Date Added: Jul 2009
The Double-Layer Network (DLN) has some advantages, such as being strictly nonblocking and having a simpler routing algorithm, the lowest system insertion loss, a zero differential loss, and the best Signal-to-Noise Ratio (SNR) compared with any nondilated network. However, they require a large number of switches, interconnection lines and crossovers. In the authors' previous research, these drawbacks can be solved by using Holographic Optical Switches (HOSs). A DLN is a recursive structure network, which consists of three stages: the right stage, the left stage, and the middle stage. The middle stage has four (N/2)?(N/2) subnetworks. In the left stage, there are N 1?2 optical switches.