Large nxn optical switch using binary trees

Details Large nxn optical switch using binary trees Large nxn optical switch using binary trees

H - Electricity

04

Q

H04Q 3/52 (2006.01) H04Q 11/00 (2006.01) G02B 6/35 (2006.01)

Patent

CA 2358127

A dilated N × N optical cross-connect switch suitable for large N exhibits good efficiency (element count) without a significant increase in and reduced small depth (low loss) and crosstalk. The present arrangement consists of six levels of binary trees of 1 × 2 and 2 × 1 elements. The first two levels form the input stage, the third and fourth levels form the center stage, and the fifth and sixth levels form the output stage. In each of the input, center, and output stages, the odd number level is formed as a binary tree of 1 × 2 elements and the even numbered level is formed as a binary tree of 2 × 1 elements. Each stage is formed by directly joining together the 1 × 2 element binary tree with the 2 × 1 element binary tree. In one embodiment, depth is substantially reduced by using a symmetric arrangement of one or more 2×2 elements located in the vicinity of each junction between adjacent stages. The arrangement also features reduced depth obtained by a Clos type construction.

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