Coherent techniques in analogue signal transmission
- 1 January 1995
- book chapter
- Published by Institution of Engineering and Technology (IET)
Abstract
Most optical fibre analogue transmission systems use intensity modulation of the optical source with direct detection of the modulated optical signal in a depletion photo-detector. In this chapter, coherent techniques are introduced, and their advantages and disadvantages relative to intensity modulation/direct detection (IMDD) systems are considered. Coherent techniques are defined broadly to include all transmission methods where the precise frequency of the optical signal is important.Keywords
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