Abstract
The bridging element between the transmitter and receiver is generally known as transmission channel. Any improvement in this transmission channel aims at either to improve the transmission fidelity or to increase the data rate or to increase the transmission distance between the two stations. Also, the amount of information transmitted is directly related to the frequency range over which the carrier wave operates, increasing the carrier frequency increases the available transmission band width and consequently provides larger information carrying capacity. Therefore, great interest in communication at optical frequencies (~ 5 × 1014 Hz) was created with the advent of lasers in 1966 and hence the birth of optical fibers (working on the principle of total internal reflection). The first silica optical fiber showed the losses in the transmission signal over 1000dB/km. The attenuation in the signals is caused by absorption, scattering, radiative, distortions, pulse broadening, mode couplings etc1. However, the attractive advantages, (low weight, wider band width, hair size dimensions, immunity to the electric interference, low fiber to fiber cross talks, high degree of data security, etc), over the conventional modes of transmission led researchers to reduce the attenuation in glass fiber around 0.2 dB/km in the 1100 to 1600 nra by early 1980.
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© 1991 Springer Science+Business Media New York
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Nigam, J.K., Malik, A., Bhalla, G.L. (1991). Emerging Developments in Plastic Optical Fibers. In: Prasad, P.N., Nigam, J.K. (eds) Frontiers of Polymer Research. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3856-1_21
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DOI: https://doi.org/10.1007/978-1-4615-3856-1_21
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