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학술지 Experimental Demonstration of a Photonic Frame Based Packet-Switched Optical Network for Data Centers
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나용욱, 유상화, 송종태, 이준구
IEEE/OSA Journal of Lightwave Technology, v.38 no.6, pp.1113-1124
Optical Society of America (OSA)
19HH6300, B5G 광엑세스 고속화 및 슬라이싱 기술, 정환석
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 μs that requires only 3 μs guard-time in a 45 μs 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.
KSP 제안 키워드
10 GbE, Arrayed waveguide grating router, Burst-mode receivers(Rx's), Clock and Data Recovery, Compensation method, Data Center Networks, End to End(E2E), Fast tunable laser, Hot spot, Latency performance, Non-uniform Distribution