Stable optical MIMO transmission system over multimode fiber

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This patent describes a system for stable and efficient optical data transmission over multimode fiber (MMF) using multiple input, multiple output (MIMO) techniques. The system includes a network arrangement that monitors and equalizes signal power levels between different transmission modes (channels) of a multimode fiber, using dedicated power measurement units and an equalizer controlled by a power control unit. By maintaining balanced signal powers across modes, the system ensures reliable high-capacity optical communications with minimized channel interference and degradation.

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• Long-haul optical fiber communication systems for internet backbones or data centers.
• Submarine fiber optic cables for intercontinental data transmission.
• Enterprise and campus networks requiring high-speed optical connectivity.
• Telecommunications infrastructure upgrades from single-mode to higher-capacity multimode systems.
• Advanced research and supercomputing networks with large bandwidth demands.
• Upgrading existing multimode fiber networks to increase capacity and reliability.

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• Significantly increases data transmission capacity over a single optical fiber by utilizing multiple modes.
• Ensures stable and balanced transmission quality by automatically equalizing the power of each mode, reducing the risk of channel degradation.
• Reduces non-linear distortion effects, allowing for higher launch powers and longer transmission distances.
• Improves spectral efficiency, supporting more communication channels simultaneously within the same fiber infrastructure.
• Supports flexible integration with existing and new network elements such as amplifiers, switches, and multiplexers.
• Enables reliable MIMO processing at the receiver, improving signal recovery and minimizing data loss due to mode mixing or phase drifts.
• Offers scalability for future high-capacity network demands while leveraging existing multimode fiber infrastructure.

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Patent Abstract

The present document relates to optical transmission systems. In particular, it relates to multiple input, multiple output (MlM0) transmission over optical multimode fibers (MMF). A network arrangement (300) configured to equalize a first and a second mode in a multi-mode fiber (330, 331, 332) is described. The network arrangement (300) comprises a first power determination unit (321) configured to determine first power values associated with the first and the second mode (341) at a first network location; a second power determination unit (322) configured to determine second power values associated with the first and the second mode (342) at a second network location downstream of the first network location; a first equalizer (305) associated with the first mode and configured to change a power of the first mode (342) at the second network location; and a power control unit (320) configured to analyze the first and second power values determined by the first (321) and second (322) power determination unit; and configured to control the first equalizer (305).