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The potential to operate third-party terminals over multi-domain transparent optical networks attracts operators and customers to implement optical spectrum as a service (OSaaS). Because infrastructure information cannot always be shared with OSaaS end customers, alternatives to off-line quality of transmission (QoT) estimation tools are required to assess the performance of the spectrum slot to estimate achievable throughput. In this paper, commercially available sliceable coherent transceivers are used to assess the generalized signal-to-noise ratio (GSNR) based QoT of the OSaaS in a live production network for both narrowband and wideband OSaaS configurations. Extended channel probing based on symbol rate variability is combined with spectral sweeping and operation regime detection to characterize OSaaS implementations on 17 links with different underlying infrastructure configurations to maximize capacity and increase service margins in a low-margin operation regime. We achieve 0.05 dB estimation accuracy in the GSNR for wideband spectrum services and 0.32 dB accuracy for narrowband spectrum services. Based on the GSNR profile, spectral misalignment, spectral ripple, and operation regime are detected and service margin improvements are demonstrated. Finally, we discuss the network optimization perspective based on acquired data from channel probing and propose use cases for continuous channel probing in transparent optical networks.

QoT assessment of the optical spectrum as a service in disaggregated network scenarios