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A new era for optical networks has been started by the development of transceivers based on digital signal processing and operating multilevel modulation formats with coherent and equalized receivers, enabling uncompensated optical links and dynamic transparent wavelength routing in nodes. Connectivity matrices at the physical layer have changed from sparse and static to full and elastic. Therefore, to fully exploit network potentialities and to implement the elasticity paradigm requested by the forecasts of worldwide Internet traffic evolution, the orchestration of logical and physical layer has become a firm requirement. We propose the statistical network assessment process (SNAP) as a method to explore potentialities of physical layer independently of specific traffic allocation. We apply SNAP to a German and to a Pan-EU network topology, first deriving the average bit-rate per lightpath given an any-to-any …