A Parallel Self-Routing Rearrangeable Nonblocking Multi- Photonic Switching Network

摘要

A new rearrangeable nonblocking photonic multi-$log_{2} N$ network $DM(N)$ is introduced. It is shown that $DM(N)$ network possesses many good properties simultaneously. These good properties include all those of existing rearrangeable nonblocking photonic multi-$log _{2} N$ networks and new ones such as $O(log N)$-time fast parallel self-routing, nonblocking multiple-multicast, and cost-effective crosstalk-free wavelength dilation, which existing rearrangeable nonblocking multi-$log _{2} N$ networks do not have. The advantages of $DM(N)$ over existing multi-$log _{2} N$ networks, especially ${rm Log}_{2}left(N, 0, 2^{lfloor {{ log _{2} N}over { 2}} rfloor }right)$, are achieved by employing a two-level load balancing scheme—a combination of static load balancing and dynamic load balancing. $DM(N)$ and ${rm Log}_{2}(N, 0, 2^{lfloor {{ log _{2} N}over { 2}} rfloor })$ are about the same in structure. The additional cost is for the intraplane routing preprocessing circuits. Considering the extended capabilities of $DM(N)$ and current mature and cheap electronic technology, this extra cost is well justified.