Infrared signals are the electromagnetic radiations with wavelengths longer than the visible light but shorter than the radio waves. Infrared signals, with frequencies from 300 GHz to 400 THz (wavelengths from 1 mm to 770 nm) can be used for the short range communication. Infrared signals, having high frequencies can not penetrate into the walls. This advantageous characteristic prevents interference between one system and the other. A short range communication in one room can not be affected by another system in next room. When we use our infrared remote control, we do not interfere with the use of remote by our neighbors.
However, this same characteristic makes infrared signals useless for the long range communication. In addition, we can not use the infrared waves outside a building as the sun's rays contain infrared waves that can interfere with the communication. The infrared band, almost 400 THz, has an excellent potential for the data transmission. Such a wide bandwidth can be used to transmit the digital data with a very high data rate. Such a wide bandwidth can be used to transmit the digital data with a very high data rate. Infrared waves are used for the short range communications such as those between a PC and peripheral device.
However, this same characteristic makes infrared signals useless for the long range communication. In addition, we can not use the infrared waves outside a building as the sun's rays contain infrared waves that can interfere with the communication. The infrared band, almost 400 THz, has an excellent potential for the data transmission. Such a wide bandwidth can be used to transmit the digital data with a very high data rate. Such a wide bandwidth can be used to transmit the digital data with a very high data rate. Infrared waves are used for the short range communications such as those between a PC and peripheral device.
