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

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4 Author(s)
K. M. Patel ; Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA ; A. Polley ; K. Balemarthy ; S. E. Ralph

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.

Published in:

Journal of Lightwave Technology  (Volume:24 ,  Issue: 7 )