Multi-Core Fiber Precoder Mitigates Crosstalk
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Solution Overview
Problem
Multi-core fiber-based optical transmission systems face limitations due to core-dependent losses and crosstalk effects, which current solutions cannot optimally mitigate, leading to reduced performance and increased complexity.
Innovation Solution
An optical transmitter and receiver system that employs linear precoding techniques to precode information symbols using a precoding matrix determined by fiber parameters and misalignment loss values, reducing complexity and alleviating decoding operations without requiring channel state information or feedback links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-core fiber is used to increase transmission capacity, then bandwidth capacity is improved, but core-dependent losses and crosstalk effects worsen
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-applying a precoding matrix at the transmitter before signal transmission. This precoding matrix is determined based on fiber parameters and misalignment loss values, allowing the system to compensate for core-dependent losses and crosstalk effects in advance, thereby maintaining signal quality while utilizing multi-core fiber for high capacity transmission
2Reliability
If conventional solutions are used to mitigate core-dependent losses, then signal quality is improved, but system complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the transmission parameters through the precoding matrix, which is determined based on fiber parameters and misalignment loss values. This approach adjusts the signal parameters in a systematic way to compensate for losses without requiring complex additional hardware or multiple processing stages, thus improving signal quality while keeping system complexity manageable
3Measurement precision
If channel state information feedback is used for precoding, then decoding performance is improved, but system complexity and overhead increase
Solution Approach 1:
The patent applies self-service by determining the precoding matrix based on fiber parameters and misalignment loss values that are inherent to the transmission system itself, rather than requiring external feedback from channel state information. The system uses its own operational characteristics to generate the appropriate precoding, eliminating the need for complex feedback mechanisms while maintaining decoding performance
Data Source
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AI summary
The embodiments of the invention provide an optical transmitter (11) for transmitting a vector of information symbols over an optical fiber transmission channel (13) made of a multi-core fiber, optical signals carrying said vector of information symbols propagating along the multi-core fiber according to two or more cores, wherein the optical transmitter (11) comprises a precoder (87) configured to determine a precoding matrix depending on one or more fiber parameters associated with said multi-core fiber and to precode said vector of information symbols by multiplying the vector of information symbols by said precoding matrix.