E. Lu, M. Yang, B. Yang, X. Feng, and S.Q. Zheng
Self-routing, crossbar, Banyan network, crosstalk, optical switching, nonblocking network
Optical communications with photonic switching are promising to provide high bandwidth and low error bit. Self-routing strictly nonblocking networks are always favoured to be used as switching networks due to their simple routing mechanisms and nonblocking properties. However, crosstalk problems in photonic switching add a new dimension of nonblocking constraints on optical switching networks. The classical self-routing strictly nonblocking N × N crossbar network has N2 switching elements (SEs) and 2N − 1 con- nection diameter, and needs N wavelengths for nonblocking switch- ing. In this paper, we propose a new class of self-routing strictly nonblocking networks by studying the connection capacity of self- routing blocking Banyan-type networks. The new proposed N × N networks have no more than N2 − N SEs and (log N) connection diameter. Furthermore, they need no more than two wavelengths for nonblocking switching. Compared with existing strictly non- blocking self-routing networks, the presented new networks have lower hardware cost, shorter connection diameter, and much smaller number of required wavelengths. Consequently, they are more feasi- ble for implementation with reduced optical signal attenuation and crosstalk.
Important Links:
Go Back
