Unlock instant, AI-driven research and patent intelligence for your innovation.

Large NXN light switch using binary system tree

A binary tree, non-blocking optical switch technology, applied in the selection device, optics, light guide and other directions of the multiplexing system, which can solve problems such as impracticality

Inactive Publication Date: 2002-05-08
LUCENT TECH INC
View PDF0 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this layout is impractical for large N due to the large number of components required, 2N(N-1)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Large NXN light switch using binary system tree
  • Large NXN light switch using binary system tree
  • Large NXN light switch using binary system tree

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] According to the apparatus of the present invention, an extended NxN cross-connection suitable for large N is disclosed, which achieves high efficiency (low number of components) with low depth (low loss) and low crosstalk value. Compared with the classic crossbar layout, the width and the number of components are greatly reduced without increasing the depth and crosstalk. In the simplest case, the layout is realized with three stages, each stage comprising two layers of binary trees of 1x2 switching elements and 2x1 switching elements. An important feature of this layout is that successive levels are connected together by connecting the roots on either side of a node directly together. Therefore, by replacing the 1x2 elements and 2x1 elements near the junction with a smaller number of 2x2 elements, the overall depth can be greatly reduced. On the other hand, this technique increases the number of links between stages, so it is mainly used in situations where depth (lo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A dilated NxN 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 1x2 and 2x1 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 1x2 elements and the even numbered level is formed as a binary tree of 2x1 elements. Each stage is formed by directly joining together the 1x2 element binary tree with the 2x1 element binary tree. In one embodiment, depth is substantially reduced by using a symmetric arrangement of one or more 2x2 elements located in the vicinity of each junction between adjacent stages. The arrangement also features reduced depth obtained by a Clos type construction.

Description

technical field [0001] The present invention relates to an optical cross-connection switch, in particular to a large N*N layout suitable for a binary tree of an optical cross-connection switch. Background technique [0002] In high-capacity optical networks, an important device is the N×N cross-connect switch. The function of this device is to provide full connectivity over several input fibers per node, where each fiber carries several wavelength channels. The switch must be a non-blocking switch [1-11], and it must be fast and efficient. (Note that in this technical note, a reference to another document is indicated by a number in square brackets to identify its position in the reference list in the appendix.) Using the classic crossover structure, it includes 1×2 elements and A binary tree of 2 × 1 elements [2] can achieve these properties with minimal loss and crosstalk. However, this layout is impractical for large N due to the large number of components required, 2N...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G02B6/35H04B10/27H04B10/29H04L12/56H04Q3/52H04Q11/00
CPCH04Q2011/0052G02B6/3556H04Q2011/0056H04Q11/0005H04Q2011/0024G02B6/3542
Inventor 科拉杜·皮尔特罗·德拉贡
Owner LUCENT TECH INC