Space-division multiplexing and MIMO processing

  • Fontaine N.
  • Ryf R.

of multiple parallel optical paths, is left. The general technique is referred to a space-division multiplexing (SDM), and is the obvious choice for any interconnection technology if the capacity of a single serial channel reaches a technological barrier. Space-division multiplexed system can be implemented by using multiple parallel SMFs, in this form however no significant reduction of cost-per-bit can be expected and therefore around 2009 a new research effort in fiber optics communication started with the aim of identifying cost efficient and scalable high capacity SDM fiber systems [6­8] Two fiber types of particular interest emerged: The multicore fibers (MCFs), where multiple fiber guiding cores are introduced in a common cladding area and multimode fibers (MMFs), where the fiber modes are exploited to transmit multiple parallel channels. Both fiber types are well known but the design was now revisited and optimized for high capacity transmission of parallel channels. All SDM transmission systems can essentially be divided in two categories depending on the way the multiple parallel channels are processed at the receiver. In uncoupled systems, each path is processed individually and any crosstalk from other channels will appear as an impairment limiting either the reach or the capacity of the individual channels. The second approach is based on joint processing of the signals from the multiple parallel paths. The transmission system can then be described as a multiple-input multiple-output (MIMO) channel and well known digital signal processing (DSP) techniques developed for wireless communication can be adopted.

Recent Publications

August 09, 2017

A Cloud Native Approach to 5G Network Slicing

  • Francini A.
  • Miller R.
  • Sharma S.

5G networks will have to support a set of very diverse and often extreme requirements. Network slicing offers an effective way to unlock the full potential of 5G networks and meet those requirements on a shared network infrastructure. This paper presents a cloud native approach to network slicing. The cloud ...

August 01, 2017

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
  • Wang H.
  • Wu Q.

Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

July 12, 2017

PrivApprox: Privacy-Preserving Stream Analytics

  • Chen R.
  • Christof Fetzer
  • Le D.
  • Martin Beck
  • Pramod Bhatotia
  • Thorsten Strufe

How to preserve users' privacy while supporting high-utility analytics for low-latency stream processing? To answer this question: we describe the design, implementation and evaluation of PRIVAPPROX, a data analytics system for privacy-preserving stream processing. PRIVAPPROX provides three properties: (i) Privacy: zero-knowledge privacy (ezk) guarantees for users, a privacy bound tighter ...