along with their size and refractive index profile, dispersion and loss mechanisms are also mentioned. Finally the general system of optical fiber communication is briefly mentioned along with its advantages and limitations. Future soliton based optical fiber communication is also highlighted. Keywords. Bandwidth; optical fiber; group index; group velocity; soliton v-number; dispersion. PACS Nos 42.65 Tg; 47.81 Dp; 42.79 Sz; 05.45 Yv 1. Introduction Now we are in the twenty first century, the era of ‘Information technology’ [1-6]. There is no doubt that information technology has had an exponential growth through the modern telecommunication systems. Particularly, optical fiber communication plays a vital role in the development of high quality and high-speed telecommunication systems. Today, optical fibers are not only used in telecommunication links but also used in the Internet and local area networks (LAN) to achieve high signaling rates. 1.1 Historical perspective of optical communication The use of light for transmitting information from one place to another place is a very old technique. In 800 BC., the Greeks used fire and smoke signals for sending information like victory in a war, alertting against enemy, call for help, etc. Mostly only one type of signal was conveyed. During the second century B.C. optical signals were encoded using signaling lamps so that any message could be sent. There was no development in optical communication till the end of the 18th century. The speed of the optical communication link was limited due to the requirement of line of sight transmission paths, the human eye as the receiver and unreliable nature of transmission paths affected by atmospheric effects such as fog and rain. In 1791, Chappe from France developed the semaphore for telecommunication on land. But that was also with limited information transfer.
18-10-2010, 11:48 AM
Post: #4
RE: optical fiber communication

.ppt  Optical Fibers.ppt (Size: 392.5 KB / Downloads: 200)

optical fiber communication

By: Bibek Thapa
BscIT (IInd sem)


Core – thin glass center of the fiber where light travels.
Cladding – outer optical material surrounding the core
Buffer Coating – plastic
coating that protects
the fiber.

Type of Fibers

Optical fibers come in two types:
Single-mode fibers – used to transmit one signal per fiber (used in telephone and cable TV).

Multi-mode fibers – used to transmit many signals per fiber (used in computer networks).
03-01-2011, 02:05 PM
Post: #5
RE: optical fiber communication

.ppt  ppt of optical fibre1.ppt (Size: 1.51 MB / Downloads: 157)

Evolution of Fiber

1880 – Alexander Graham Bell
1930 – Patents on tubing
1950 – Patent for two-layer glass wave-guide
1960 – Laser first used as light source
1965 – High loss of light discovered
1970s – Refining of manufacturing process
1980s – OF technology becomes backbone of long distance telephone networks in NA.

Fiber-optic communication
is a method of transmitting information from one place to another by sending light through an optical fiber.
The light forms an electromagnetic carrier wave that is modulated to carry information.

Optical Detectors

There are two types of Detectors
1. P-I-N Photodiodes
2. AVALANCHE Photodiodes


Splices are the permanent between two fibers.

Splicing Methods
1. Adhesive bonding or Glue splicing
2. Mechanical splicing
3. Fusion splicing

Fiber Optic Advantages

Large bandwidth ( >5.0 GHz for 1km length
smaller size and lighter weight
lower attenuation
immunity to environmental interference
highly secure due to tap difficulty and lack of signal radiation
Universal medium

DisAdvantages of fiber optics

Disadvantages include the cost of interfacing equipment necessary to convert electrical signals to optical signals. (optical transmitters, receivers) Splicing fiber optic cable is also more difficult.

Fiber Optic Disadvantages
expensive over short distance
requires highly skilled installers
adding additional nodes is difficult

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