TY - JOUR
T1 - Nanosecond photonic integrated multicast switch for low-latency optical wireless data center networks
AU - Zhang, Shaojuan
AU - Tessema, Netsanet M.
AU - Freire Santana, Henrique
AU - Kraemer, Rafael
AU - Xue, Xuwei
AU - Tangdiongga, Eduward
AU - Calabretta, Nicola
PY - 2022/8/15
Y1 - 2022/8/15
N2 - Optical wireless data center networks (OW-DCNs), featur- ing no cable complexity, low latency, and high throughput, are highly attractive for the next generation of DCNs, while photonic integration provides a compact, low-power, and low-cost solution. In this Letter, we propose a novel, to the best of our knowledge, OW-DCN architecture using pho- tonic integrated multicast switches (PIC-MCSs) to realize fast optical switching and multicast operation between top- of-the-rack switches (ToRs). By properly turning on/off the transmission channels of a semiconductor optical amplifier (SOA)-based PIC-MCS, the optical signals are directed to different target ToRs via arrayed waveguide grating routers (AWGRs) and free-space links. A 4×2 PIC-MCS with loss- less multicast operation has been designed and fabricated. An OW-DCN of 4×4 interconnected racks has been exper- imentally demonstrated with the chip and a 4×4 AWGR. The results confirm the performance of low-latency switch- ing, dynamic bandwidth reallocation, and WDM multicast transmission. Error-free operation at 10 Gb/s OOK with a power penalty of less than 1 dB is achieved, showing a neg- ligible impact of cross talk on the PIC-MCS.
AB - Optical wireless data center networks (OW-DCNs), featur- ing no cable complexity, low latency, and high throughput, are highly attractive for the next generation of DCNs, while photonic integration provides a compact, low-power, and low-cost solution. In this Letter, we propose a novel, to the best of our knowledge, OW-DCN architecture using pho- tonic integrated multicast switches (PIC-MCSs) to realize fast optical switching and multicast operation between top- of-the-rack switches (ToRs). By properly turning on/off the transmission channels of a semiconductor optical amplifier (SOA)-based PIC-MCS, the optical signals are directed to different target ToRs via arrayed waveguide grating routers (AWGRs) and free-space links. A 4×2 PIC-MCS with loss- less multicast operation has been designed and fabricated. An OW-DCN of 4×4 interconnected racks has been exper- imentally demonstrated with the chip and a 4×4 AWGR. The results confirm the performance of low-latency switch- ing, dynamic bandwidth reallocation, and WDM multicast transmission. Error-free operation at 10 Gb/s OOK with a power penalty of less than 1 dB is achieved, showing a neg- ligible impact of cross talk on the PIC-MCS.
UR - http://www.scopus.com/inward/record.url?scp=85137686418&partnerID=8YFLogxK
U2 - 10.1364/OL.464372
DO - 10.1364/OL.464372
M3 - Article
SN - 0146-9592
VL - 47
SP - 4247
EP - 4250
JO - Optics Letters
JF - Optics Letters
IS - 16
ER -