Abstract
We experimentally demonstrate a highly spectral efficient optical flow control technique for intra data center networks. A bi-directional system is implemented for generating flow control signal by reusing label wavelength and the transmission link within the same WDM channel. Dynamic operation shows high-quality flow control signal with 265 ns latency including 220 ns propagation delay and 500 mV amplitude with low input power and low bias current. Error free operation with 0.5 dB penalty for 40 Gb/s payload indicates that no distortion has been caused due the transmission of label and flow control signal.
Highlights
Data center network (DCN) is continuously growing in size and complexity to accommodate the increasing demand of high performance computers (HPCs) and data-intensive applications [1,2]
We experimentally demonstrate a highly spectral efficient optical flow control technique for intra data center networks
A bi-directional system is implemented for generating flow control signal by reusing label wavelength and the transmission link within the same Wavelength Division Multiplexing (WDM) channel
Summary
Data center network (DCN) is continuously growing in size and complexity to accommodate the increasing demand of high performance computers (HPCs) and data-intensive applications [1,2]. The size of the electronic buffer at the edge nodes depends on the WDM OPS packet forwarding time (reconfiguration of the switch), the delay of the flow control signaling, and the retransmission time. The highly distributed control of the WDM OPS architecture allows the forwarding of the packets within 25 ns [10], the flow control latency will largely affects the buffer size. In this work we experimentally demonstrate a highly spectral efficient and low latency optical flow control based on an optical bi-directional system that exploits direct remodulation of the optical in-band label wavelength to transmit the flow control signaling back to the edge nodes.
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