A Case Study of Signal-to-Noise Ratio in Ring-Based Optical Networks-on-Chip

Abstract

Abstract-Microresonators have been utilized to construct optical interconnection networks. One of the drawbacks of these microresonators is that they suffer from intrinsic crosstalk noise and power loss, resulting in Signal-to-Noise Ratio (SNR) reduc-tion and system performance degradation at the network level. The novel contribution of this paper is to systematically study the worst-case crosstalk noise and SNR in a ring-based ONoC, the Corona. In the paper, Corona's data channel and broadcast bus are investigated, with formal general analytical models presented at the device and network levels. Leveraging our detailed analytical models, we present quantitative simulations of the worst-case power loss, crosstalk noise, and SNR in Corona. Moreover, we compare the worst-case results in Corona with those in mesh-based and folded-torus-based ONoCs, all of which consist of the same number of cores as Corona. The quantitative results demonstrate the damaging impact of crosstalk noise and power loss in Corona: the worst-case SNR is roughly 14.0 dB in the network, while the worst-case power loss is substantially high at -69.3 dB in the data channel.

Process variation aware crosstalk mitigation for DWDM based photonic NoC architectures

“…On the other hand, in crossbar architectures such as Corona [4] that use 64 wavelength DWDM, there exists significant crosstalk noise. The quantitative results in [16] demonstrate the damaging impact of crosstalk noise in Corona, where the worst-case SNR is estimated to be about 14dB in data waveguides, which is insufficient for reliable data communication. To mitigate the impacts of crosstalk noise in DWDM based PNoCs, two encoding techniques PCTM5B and PCTM6B are presented in [13].…”

Optimize the Power Consumption and SNR of the 3D Photonic High-Radix Switch Architecture Based on Extra Channels and Redundant Rings

“…Xu et al [12] proposed a series of solutions to the wavelength drifting problem of microrings and bandwidth loss problem of the optical network, due to PV. Some other researchers [13][14][15] focused on the SNR of the optical network; they analyzed and computed the worstcase SNR of many network architectures such as Corona and Intra/Inter networks.…”

“…All of the optical devices would introduce power loss and noise to the signal. e optical devices' parameters are shown in Table 1 [14]. e signal power and noise power in the receive port j can be expressed as (1) and (2), respectively:…”

CLAP: a crosstalk and loss analysis platform for optical interconnects

“…Relying on our previous works [2] and [3], we present a formal analytical approach that enables worst-case incoherent and coherent crosstalk analyses in different OIN architectures. The presented hierarchical formal analytical approach models the power loss and crosstalk in basic photonic devices and utilizes those analyses to study the worst-case crosstalk and SNR at the router and network levels in OINs.…”

“…Furthermore, CLAP is capable of providing the worst-case and the average results. By way of example, we employed CLAP to compare the worst-case SNR and power loss in two ring-based optical networks-onchip (ONoCs), Corona and sectioned undirectional optical ring (SUOR) networks, both of which consisted of 256 processor cores [3], [7]. Fig.…”