The Optical Networking and Communication
Conference & Exhibition

San Diego Convention Center,
San Diego, California, USA

SC459 - Space Division Multiplexing Components and Devices

Sunday, 03 March
13:00 - 16:00

Short Course Level: Advanced Beginner


Nicolas Fontaine; Nokia Bell Labs, USA

Short Course Description:

This course is an introduction into components and devices that enable space-division multiplexing (SDM) over optical fibers supporting multiple spatial modes/cores. These devices include adaptations of single-mode devices such as wavelength selective switches and optical amplifiers and devices unique to SDM that do not have SMF equivalents such as mode multiplexers, adaptive optical multiple-input multiple-output processing, and mode delay/gain equalizers.

A basic understanding of the modal properties and the mode mixing properties of SDM fibers is necessary to design components. SDM fibers can have weak mode mixing, strong mode mixing, or a combination of both.  Strongly mixed systems present unique challenges for characterization which requires new measurements tools to determine the transfer matrix between the input spatial mode basis and the output spatial mode basis. In particular, the course will show how to use swept-wavelength interferometery with spatial diversity to measure these transfer matrices and how to use Eigen-analysis of the transfer matrix to extract the linear system parameters that affect the transmission performance such as mode dependent loss (MDL), mode averaged insertion loss, and differential group delay (DGD).

The course will cover a few components in detail:  design and scalability of photonic lantern and multi-plane light conversion mode multiplexers, implementation of spatial diversity and joint switching techniques inside wavelength selective switches, all optical multiple input multiple output processing and mode dependent gain minimization techniques for multimode optical fiber amplifiers. Note that this is a companion course to SC408, which will cover transmission aspects of SDM systems.

Short Course Benefits:

This course should enable you to:

  • Basic modal and mode coupling properties of standard SDM fibers such as multi-core, coupled-multi-core and multi-mode fiber and how these properties affect component design.

  • Design and fabrication of photonic lantern spatial multiplexers in 3D waveguide, or all fiber technology.

  • Design of multi-plane light conversion mode multiplexers.

  • Swept wavelength interferometry with spatial diversity for characterization of the transfer matrices of SDM systems.

  • List key properties of several types of mode multiplexers.

  • Spatial diversity techniques and joint switching for wavelength selective switches.

  • Techniques to minimize the mode dependent gain in Erbium doped multimode amplifiers.

Short Course Audience:

This course is intended for engineers, scientists, managers, technicians and students who want to learn about components used in space-division multiplexing systems.

Basic knowledge of fiber-optics communication and modal properties of waveguide is assumed. By the end of the course, the audience will know how to design several SDM components such as mode multiplexers, wavelength selective switches, and amplifiers

Instructor Biography:

Nicolas K. Fontaine is currently a Distinguished Member of the Technical Staff at Nokia Bell Labs. His main research interests are in space-division multiplexed transmission systems and components, wavelength selective switches and crossconnects, and spectral slice arbitrary waveform synthesis and measurement.

Sponsored by: