Silicon Photonics Optical Circuit Switch for Access Applications: Happenings and Challenges : Abstract

Optical Circuit Switching (OCS) is gaining traction as a scalable and energy-efficient solution for next-generation access networks, where latency constraints and dynamic bandwidth demands are increasingly critical [1] . Unlike traditional packet-based switching, OCS enables deterministic and transparent optical paths, eliminating unnecessary optical-electrical-optical (OEO) conversions and significantly reducing power consumption. Recent advances in silicon photonics have made it possible to implement compact, cost-effective, and programmable OCS architectures suitable for deployment at the network edge. This technology enables fine-grained optical path reconfiguration, wavelength independence, and high-speed switching, all controlled via software-defined interfaces, offering a viable alternative to access applications such as 5G xHaul, fiber-to-the-premises (FTTx), and edge cloud infrastructures [2] [3] . However, silicon photonics technology is lossy, which is not acceptable for networking applications, either at datacenter or access level. Gain-controlled solutions are possible, but adding amplification to the system has an impact on the bit error rate (BER) that must be considered to preserve signal integrity and avoid packet loss. Furthermore, the novelty of these solutions implies that there is a lack of standardization, resulting in custom infrastructures and protocols.