The importance of lasers in communication and advantages of fiber optics cables
Lasers in communication
Laser communications systems are wireless connections through the atmosphere , the light speed is the fastest speed than anything can travel , so laser communications and laser sensing are important in mortar defense and other crucial aerospace and defense applications .
Lasers are able to see through the dense foliage, and they can allow for space communication from distances measured in millions of miles , We use lasers everywhere such as in the military systems , the avionics , and in submarines .
Laser communications are better than radio as light wavelengths are packed much more tightly than the sound waves , and they transmit more information per second with a stronger signal .
We send and receive data , video and other information , using lasers to encode and transmit data at rates 10 to 100 times faster than radio , Laser is a very intense , concentrated , highly parallel and monochromatic beam , and coherence is very importance property of laser .
Lasers have been used in communications for years , and We can transfer information by lasers every day such as reading CDs and DVDs , and we can scan bar codes at checkout lines or tapping the fiber optic backbone of phone or internet services .
Laser communications systems can be easily deployed because they are inexpensive and small , They have low power and they do not require any radio interference studies , Data exchange is relatively easy to combine with accurate range metering which is essential in many applications .
Lasers communications are solutions to satisfy increasing bandwidth needs , and laser communication systems can transmit speeds of up to a gigabit per second , Laser communications assure much faster data traffic at lower power consumption , smaller geometrical size and much higher immunity to eavesdropping .
The advantages of fiber optics cables
The optical fibers are thin strands of glass through which a laser beam can travel for several miles , and laser amplifiers are needed only every six or seven miles to strengthen the light signal .
One of the advantages of the laser fiber optics is that several fibers can be wrapped inside one cable , and each cable contains many laser beams , each carrying billions of bits of information .
Multiple signals can be sent with high quality and low loss by light propagating along the fibers , and the lasers are more nearly monochromatic and this allows the pulse shape to be maintained better over long distances .
The optical signals are sent at infrared wavelengths of 1.3 to 1.6 micrometres , the glass fibers are most transparent .