Optical Fiber
In theory, the greater the carrier frequency, the larger the available transmission bandwidth and thus the information-carryaing capacity of the communication systyem. For this reason radio communication was developed to higher frequencies(i.e VHF and UHF) leading to the introduction of the even higher frequency microwave and latterly, millimetre wave transmission.It may be also be noted that communicatio at opica frequencies offers an increase in the potential usable bandwidth by factor of around 10000 over high frequency microwave transmission.
In theory, the greater the carrier frequency, the larger the available transmission bandwidth and thus the information-carryaing capacity of the communication systyem. For this reason radio communication was developed to higher frequencies(i.e VHF and UHF) leading to the introduction of the even higher frequency microwave and latterly, millimetre wave transmission.It may be also be noted that communicatio at opica frequencies offers an increase in the potential usable bandwidth by factor of around 10000 over high frequency microwave transmission.
Until 1966 when Kao an Hockham and Werts simultaneously brought the proposals for optical communication via dielectric waveguides or optical fiber the optical communication was carried out through free space using fires, reflecting mirrors,and signaling lamps.The main drawback of free sapce opical communication is the degradation of the optical signal by distrurbances such as rain ,snow,fog,dust and atmospheric 
turbulence.the optical communication via fibre which is now popularly termed as the optical fiber communicationn has overcom this drawback. The information source provides an electrical signal, which drivers an optical source to give modulation of the lightwave carrier. Th optical source,which provides the electrical- optical conversion may be either a semiconductor lase or light emittin diode(LED) . The transmission medium consists of an optical fiber cable. The optical detector proveids demodulation aof the optical carreir. the optical detector, which provides optical-electrical conversion,may be a photodiode or a phototransistor.The optical carrier may be modulated using either an analog aor digital signal.
Science is to know the fact information. Information technology and advanced devices has brought out immense changes in the world. So, as a development of technology optical fiber has played one of the big role in the field of information technology.Optical fiber has won the over the technology of co-axial cables and twisted cable respectively.
Defination:
Optical word comes from the optics,which means light.It is a kind of glass through which data is transferred
in the form of light occuring total internal reflection.
Optical fiber is one of the best technology till now which has following advantages:
turbulence.the optical communication via fibre which is now popularly termed as the optical fiber communicationn has overcom this drawback. The information source provides an electrical signal, which drivers an optical source to give modulation of the lightwave carrier. Th optical source,which provides the electrical- optical conversion may be either a semiconductor lase or light emittin diode(LED) . The transmission medium consists of an optical fiber cable. The optical detector proveids demodulation aof the optical carreir. the optical detector, which provides optical-electrical conversion,may be a photodiode or a phototransistor.The optical carrier may be modulated using either an analog aor digital signal.Science is to know the fact information. Information technology and advanced devices has brought out immense changes in the world. So, as a development of technology optical fiber has played one of the big role in the field of information technology.Optical fiber has won the over the technology of co-axial cables and twisted cable respectively.
Defination:
Optical word comes from the optics,which means light.It is a kind of glass through which data is transferred
in the form of light occuring total internal reflection.Optical fiber is one of the best technology till now which has following advantages:
- Enormous/Higher potential bandwidth .
- No repeaters is needed from 30km-80km.
- Attenuation is minimum.
- Transferring the data in the high speed.
- Data is secured and no losses of datas.
- Small/size and weight.
- Electrical isolation.
- Immunity to interference.
- Signal security.
- Low transmission loss.
- Ruggeddness and flexibility.
- System reliability and ease of maintenace.
- Potential low cost.
No comments:
Post a Comment