6. Theory of directional couplers
6.1 Definition
A directional coupler (figure 35 ) is an octopole which joins together two pairs of lines or guides in such a way that the lines of the same pair (1 and 3 or 2 and 4) are decoupled:
channel 1 (or 3) is coupled to channels 2 and 4 and not to channel 3 (or 1);
channel 2 (or 4) is coupled to channels 1 and 3 and not to channel 4 (or 2).
Let P 1 be the power sent to channel 1 and P 2 , P 3 ...
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Theory of directional couplers
Various types of directional couplers
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