  In this work, we propose and experimentally assess the automatic and flexible
NSs configurations of optical OPSquare DCN controlled and orchestrated by an
extended SDN control plane for multi-tenant applications with differentiated
QoS provisioning. Optical Flow Control (OFC) protocol has been developed to
prevent packet losses at switch sides caused by packet contentions.Based on the
collected resource topology of data plane, the optical network slices can be
dynamically provisioned and automatically reconfigured by the SDN control
plane. Meanwhile, experimental results validate that the priority assignment of
application flows supplies dynamic QoS performance to various slices running
applications with specific requirements in terms of packet loss and
transmission latency. In addition, the capability of exposing traffic
statistics information of data plane to SDN control plane enables the
implementation of load balancing algorithms further improving the network
performance with high QoS. No packet loss and less than 4.8 us server-to-server
latency can be guaranteed for the sliced network with highest priority at a
load of 0.5.
