SUMMARY We propose and demonstrate for the first time in our knowledge, an optical switch circuit architecture furnishing with the “Bridge and Switch” function, conforming to ITUT-T Recommendation G. 841 Annex A for optical Add-Drop Multiplexers (ADMs) in WDM four-fiber . As evidenced by the recent introduction of optical circuit switches (OCSs) into Google's datacenters and TPU clusters, OCSs provide a way to circumvent many of the limitations of EPS networks. Silicon-Photonic (SiPh) MEMS-based OCSs have been shown to offer a scalable and low- latency approach. Broadband Circuits for Optical Fiber Communication, E. Advanced Signal Integrity for High-Speed Digital Designs, S. Heck, John Wiley & Sons, 2009. High-Speed Digital. An Optical Circuit Switch (OCS) is a device that directly routes optical signals without converting them to electrical signals. This method eliminates the need for multiple conversions between electronic and optical signals, allowing for faster, more efficient data transmission. It is a type of network switch where the signal remains in the optical domain from the source to the destination port. In a typical network switch, the packets received from the optical fibers are first converted to the electrical domain, then switched inside the network ASIC (where they undergo. This paper first summarizes the topologies and traffic characteristics in data centers and analyzes the reasons and importance of moving to optical switching.