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• W1651955963 startingPage "245" @default.
• W1651955963 abstract "This chapter discusses the processes of modulation and demodulation of digital signals. Modulation is the process of converting digital data in electronic form to an optical signal that can be transmitted over the fiber. Demodulation is the process of converting the optical signal back into electronic form and extracting the data that was transmitted. The simplest form of digital modulation is on-off keying, which most systems use today. Direct modulation of the laser or LED source can be used for transmission at low bit rates over short distances, whereas external modulation is needed for transmission at high bit rates over long distances. Mainly due to various kinds of noise that get added to the signal in the transmission process, decisions about the transmitted bit (0 or 1) based on the received signal are subject to error. In this discussion, expressions are derived for the bit error rate introduced by the whole transmission process. The process of how the bit error rate can be reduced, for the same level of noise (more precisely, signal-to-noise ratio) by the use of forward error-correcting codes is discussed too. Clock recovery or synchronization, which is the process of recovering the exact transmission rate at the receiver, is also elaborated." @default.
• W1651955963 created "2016-06-24" @default.
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• W1651955963 date "2010-01-01" @default.
• W1651955963 modified "2023-09-27" @default.
• W1651955963 title "Modulation and Demodulation" @default.
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• W1651955963 doi "https://doi.org/10.1016/b978-0-12-374092-2.50012-6" @default.
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