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A new type of T-coupler, a so-called asymmetric coupler, in which fibres having different core diameters are used has been realised. This technique can lead to a significant reduction in the input coupling losses between input terminals and transmission fibre. For a moderate number of terminals, the losses of a T-bus with asymmetric couplers are comparable to those of a star bus.
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Weidel et al. (1980) studied this question.
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