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Bipartite graph design principle for photonic switching systems

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1 Author(s)
C. -T. Lea ; Sch. of Electr. Eng., Georgia Inst. of Technol., Atlanta, GA, USA

Several attributes of a bipartite graph are exploited in designing switching systems. First, in a network based on bipartite graphs, no two paths are allowed to intersect at a vertex. This attribute is used to design a directional coupler-based photonic switching network with very low crosstalk. Since crosstalk is the most limiting factor in constructing a large directional-coupler-based photonic switching network, crosstalk reduction on the device and architecture levels is an important design issue. Secondly, broadcast, which is an intrinsic property of a bipartite graph (the same is always true with a crossbar representation), is used in designing multiconnection switching networks. Thirdly, it is shown that the nonplanar nature of bipartite graphs makes them well suited for designing three-dimensional free-space-transmission photonic switching systems

Published in:

IEEE Transactions on Communications  (Volume:38 ,  Issue: 4 )