Spatially resolved detection and equalization of modal dispersion limited multimode fiber links

Author

Patel, Ketan M. ; Polley, Arup ; Balemarthy, Kasyapa ; Ralph, Stephen E.

Author_Institution

Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA

Volume

24

Issue

7

fYear

2006

fDate

7/1/2006 12:00:00 AM

Firstpage

2629

Lastpage

2636

Abstract

The authors present theoretical and experimental results of an optoelectronic-equalization technique that mitigates intersymbol interference caused by differential modal delay in multimode fiber. By exploiting the spatial diversity of the transverse optical-fiber modes, the authors are able to provide a sufficient additional information in the form of mode-dependent photocurrents to enhance total signal integrity. A fabricated two-segment photodetector is demonstrated with a routinely achievable two-times improvement in bandwidth-distance product. They also show the robustness of the technique to the expected variations in graded-index profiles.

Keywords

delays; equalisers; gradient index optics; intersymbol interference; optical communication equipment; optical fibre communication; optical fibre dispersion; photoconductivity; photodetectors; telecommunication channels; differential mode delay; equalization; graded-index profiles; intersymbol interference; modal dispersion limited fiber links; mode-dependent photocurrents; multimode fiber links; optical channel equalization; optoelectronic equalization; spatially resolved detection; total signal integrity; transverse optical-fiber modes; two-segment photodetector; Delay; Intersymbol interference; Optical devices; Optical feedback; Optical fiber networks; Optical receivers; Optical transmitters; Photoconductivity; Photodetectors; Spatial resolution; Optical-fiber dispersion; optical receivers; optical-signal processing; optoelectronic devices;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2006.875239

Filename

1650539