FOScube: a Scalable Data Center Network Architecture Based on Multiple Parallel Networks and Fast Optical Switches

Compact 8×8 SOA-Based Optical WDM Space Switch in Generic InP Technology

“…2(b) shows a typical path from one input to one output. LC = L1+L4 and LP = L2+L3 represent the coupling and path losses, respectively, while the gain is the contribution of 3 SOAs (shown in orange boxes) in a line, given as G1, G2, and G3, for the presentative path with SOAs B [1,6], B [2,16] and B [1,2]. When all SOAs are provided with transparency current, the difference between the output and input signal spectrum gives the fiber-to-fiber path loss (F2F = G+LC+LP, with G = 0), since the SOAs neither absorb nor amplify the signal at transparency.…”

“…Since the fiber-to-fiber signal loss encompasses coupling loss at the chip facets LC and net on-chip gain (Lnet = G+LP), coupling loss LC can be obtained by subtracting net on chip gain from fiber to fiber transmission F2F (LC = F2F-Lnet). To determine on-chip component loss, we first connected the laser to the input port and recorded photocurrent I in at the gate of SOA B [1,6]. Then biasing B [1,6] at the transparency current of 14 mA, we measured the generated photocurrent at B [2,16], I inm .…”

“…To determine on-chip component loss, we first connected the laser to the input port and recorded photocurrent I in at the gate of SOA B [1,6]. Then biasing B [1,6] at the transparency current of 14 mA, we measured the generated photocurrent at B [2,16], I inm . After that, photocurrent I out at B [1,12] was recorded with the light signal applied from the output port.…”

“…A viable solution to these problems is to use architectures that utilize optical switches [4], [5]. Flat data center architectures based on an optical network, instead of electronic switch-based hierarchical networks, have been proposed, offering notable advantages in latency and power consumption [6]. In these scenarios, fast and bit-rate agnostic optical switches that can scale to several port counts play a crucial role.…”

SDN-Enabled Reconfigurable Optical Data Center Networks Based on Nanoseconds WDM Photonics Integrated Switches

“…The system-level validations of the fast optical switch node based on developed prototypes have been reported [4,5], which has demonstrated the promising capabilities for the potential applications in high-capacity and lowlatency DCNs. Commercial discrete components are used in the developed prototypes to implement the fast optical switch, whereas the practical implementation would require the integration of hundreds or even more of those optical components, resulting in power-inefficient bulky systems.…”