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3.5 Wavelength multiplexing and demultiplexing

Wavelength multiplexers and demultiplexers are needed in order to be able to use wavelength division multiplexing. With just two wavelengths, the multiplexers and demultiplexers can be based on directional couplers because, as mentioned earlier in Section 3.2, couplers are naturally wavelength-de
Author(s): The Open University

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With the unlimited supply of electric light our surroundings very easily may be illuminated too strongly. Too much light is unpleasant for our eyes, and a high level of light in many cases disturbs the conception of form. Just as in a forest, we need shadows, contrasts and variation when we compose with light. If we focus on the term compose, it is natural to conceive our environment as a wholeness. In fact, this is not only aesthetically important, it is true in a physical context. Inspired by
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Stage 1: Problem definition (what is the problem?)

The aim of the first stage is to identify and describe the problem or opportunity. While each stage depends on the success of the previous stage, it is the initial stages of a project that set the direction for the work as a whole. For this reason a clear definition and firm agreement on the problem or opportunity are essential.

Problems and opportunities are like two sides of a coin: one of them can always be formulated in terms of the other. The best way to distinguish between them is
Author(s): The Open University

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