Difference between general communication sysyem and optical communication system
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The type of communication which uses light as medium of communication is known as optical communication. Light is an electro-magnetic signal like radio waves. It can be modulated by information and transmitted over fiber optic cable.
As frequency of light is extremely high, it can accommodate very wide bandwidths of information. This results into support for high data rates with excellent reliability.
Step-1: The information (voice, video, data) to be transmitted will be converted into the form compliant to medium. Appropriate coder or converter is used for this purpose which converts analog signals into digital pulses. A/D converter can be used for this. The computer data can already be in the digital form.
• Step-2: The optical transmitter device (such as LED ) is used to flash light source ON and OFF based on digital pulses. Infrared beams are also used in the transmission of information. The other optical transmitter device is solid state laser.
• Step-3: The light beams are fed appropriately into fiber optic cable so that it can be transmitted over long distances.
As frequency of light is extremely high, it can accommodate very wide bandwidths of information. This results into support for high data rates with excellent reliability.
Step-1: The information (voice, video, data) to be transmitted will be converted into the form compliant to medium. Appropriate coder or converter is used for this purpose which converts analog signals into digital pulses. A/D converter can be used for this. The computer data can already be in the digital form.
• Step-2: The optical transmitter device (such as LED ) is used to flash light source ON and OFF based on digital pulses. Infrared beams are also used in the transmission of information. The other optical transmitter device is solid state laser.
• Step-3: The light beams are fed appropriately into fiber optic cable so that it can be transmitted over long distances.
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