Collision-Avoid Reception for Awg Based Interconnects by Triple Polarization Multiplexing

Abstract

In an AWG based optical interconnected data center, each node may receive multiple signals carried by arbitrary wavelengths, which may result into channel collision if the node is unable to separate the signals. A triple-channel reception scheme that allows each node to receive an arbitrary set of three wavelengths simultaneously (i.e., collision-avoid) is proposed. The polarization difference between any two signals is 60°. At the reception, the combined signals are split to three polarization beam splitters followed by three photo detectors. Each PBS filters out one signal and the photo detector followed detects the other two signals. The three signals could be recovered from the detected results by arithmetic operation in electrical domain or digital domain. The proposed scheme avoids most collisions without requiring wavelength-tunable receivers or redundant receivers.

Keywords: data centers, AWG based interconnection, triple polarization multiplexing