Fibre optic cable used for telephones
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Fibre optic cable used for telephones
Fibre optic communications. A cable containing optical fibres used to transmit telephone signals. The fibre optic filaments are seen at top right; the rest of the cable is shielding and protective layers. The fibres are made from a special glass which is flexible and has a high refractive index. Each filament is then coated with a protective layer with a low refractive index. A light beam entering the end of the fibre is completely internally reflected at the cylindrical surface of the core. The light may thus travel along the entire cable with little or no absorption. The telephone conversations are carried as pulsed, coded laser signals
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6437061
© PASIEKA/SCIENCE PHOTO LIBRARY
Communications Fibre Optics Light Guide Optical Fibres
EDITORS COMMENTS
This print showcases the intricate design and functionality of a fibre optic cable used for telephones. At first glance, one can observe the delicate optical fibres positioned at the top right corner of the image. These fibres serve as conduits for transmitting telephone signals, revolutionizing communication in our modern world. The filaments themselves are crafted from a special glass that possesses both flexibility and a high refractive index. To ensure their durability, each filament is meticulously coated with a protective layer boasting a low refractive index. This combination allows for optimal transmission of light beams throughout the entire cable while minimizing any potential absorption. What makes this technology truly remarkable is its reliance on complete internal reflection at the cylindrical surface of the core. As light enters one end of these fibres, it bounces off this surface repeatedly, enabling it to travel along vast distances within the cable without significant loss or degradation. Through pulsed and coded laser signals, telephone conversations are effortlessly carried across these fibre optic cables. This innovative method ensures efficient and reliable communication between individuals separated by great distances. In summary, this mesmerizing photograph captures not only an essential component of our telecommunications infrastructure but also represents how science has harnessed light to transform global connectivity through fibre optics technology.
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