20 September 2007 Reduction of multipath interference in a few mode fibers using spatial filters
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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.
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Hao Wang, Hao Wang, Shiva Kumar, Shiva Kumar, Changqing Xu, Changqing Xu, } "Reduction of multipath interference in a few mode fibers using spatial filters", Proc. SPIE 6695, Optics and Photonics for Information Processing, 66950K (20 September 2007); doi: 10.1117/12.732594; https://doi.org/10.1117/12.732594
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