Part 1. System aspects of intra data center networking -- Chapter 1.Photonics Data Centers -- Chapter 2.Optical switching in Data Centers Architectures based on optical circuit switching -- Chapter 3.Optical switching in Data Centers: Architectures based on optical packet/burst switching -- Part 2. Demonstrations of optical switching in Data Center -- Chapter 4.OSA an Optical Switching Architecture for Data Center Networks with Unprecendented Flexibility -- Chapter 5. The Hi-Ring Architecture for Data Center Networks -- Chapter 6.Low Latency Interconnect Optical Network Switch (LIONS) -- Chapter 7. Torus-Topology Data Center Networks with Hybrid Opto-electronic Routers -- Chapter 8.LIGHTNESS: All-Optical SDN-enabled Intra-DCN with Optical Circuit and Packet Switching -- Chapter 9.Hybrid OPS/EPS Photonic Ethernet Switch and Pure Photonic Packet Switch -- Chapter 10. OPMDC: Optical Pyramid Data Center Network -- Part 3. Technologies for Optical Switching in Data Centers -- Chapter 11.Commercial optical switches -- Chapter 12.Silicon Photonics switch Matrices: Technologies and Architectures -- Chapter 13.Trends in High Speed Interconnects for Datacenter Networking: Multidimensional Formats and Their Enabling DSP -- Chapter 14.Trends in high speed interconnects for data center networking : InP monolithic integration -- Part 4. Prospects and future trends._Chapter 15. The future of switching in data centers.