A strictly nonblocking network based on nonblocking 4 x 4 optical switches

作者：Lee Chi Ping^*; Chang Chien Ping; Deng Jiun Shiou; Li Min Hao; Lu Ming Feng; Huang Yang Tung; Kuei Ping Yu

来源：Optical Switching and Networking, 2012, 9(1): 1-12.

DOI：10.1016/j.osn.2011.02.001

• Optical multistage network
• Polarization selective element
• Strictly nonblocking
• System insertion loss
• Routing algorithm

Recently, the demand for communication has been growing rapidly. Hence, optical multistage network technologies are more appreciated nowadays. A double-layer network is a strictly nonblocking network, and it has the lowest system insertion loss of non-dilated networks. A Benes network is a rearrangeably nonblocking network, and it has the same system insertion loss as a double-layer network. We have proposed the use of modified polarization selection elements (PSEs). The system insertion loss, number of drivers, and number of required components of a double-layer network could be reduced if it is constructed with modified PSEs. A nonblocking 4 x 4 optical switch with two stages of polarization selective elements has been presented in our previous study. Based on this nonblocking 4 x 4 optical switch, we propose a strictly nonblocking network structure which features even lower system insertion loss than those of a double-layer network and a Benes network. The signal-to-noise ratio of the proposed network structure is a constant, and is higher than the constraint, although it is lower than that of the double-layer network. The number of major components of the proposed network is less than that of a double-layer network and larger than that of a Benes network, since a Benes network is rearrangeably nonblocking. We also offer a routing algorithm for the new proposed network; the time complexity of the routing algorithm is O(1).

• 出版日期2012-1
• 单位中国人民解放军国防大学