Abstract
In this work, we analyze the effects of the presence of waveguides in a wireless on-chip optical channel, which act as obstacles for the rays composing the propagating signal. The analysis has been performed numerically by using the FDTD method, and the simulation results have been validated by the experimental characterization. This work focuses on the relationship between the received signal and the position of the obstacles on the circuit plane in a multilayered channel made of heterogeneous dielectric cladding. We show how the crossing waveguide perturbates the received power and we provide ad hoc guidelines for the best topological choices allowing to mitigate losses. Moreover, with a good agreement between numerical and experimental results, amounting to a variation of less than 1 dB, we have demonstrated that the effects of this perturbation in real chips can be predicted. The results of this analysis, as well as increasing the level of knowledge of on-chip optical wireless links, allow a better comprehension and control of unbound optical signals within the optical chip environment.
Highlights
Evolution of computation technology faces various challenges
With a good agreement between numerical and experimental results, amounting to a variation of less than 1 dB, we have demonstrated that the effects of this perturbation in real chips can be predicted
To better highlight the influence of the crossing waveguide on the wireless signal propagation we report in Fig. 3 the power density (log10(|Pxyz |)) in the XY plane and in the XZ plane
Summary
Evolution of computation technology faces various challenges. The intrinsic limits of metallic wires and the physical limits of scalability hinder the possibility to address the requirements of higher communication complexities of modern NoCs, both in terms of density and bandwidth [1]. An important requirement for optical antennas for OWiNoCs is a high gain in the longitudinal direction (on-chip plane). A further important step in the actual implementation of OWiNoC is the in-depth knowledge of the propagation channel characteristics necessary to predict the communication performances and to deduce network design criteria For this purpose, different approaches are feasible. More realistic structures based on a homogeneous cladding, with air on top and Silicon layer on bottom, have been considered using both RT and FDTD [21]–[24] Those studies underlined the dependence of the performance of wireless links on the antenna configuration, on the geometrical parameters of the system and on the materials composing the antennas and the propagation medium. The knowledge of the behavior of wireless links in presence of an obstacle can allow to define design criteria for optimal placing of crossing waveguides and it opens up new possibilities for the exploration of different network topologies.
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