Fat‐tree‐based optical networks‐on‐chip with WDM: crosstalk noise exploiting. Issue 2 (1st April 2019) - Zhang, Jingping
Abstract : Wavelength division multiplexing (WDM) technology as an extension of optical networks‐on‐chip (ONoCs) performance, can be applied to further overcome shortages of low bandwidth and high‐power consumption in multiprocessor systems‐on‐chip. Nevertheless, WDM‐based ONoCs (ONoCs_W) can encounter performance degradation and network scalability constraints because of its power loss and intrinsic crosstalk noise, especially the non‐linear four‐wave mixing crosstalk noise. Here, a formal systematical exploiting for worst‐case crosstalk noise and optical signal‐to‐noise ratio (OSNR) in arbitrary fat‐tree‐based ONoCs with WDM (FONoCs_W) is proposed. Meanwhile, the worst‐case OSNR optical link candidates are identified. To verify the proposed analysis method, FONoCs_W employing an optical turnaround router with WDM (WOTAR) is used for case study. The study results demonstrate that crosstalk noise significantly diminishes OSNR and restricts scalability of FONoCs_W. For instance, when input optical signal power equals 0 dBm in worst case, the average OSNR is −9.47 dB, the mean power of crosstalk noise for eight wavelengths is slightly greater than that of signal when the number of processor cores is 64; when it equals to 128, the average OSNR is −34.37 dB, decreased by 24.90 dB compared with the network with 64 processor cores.