Reduction of multipath interference in a few mode fibers using spatial filters

Hao Wang; Shiva Kumar; Changqing Xu

doi:10.1117/12.732594

20 September 2007 Reduction of multipath interference in a few mode fibers using spatial filters

Hao Wang, Shiva Kumar, Changqing Xu

Proceedings Volume 6695, Optics and Photonics for Information Processing; 66950K (2007) https://doi.org/10.1117/12.732594
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

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.

Citation Download Citation

Hao Wang, Shiva Kumar, and 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); https://doi.org/10.1117/12.732594

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