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We propose an approach to estimate the end-to-end GSNR accurately in a shorttime when a data center interconnect (DCI) network operator receives a servicerequest from users, not by measuring the GSNR at the operational route andwavelength for the End-End optical path but by simply applying a QoT probechannel link by link, at a convenient wavelength/modulation-format formeasurement. Assuming connections between coherent transceivers of variousfrequency ranges, modulators, and modulation formats, we propose a new devicesoftware architecture in which the DCI network operator optimizes thetransmission mode between user transceivers with high accuracy using onlystandard parameters such as Bit Error Rate. In this paper, we firstexperimentally built three different routes of 32 km/72 km/122 km in the C-bandto confirm the accuracy of this approach. For the operational end-to-end GSNRmeasurements, the accuracy estimated from the sum of the measurements for eachlink was 0.6 dB, and the wavelength-dependent error was about 0.2 dB. Then,using field fibers deployed in the NSF COSMOS testbed (deployed in an urbanarea), a Linux-based transmission device software architecture, and coherenttransceivers with different optical frequency ranges, modulators, andmodulation formats, the fast WDM provisioning of an optical path was completedwithin 6 minutes (with a Q-factor error of about 0.7 dB).

Fast WDM provisioning with minimal probing: the first field experiments for DC exchanges