By Ray Tricker
The writer trys to provide an explanation for the expertise to a person absolutely unusual to this box in a simplified and occasionally technically mistaken means. sturdy for normal readers. Senior excessive scholars, mightbe. pondering a task during this box? both technical or now not. Get a extra technical and less-misleading name!
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Additional info for Optoelectronics and Fiber Optic Technology
2 Urban broadband service networks A normal coaxial cable television network using repeaters every 400 to 500 metres is only capable of transmitting 20 to 30 separate television channels within a total bandwidth of about 300 MHz. By using optical waveguides, not only can the bandwidth be increased, but also the number of repeaters required is considerably reduced. This is particularly important in modern suburban communications where many information systems (for example, videotext, videoconferencing, videotelephony, switched broadband communication networks (for extension of banking and shopping facilities as well as cable radio and television) can be supplied over a single fiber optic link.
Minimum loss is the region of about 1300 nm which is also the wavelength at which firstorder material dispersion goes through zero (see Chapter 2). Although designers would prefer to use the long wavelength region because their low fiber attenuation and comparatively low material dispersion permit higher bandwidths, the cost of doing so usually limits their choice. 6 Other losses Other than opaque obstructions on the surface of a fiber, there is always a loss due to reflection from the entrance and exit surface of any fiber.
G. for looking inside the body), telecommunications, which had a requirement for operating over long distances, could only accept a maximum loss of 10 or 20 decibels per kilometre. Help was around the corner, however, as a team from Standard Telecommunications Laboratories (STL) headed by a young Shanghai engineer called Charles K. 17) and another young STL engineer who specialized in antenna theory, called George Hockham, were trying to find a way around fiber attenuation. e. fiber's) properties, which enabled them to reach the conclusion that most of the high losses in early fibers were due to impurities and not to the silica glass itself!
Optoelectronics and Fiber Optic Technology by Ray Tricker