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Reducing group delay spread using uniform long-period gratings.

Huiyuan Liu1, He Wen1,2, Bin Huang1

  • 1CREOL, The College of Optics & Photonics, University of Central Florida, Orlando, FL, 32816, USA.

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|March 3, 2018
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Summary
This summary is machine-generated.

This study introduces long-period gratings (LPGs) to reduce digital signal processing (DSP) complexity in mode-division multiplexing (MDM) by inducing strong mode coupling and reducing modal dispersion.

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Area of Science:

  • Optical Communications
  • Photonics
  • Signal Processing

Background:

  • Mode-division multiplexing (MDM) offers significant transmission capacity increases but faces challenges.
  • Digital signal processing (DSP) complexity for compensating mode crosstalk and modal dispersion is a major hurdle in MDM implementation.

Purpose of the Study:

  • To propose and demonstrate a novel method for reducing DSP complexity in MDM.
  • To induce strong mode coupling and reduce group delay spread using uniform long-period gratings (LPGs).

Main Methods:

  • Utilizing uniform long-period gratings (LPGs) to induce strong mode coupling.
  • Optimizing fiber index profiles and the number of supported modes for LPG application.

Main Results:

  • Demonstrated effective mode coupling across all mode groups and a broad wavelength range using fixed-period LPGs.
  • Achieved significant reduction in insertion loss and mode-dependent loss.
  • Reduced group delay spread, a key factor in modal dispersion.

Conclusions:

  • Uniform LPGs provide an effective solution for reducing DSP complexity in MDM systems.
  • The proposed method enhances the practical feasibility of high-capacity optical communication systems.