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Nonlinear interference noise in space-division multiplexed transmission through optical fibers
Optics Express
|August 10, 2017
Summary
We generalized the nonlinear interference noise (NLIN) model for multi-mode fiber systems. This new model accounts for modulation formats and mode-dependent loss, crucial for optimizing space-division multiplexing (SDM) networks.
Area of Science:
- Optical Communications
- Photonics
- Signal Processing
Background:
- Nonlinear interference noise (NLIN) is a significant challenge in optical fiber communication systems.
- Existing NLIN models are primarily developed for single-mode fiber (SMF) systems.
- Space-division multiplexing (SDM) offers increased capacity by utilizing multiple spatial modes within a fiber.
Purpose of the Study:
- To generalize the existing nonlinear interference noise (NLIN) model for single-mode fibers to multi-mode fiber (MMF) systems.
- To account for the modulation-format dependence of NLIN in SDM systems.
- To provide tools for extending NLIN analysis to SDM and understanding mode-dependent effects.
Main Methods:
- Generalization of the NLIN model from SMF to MMF scenarios.
- Inclusion of modulation-format dependence in the NLIN model.
- Analysis of the scaling of NLIN power with the number of transmitted modes.
- Investigation of the impact of mode-dependent loss (MD) on NLIN, Four-Wave Mixing (FWM), and Cross-Phase Modulation (XPM).
Main Results:
- A generalized NLIN model for SDM systems that incorporates modulation-format dependence.
- The model quantifies the scaling of NLIN power with the number of transmitted modes.
- Demonstration that mode-dependent loss (MD) significantly impacts NLIN in SDM systems.
- MD was shown to eliminate FWM contributions and suppress XPM effects.
Conclusions:
- The developed generalized NLIN model is essential for accurate analysis and optimization of SDM systems.
- Mode-dependent loss is a critical factor in SDM that cannot be ignored, unlike in SMF systems.
- Understanding and mitigating MD is crucial for maximizing the performance benefits of SDM.
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