Abstract

Multiple path interference (MPI) and differential modal delay (DMD) are two major impairments in fiber optic communication systems. MPI can be found in a few mode fibers in which a higher order mode propagates as a weak replica of the signal and interferes with the fundamental mode at the output of the fiber link. DMD in multimode fibers (MMF) leads to intersymbol interference, which limits the bit rate–distance product of the system. A simple method is proposed to reduce MPI and DMD effects using spatial filters in a 4F system. Higher order modes have higher spatial frequency components. Therefore by choosing a proper spatial filter with a suitable bandwidth, a fraction of the unwanted higher order modes can be suppressed, and therefore MPI and DMD effects can be reduced.

© 2008 Optical Society of America

Long-haul quasi-single-mode transmissions using few-mode fiber in presence of multi-path interference

Qi Sui, HongYu Zhang, John D. Downie, William A. Wood, Jason Hurley, Snigdharaj Mishra, Alan Pak Tao Lau, Chao Lu, Hwa-Yaw Tam, and P. K. A. Wai
Opt. Express 23(3) 3156-3169 (2015)

Low coherent hybrid detection technique for differential mode delay in a multimode optical fiber

J. Y. Lee, T.-J. Ahn, and D. Y. Kim
Appl. Opt. 47(6) 725-730 (2008)

Spatially and spectrally resolved imaging of modal content in large-mode-area fibers

J. W. Nicholson, A. D. Yablon, S. Ramachandran, and S. Ghalmi
Opt. Express 16(10) 7233-7243 (2008)

Determination of the differential mode delay of a multimode fiber using Fourier-domain intermodal interference analysis

J.Y. Lee and D.Y. Kim
Opt. Express 14(20) 9016-9021 (2006)

Raman amplification of pure side-seeded higher-order modes in hydrogen-filled hollow-core PCF

Jean-Michel Ménard, Barbara M. Trabold, Amir Abdolvand, and Philip St.J. Russell
Opt. Express 23(2) 895-901 (2015)