Abstract
In today’s modern data center design, optical interconnects forms an integral part for high-speed switching and design applications. In the past, Arrayed Waveguide Grating (AWG) was investigated heavily as they provided much-required solutions for contention resolution and packet routing. These designs are truly based on the concept of wavelength parallelism and routing nature of AWG. Also, the design of optical switches were categorized into two classes namely, buffer-based design and bufferless design. Without a buffer, previously the concept of All-Optical Negative Acknowledgement (AO-NACK) is introduced. In these designs, a negative acknowledgment is sent back to the sender in case of dropping of packets through a reflector wavelength. The sender then retransmits the packets. The drawback of such a scheme is that a large number of packets gets retransmitted which leads to cyclic congestion in the network. In this paper, the authors propose a buffer based design with AO-NACK scheme so that the number of transmitted packets is greatly reduced to about 400 times in case of bufferless designs, in case of transmission of 106 packets. Also, the authors propose a simplified architecture for switch design so that AO-NACK hardware design cost is reduced significantly.
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Bhattacharya, P., Tiwari, A.K., Ladha, A., Tanwar, S. (2020). A Proposed Buffer Based Load Balanced Optical Switch with AO-NACK Scheme in Modern Optical Datacenters. In: Singh, P., Panigrahi, B., Suryadevara, N., Sharma, S., Singh, A. (eds) Proceedings of ICETIT 2019. Lecture Notes in Electrical Engineering, vol 605. Springer, Cham. https://doi.org/10.1007/978-3-030-30577-2_8
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