The last decade, and above all the last year affected by the pandemic, made us acknowledge how much our everyday life is dependent on internet. Nowadays communication but also entertainment, news, healthcare, shopping and so on, rely on web-conveyed data. This exponential increase of information traffic demands more and more computational resources, for processing and transportation of data. In such a cloud-based world, the already consolidated paradigm is that of centralized computation, which involves large-scale data centres where most of the data traffic occurs. It is understood, then, that the role of short range intra-datacenter interconnections is essential: bitrates up to Tbit/s and negligible energy consumption ultimately led to the employment of optical links and in particular Vertical Cavity Surface Emitting Lasers (VCSELs) for data transmission.