17-08-2010, 05:02 PM
Fiber-optic communication
Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. here, electromagnetic carrier wave is the light which is modulated to carry the information.
Applications
telephone signals, Internet communication, and cable television signals are carried mainly using optical fibres. These have primarily been installed in long-distance applications, where they can be used to their full transmission capacity so that the additional cost can be compensated.
Technology
Transmitters
light-emitting diodes (LEDs) and laser diodes are the main transmitters used. coherent light is produced by laser diodes. Communications LEDs are most commonly made from gallium arsenide phosphide (GaAsP) or gallium arsenide (GaAs). The narrow spectral width of the LEDs allows for high bit rates. a laser source may be operated continuous wave for extremely high data rates
Receivers
a photodetector, which converts light into electricity using the photoelectric effect forms the main component of the reciever. a transimpedance amplifier and a limiting amplifier are also coupled with the optical electrical converters for producing a digital signal in the electrical domain corresponding to the recieved optical signal.
Fiber
An optical fiber consists of a core, cladding, and a buffer (a protective outer coating). total internal reflection is utilised for guiding the light along the fiber. The core and the cladding are made from high-quality silica glass and which has lower refractive index
for details, visit:
http://en.wikipediawiki/Fiber-optic_communication
http://master-photonicsuploads/media/Govind_Agrawal1.pdf
Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. here, electromagnetic carrier wave is the light which is modulated to carry the information.
Applications
telephone signals, Internet communication, and cable television signals are carried mainly using optical fibres. These have primarily been installed in long-distance applications, where they can be used to their full transmission capacity so that the additional cost can be compensated.
Technology
Transmitters
light-emitting diodes (LEDs) and laser diodes are the main transmitters used. coherent light is produced by laser diodes. Communications LEDs are most commonly made from gallium arsenide phosphide (GaAsP) or gallium arsenide (GaAs). The narrow spectral width of the LEDs allows for high bit rates. a laser source may be operated continuous wave for extremely high data rates
Receivers
a photodetector, which converts light into electricity using the photoelectric effect forms the main component of the reciever. a transimpedance amplifier and a limiting amplifier are also coupled with the optical electrical converters for producing a digital signal in the electrical domain corresponding to the recieved optical signal.
Fiber
An optical fiber consists of a core, cladding, and a buffer (a protective outer coating). total internal reflection is utilised for guiding the light along the fiber. The core and the cladding are made from high-quality silica glass and which has lower refractive index
for details, visit:
http://en.wikipediawiki/Fiber-optic_communication
http://master-photonicsuploads/media/Govind_Agrawal1.pdf
