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Proceedings Paper

Reduction of multipath interference in a few mode fibers using spatial filters
Author(s): Hao Wang; Shiva Kumar; Changqing Xu
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Paper Abstract

Multipath interference (MPI) is caused by the beating between a signal and its weak replica. In a few mode fibers, a replica of the signal propagates as a higher order mode. Since the optical path length of a higher order mode is different from the fundamental mode, it leads to interference pattern at the output end of the fiber, which degrades the system performance. In this paper, a simple method is proposed to reduce such kind of MPI effect by using a spatial filter in a 4F system. A higher order mode has higher spatial frequency components and therefore, choosing a low pass spatial filter with a suitable cutoff frequency, some part of the unwanted higher order mode can be suppressed and then MPI can be reduced. The idea is validated by simulation results.

Paper Details

Date Published: 20 September 2007
PDF: 6 pages
Proc. SPIE 6695, Optics and Photonics for Information Processing, 66950K (20 September 2007); doi: 10.1117/12.732594
Show Author Affiliations
Hao Wang, McMaster Univ. (Canada)
Shiva Kumar, McMaster Univ. (Canada)
Changqing Xu, McMaster Univ. (Canada)

Published in SPIE Proceedings Vol. 6695:
Optics and Photonics for Information Processing
Abdul A.S. Awwal; Khan M. Iftekharuddin; Bahram Javidi, Editor(s)

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