In this paper, we present Alibaba’s practices and views on open and disaggregated optical transport networks, with a focus on metro data center interconnects (DCIs). We first discuss technology developments that have enabled open optical transport networks, followed by a presentation of our open optical network architecture for DCI networks. We then describe an overall data center network architecture and the application scenario of open and disaggregated DCI technology. Details of the point-to-point DCI network architecture and the need for reconfigurable optical add–drop multiplexers (ROADMs) in DCI networks are then discussed. We present the data models of DCI equipment, including optical terminal transponders, point-to-point optical line systems, and ROADMs, developed based on OpenConfig YANG models. The detailed design and implementation of a home-grown control and management software platform for DCI networks are also presented. We conclude with a discussion of the real deployment of the technology in Alibaba’s networks.
Facing the challenges of tremendous increasing of traffic requirement, ultra high speed optical transmissions at or beyond lOOGb/s per channel transmissions is needed. We numerically study the performance of the no-guard-interval orthogonal frequency division multiplexing (NGI-OFDM) employing polarization division multiplexing (PDM) and coherent optical detection. Transmissions performance of single channel 200Gb/s with 2 carriers is simulated under the influence of residual dispersion, without or without digital carrier separation. It is found that the performance of NGI-OFDM might worsen seriously under the uncompensated chromatic dispersion, which breaks the orthogonal condition between the carriers. Keywords: orthogonal polarization dispersion coherent frequency division
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