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Telecommunication Networks by Eugenio Iannone

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4 Technology for Telecommunications: Optical Fibers, Amplifiers, and Passive Devices

4.1 Introduction

The ultimate role of the telecommunication network is to deliver services based on the network capability of transmitting the information generated in one place to faraway places.

Two basic functionalities are involved in this goal: transmission and switching.

Since the introduction of low-loss optical fibers and high-power semiconductor lasers, optics has been the prominent technology for transmission, even if microelectronics have also played a main role in the design of transmission systems.

The great success of optical fiber transmission is due to the coincidence of the low-loss wavelength region of optical fibers with the emission wavelength ...

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