Abstract: Based on the loss parameters of silicon waveguide, waveguide crossing and microresonator based optical switching elements, a general analytical model to study the transmission loss in torus-based optical network on chip (ONoC) is proposed. The model is used to analyze insertion loss at device level, router level and network level. Meanwhile, the automatically analysis system is established. The maximal insertion loss in different network scales is gotten from the analysis system. The maximal insertion loss of the torus-based ONoC using the crossbar, Cygnus and crux is also analyzed. From the numerical investigation, we can get that the insertion loss will enlarge with the increase network scale and the minimum insertion loss is presented at the M=N condition. Meanwhile, compared with the crossbar and Cygnus, the insertion loss of the ONoC using crux is minimum. The insertion loss of the ONoC using crux is less than the insertion loss of the ONoC using Cygnus about 5dB.

Key words: optical communication, optical switching, optical network on chip (ONoC), insertion loss, optical router, torus-based network