Self-aligned micromachining process for large-scale, free-space optical cross-connects

2000 ◽  
Vol 18 (12) ◽  
pp. 1785-1791 ◽  
Author(s):  
P. Helin ◽  
M. Mita ◽  
T. Bourouina ◽  
G. Reyne ◽  
H. Fujita
Keyword(s):  
Free Space ◽  
Large Scale ◽  
Free Space Optical ◽  
Scale Free

Addendum to "Self-aligned micromachining process for large-scale, free-space optical cross-connects"

2001 ◽  
Vol 19 (11) ◽  
pp. 1793-1793
Author(s):  
P. Helin ◽  
M. Mita ◽  
T. Bourouina ◽  
G. Reyne ◽  
H. Fujita
Keyword(s):  
Free Space ◽  
Large Scale ◽  
Free Space Optical ◽  
Scale Free

scholarly journals Free Space Intra-Datacenter Interconnects Based on 2D Optical Beam Steering Enabled by Photonic Integrated Circuits

Photonics ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 21 ◽  
Author(s):  
Charidimos Chaintoutis ◽  
Behnam Shariati ◽  
Adonis Bogris ◽  
Paul Dijk ◽  
Chris Roeloffzen ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Integrated Circuit ◽  
Data Center ◽  
Free Space ◽  
Large Scale ◽  
Beam Steering ◽  
Optical Beam ◽  
Switching Network ◽  
Free Space Optical ◽  
Data Center Networks

Data centers are continuously growing in scale and can contain more than one million servers spreading across thousands of racks; requiring a large-scale switching network to provide broadband and reconfigurable interconnections of low latency. Traditional data center network architectures, through the use of electrical packet switches in a multi-tier topology, has fundamental weaknesses such as oversubscription and cabling complexity. Wireless intra-data center interconnection solutions have been proposed to deal with the cabling problem and can simultaneously address the over-provisioning problem by offering efficient topology re-configurability. In this work we introduce a novel free space optical interconnect solution for intra-data center networks that utilizes 2D optical beam steering for the transmitter, and high bandwidth wide-area photodiode arrays for the receiver. This new breed of free space optical interconnects can be developed on a photonic integrated circuit; offering ns switching at sub-μW consumption. The proposed interconnects together with a networking architecture that is suitable for utilizing those devices could support next generation intra-data center networks, fulfilling the requirements of seamless operation, high connectivity, and agility in terms of the reconfiguration time.

scholarly journals Urban Free-Space Optical Network Optimization

2020 ◽  
Vol 10 (21) ◽  
pp. 7872
Author(s):  
Revital Marbel ◽  
Boaz Ben-Moshe ◽  
Tal Grinshpoun
Keyword(s):  
Genetic Algorithm ◽  
Optical Networks ◽  
Free Space ◽  
Large Scale ◽  
Optimization Problems ◽  
Heuristic Method ◽  
Real Life ◽  
Free Space Optical ◽  
Time Performance ◽  
Run Time

This paper presents a set of graph optimization problems related to free-space optical communication networks. Such laser-based wireless networks require a line of sight to enable communication, thus a visibility graph model is used herein. The main objective is to provide connectivity from a communication source point to terminal points through the use of some subset of available intermediate points. To this end, we define a handful of problems that differ mainly in the costs applied to the nodes and/or edges of the graph. These problems should be optimized with respect to cost and performance. The problems at hand are shown to be NP-hard. A generic heuristic based on a genetic algorithm is proposed, followed by a set of simulation experiments that demonstrate the performance of the suggested heuristic method on real-life scenarios. The suggested genetic algorithm is compared with the Euclidean Steiner tree method. Our simulations show that in many settings, especially in dense graphs, the genetic algorithm finds lower-cost solutions than its competitor, while it falls behind in some settings. However, the run-time performance of the genetic algorithm is considerably better in graphs with 1000 nodes or more, being more than twice faster in some settings. We conclude that the suggested heuristic improves run-time performance on large-scale graphs and can handle a wider range of related optimization problems. The simulation results suggest that the 5G urban backbone may benefit significantly from using free-space optical networks.

scholarly journals Performance analysis of 349-element adaptive optics unit for a coherent free space optical communication system

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Leqiang Yang ◽  
Kainan Yao ◽  
Jianli Wang ◽  
Jingtai Cao ◽  
Xudong Lin ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Optical Communication ◽  
Free Space ◽  
High Speed ◽  
Large Scale ◽  
Mixing Efficiency ◽  
Free Space Optical Communication ◽  
Free Space Optical ◽  
Space Optical Communication ◽  
Continuous Surface

Abstract As a continuation of our previous work [Optics Express.25, 15229(2017)] in which we have verified the performance of a coherent free space optical communication (FSOC) system with a 97-element adaptive optics (AO) system, in this paper, we evaluated the performance improvement of the coherent FSOC system using a large-scale high-speed AO system with a 349-element continuous surface deformable mirror. The mixing efficiency (ME) and bit-error-rate (BER) under different Greenwood frequency (GF) were calculated as the performance metric of coherent FSOC system. The performance of FSOC system using such a large-scale AO system was quantitatively verified for the first time. The obtained results showed that the performance was obviously improved when a larger-scale high-speed AO system is employed in coherent FSOC system. This analysis result provides a performance verification for large-scale high-speed AO systems used in FSOC system which is beneficial for coherent FSOC system parameters design.

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