基于阵列波导光栅互连的三偏振复用防冲突接收

Collision-avoid reception for AWG based interconnects by triple polarization multiplexing

摘要:

在基于阵列波导光栅(arrayed waveguide grating,AWG) 的光互连数据中心中,每个节点可以接收由任意波长携带的多个信号,如果节点无法分离信号,则可能导致信道冲突。提出了一种三信道接收方案,允许每个节点同时接收任意一组3个波长的信号(即防冲突)。任意两个信号之间的偏振差为60°。在接收时,复合信号被分到3个偏振分束器(polarization beam splitter,PBS) ,然后经过3个光电检测器(photodetector,PD)进行处理 。每个PBS滤除一个信号,随后的PD检测另外两个信号。3个信号可以通过在电域或数字域中的算术运算从检测结果中复原。改进后的方案不需要波长可调谐接收器或冗余接收器,并实现了单个节点可以同时接收任意一组3个波长的信号。仿真结果验证了改进后方案的可行性。

Abstract:

In an arrayed waveguide gratings (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 (PBSs) followed by three photodetectors (PDs).Each PBS filters out one signal and the PD 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 requires no wavelength-tunable receivers or redundant receivers and enables a single node to receive signals of any set of three wavelengths simultaneously.The simulation results verify the feasibility of the proposed scheme.