Requests provisioning algorithms for Dynamic Optical Circuit Switched (DOCS) networks: A survey

2009 ◽  
Author(s):  
Ali Munir ◽  
Savera Tanwir ◽  
S. M. Hasan Zaidi
Keyword(s):  
Optical Circuit

Load-Optimization in Reconfigurable Networks

2021 ◽  
Vol 48 (3) ◽  
pp. 39-44 ◽  
Author(s):  
Wenkai Dai ◽  
Klaus-Tycho Foerster ◽  
David Fuchssteiner ◽  
Stefan Schmid
Keyword(s):  
Data Centers ◽  
Algorithmic Problem ◽  
Reconfigurable Networks ◽  
Load Optimization ◽  
Clos Networks ◽  
Optical Circuit ◽  
Tree Topologies ◽  
Packet Switch ◽  
Routing Policies

Emerging reconfigurable data centers introduce the unprecedented flexibility in how the physical layer can be programmed to adapt to current traffic demands. These reconfigurable topologies are commonly hybrid, consisting of static and reconfigurable links, enabled by e.g. an Optical Circuit Switch (OCS) connected to top-of-rack switches in Clos networks. Even though prior work has showcased the practical benefits of hybrid networks, several crucial performance aspects are not well understood. In this paper, we study the algorithmic problem of how to jointly optimize topology and routing in reconfigurable data centers with a known traffic matrix, in order to optimize a most fundamental metric, maximum link load. We chart the corresponding algorithmic landscape by investigating both un-/splittable flows and (non-)segregated routing policies. We moreover prove that the problem is not submodular for all these routing policies, even in multi-layer trees, where a topological complexity classification of the problem reveals that already trees of depth two are intractable. However, networks that can be abstracted by a single packet switch (e.g., nonblocking Fat-Tree topologies) can be optimized efficiently, and we present optimal polynomialtime algorithms accordingly. We complement our theoretical results with trace-driven simulation studies, where our algorithms can significantly improve the network load in comparison to the state of the art.

PDMS-based optical waveguide layer for integration in electrical–optical circuit boards

2007 ◽  
Vol 61 (3) ◽  
pp. 163-167 ◽  
Author(s):  
Stefan Kopetz ◽  
Dengke Cai ◽  
Erik Rabe ◽  
Andreas Neyer
Keyword(s):  
Optical Waveguide ◽  
Waveguide Layer ◽  
Circuit Boards ◽  
Optical Circuit

Proposal of waveguide-type optical circuit for recognition of optical QPSK coded labels in photonic router

2008 ◽  
Author(s):  
Yoshihiro Makimoto ◽  
Hitoshi Hiura ◽  
Nobuo Goto ◽  
Shin-ichiro Yanagiya
Keyword(s):  
Optical Circuit ◽  
Waveguide Type
Sign in / Sign up

Export Citation Format

Share Document