Although the subject of this book is optical communications, the field encompasses many different aspects of electronic engineering: electromagnetic theory, semiconductor physics, communications theory, signal processing and electronic design. In a book of this length, we could not hope to cover every one of these different fields in detail. Instead we will deal with some aspects in depth and cover others by more general discussion. This chapter introduces the book and begins with a general discussion of how modern-day optical communications came about.
KeywordsElectromagnetic spectrum Wavelength of light Ruby laser Optical fibre Transmission windows Avalanche photodiodes PIN photodiodes Synchronous digital hierarchy Non-return to zero Return to zero
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