Abstract
We propose and experimentally demonstrate single-carrier adaptive frequency-domain equalization (SC-FDE) to mitigate multipath interference (MPI) for the transmission of the fundamental mode in a few-mode fiber. The FDE approach reduces computational complexity significantly compared to the time-domain equalization (TDE) approach while maintaining the same performance. Both FDE and TDE methods are evaluated by simulating long-haul fundamental-mode transmission using a few-mode fiber. For the fundamental mode operation, the required tap length of the equalizer depends on the differential mode group delay (DMGD) of a single span rather than DMGD of the entire link.
Highlights
The exponential growth of the internet requires a drastic increase of capacity of optical fiber communication systems
We propose and experimentally demonstrate single-carrier adaptive frequency-domain equalization (SC-FDE) to mitigate multipath interference (MPI) for the transmission of the fundamental mode in a fewmode fiber
The capacity of conventional optical transmission systems based on the single-mode fiber (SMF) has almost reached to the nonlinear Shannon limit
Summary
The exponential growth of the internet requires a drastic increase of capacity of optical fiber communication systems. The FMF can be designed to support only two mode groups and provide a large enough effective index difference between the two mode groups to suppress inter-mode coupling. Instead of suppressing inter-mode coupling using pure optical techniques, MPI is compensated using digital signal processing (DSP)-based adaptive equalization in the electronic domain at the receiver. This approach enables more flexibility in fiber design to allow a larger number of modes and larger effective areas.
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