Alex Gillespie's Access Networks: Technology and V5 Interfacing PDF

By Alex Gillespie

ISBN-10: 089006928X

ISBN-13: 9780890069288

Provides a view of present interfacing expertise, particularly V5, the worldwide interface ordinary. The textual content examines either the basics and complicated points of community entry expertise, and the implication for the way forward for entry networks, as much as soliton transmission and quantum cryptology. The publication is split into sections: technological concerns and interface concerns. Separate chapters on complex copper, optical fibre, complicated optical and radio entry applied sciences, the powering of entry networks, ATM within the entry community and the supported prone are incorporated.

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Optical amplifiers can also be integrated with photodiode receivers to increase the sensitivity of the receivers. Optical heterodyne and homodyne techniques were investigated in the years before the development of suitable optical amplifiers because they improve the sensitivity of the diode receivers. These techniques are the optical equivalents of the heterodyne and homodyne techniques used to improve sensitivity in radio communications, and operate through the positive and negative interference of the signal to be detected with a local signal of similar (heterodyne) or identical (homodyne) wavelength.

LEDs also create larger pulse dispersion, since the different wavelength components arrive at the far end at different times because chromatic dispersion of the fiber produces different transmission times for different wavelengths. The cost of laser diodes is mostly determined by the size of the market for them. The physical processes used to produce a laser diode for optical access networks are almost identical to those used for compact disc (CD) players. The cost of these two types of diodes is very different because there is a large market for CD applications, while the market for telecommunications applications is in its infancy.

Using commercially available receivers reduces the cost, since these have an established volume market. Narrow, high-amplitude pulses keep the optical power down while increasing the electrical power in the receiver. This is because electrical power is proportional to the square of the optical power, since the electrical current is proportional to the optical power. This higher electrical power gives a better electrical signal-to-noise ratio. This approach can also be combined with the position of the pulse to increase the information transmitted.

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Access Networks: Technology and V5 Interfacing by Alex Gillespie

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