Abstract-This paper presents a successful test-bed implementation of a multi-vendor transport network interconnection via open WDM interfaces. The concept of applying Alien Wavelengths (AWs) for network expansion was successfully illustrated via deployment of multi-domain/multi-vendor end-to-end OTN services. We evaluate the impact of AW service establishment on both native and other alien services. Our experience confirms the technical feasibility of the concept in the context of transparent network-to-network interconnection at the optical layer. Furthermore, main operational challenges are discussed.

Standard operational practice mandates deploying expensive transponders at the borders between transport network domains. While this provides service guarantees, it also brings high service cost and increased end-to-end delay for the traffic. Deploying open WDM interfaces, often referred to as Alien Wavelengths, is one solution to overcome these drawbacks. This article provides an overview of the development of the Alien Wavelength technology to date. CAPEX and OPEX savings examples are provided together with an extensive analysis of the application of the open WDM interfaces for supporting the future optical Internet and its demanding applications. Our analysis indicates up to 60% savings in deployment cost and up to 70% savings in power consumption for hight bit-rate services deployed via open WDM interfaces.

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