This article reports on the design and the experimental realization of packet-switched optical network (PSON) for a data center network. In PSON, an optical interconnect consists of a combination of a fast tunable laser (FTL), an arrayed waveguide grating router, and a burst mode receiver (BMR). The conventional FTL transmitters can only accommodate short fixed-size photonic frame (PF) of tens of microseconds rather than variable-size PF due to the short-term wavelength stability. By using the FTL with a thermal compensation method, the PSON can support variable-size PFs with extended size to minimize the switching overhead in the optical switch domain. Our PSON system can achieve up to 96% throughput of 10 GbE service as the end-to-end optical switching time is reduced to 1.94 $\mu$s that requires only 3 $\mu$s guard-time in a 45 $\mu$s time-slot. Total switching time includes wavelength conversion time of FTL, response time of BMR and burst mode-clock and data recovery (BM-CDR). Our PSON will achieve near non-blocking scheduling by use of a centralized scheduler running a grant-aware (GA) scheduling algorithm, which can be further improved to be non-blocking scheduling with a novel algorithm called C-RRP. The C-RRP scheduling algorithm is designed especially for the non-uniform distribution. Simulation results show that C-RRP improves the throughput and latency performance in hot-spot conditions.

中文翻译：

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用于数据中心的基于光子帧的分组交换光网络的实验演示

本文报告了用于数据中心网络的分组交换光网络 (PSON) 的设计和实验实现。在 PSON 中，光互连由快速可调谐激光器 (FTL)、阵列波导光栅路由器和突发模式接收器 (BMR) 组成。由于短期波长稳定性，传统的 FTL 发射器只能适应几十微秒的短固定尺寸光子帧 (PF) 而不是可变尺寸 PF。通过使用具有热补偿方法的 FTL，PSON 可以支持具有扩展尺寸的可变尺寸 PF，以最大限度地减少光开关域中的交换开销。我们的 PSON 系统可以实现高达 96% 的 10 GbE 服务吞吐量，因为端到端光交换时间减少到 1.94 $\mu$s 只需要 3 $\mu$45 分钟的防守时间 $\mu$s 时隙。总切换时间包括 FTL 的波长转换时间、BMR 的响应时间和突发模式时钟和数据恢复 (BM-CDR)。我们的 PSON 将通过使用运行授权感知 (GA) 调度算法的集中式调度器来实现近乎无阻塞的调度，该算法可以通过称为 C-RRP 的新算法进一步改进为无阻塞调度。C-RRP 调度算法是专门针对非均匀分布而设计的。仿真结果表明，C-RRP 提高了热点条件下的吞吐量和延迟性能。