Tilted Gaussian Beams Multiplexer for Graded-Index Multimode Fiber in Data-Centers Interconnections

Author

Sheffi, N. ; Sadot, D.

Author_Institution

Dept. of Electr. & Comput. Eng., Ben Gurion Univ. of the Negev, Beer-Sheva, Israel

Volume

7

Issue

3

fYear

2015

fDate

Jun-15

Firstpage

1

Lastpage

16

Abstract

In recent years, there has been an explosive growth of data traffic in data-center interconnections. A significant amount of the installations within data centers are graded-index multimode fibers (GI-MMFs). These fibers enable the use of mode-division multiplexing to increase the fiber´s capacity. The heart of such a multiplexing scheme is a spatial multiplexer. In this paper, we propose a simple tilted Gaussian beam multiplexer for GI-MMF using low-cost commercially available lenses. We derive an analytical expression for the power coupling coefficients using a tilted Gaussian beam launch into a GI-MMF. We use the analytical expression to perform an optimization algorithm for tilted Gaussian beams as a spatial multiplexer with GI-MMF. The optimization was performed for 3 × 3, 4 × 4, and 5 × 5 multiple-input-multiple-output (MIMO) systems. Typical power coupling matrices exhibit maximum crosstalk of -12.5 dB with strong coupling efficiency that is greater than -0.6 dB.

Keywords

MIMO communication; computer centres; gradient index optics; laser beams; lenses; multiplexing equipment; optical communication equipment; optical crosstalk; optical fibre communication; optical fibre couplers; optical interconnections; optimisation; GI-MMF; MIMO systems; crosstalk; data traffic; data-centers interconnections; graded-index multimode fiber; lenses; mode division multiplexing; multiple-input-multiple-output systems; optimization; power coupling coefficients; spatial multiplexer; tilted Gaussian beams multiplexer; Couplings; MIMO; Multiplexing; Optical coupling; Optimization; Propagation constant; Refractive index; Graded-index multimode fiber (GI-MMF); mode division multiplexing (MDM); mode-division multiplexing (MDM); multiple-input multiple-output (MIMO); multipleinput- multiple-output (MIMO);

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2015.2434871

Filename

7109814