研究目的
To mitigate crosstalk in single-mode multicore fibers using optical space coding, specifically evaluating the effectiveness of the modified prime code and differential detection in reducing intercore crosstalk.
研究成果
The optical space coding scheme with modified prime code and differential detection effectively mitigates intercore crosstalk in multicore fibers, achieving improvements of 7–20 dB in 9-core fibers. The mitigation is more pronounced in fibers with uniform intercore couplings (e.g., type 4) and increases with code length (e.g., better improvements for N=25). The method avoids complex MIMO processing and bandwidth expansion, offering a simpler alternative for crosstalk reduction in SDM systems.
研究不足
The scheme requires that mean group delay differences between cores are negligible; if not, delay compensators are needed. It is sensitive to variations in intercore coupling coefficients (hrq), and environmental changes like temperature or pressure can affect performance. The method reduces the number of transmission signals (e.g., from N to N - sqrt(N) for reference signals set to zero), and it may not be fully effective for all core arrangements (e.g., types 2 and 3 show some deterioration).
1：Experimental Design and Method Selection:
The study employs an optical space coding scheme based on modified prime code (MPC) and differential detection to mitigate crosstalk in multicore fibers. The theoretical model involves matrix representations for space coding and intercore coupling, with simulations conducted to evaluate crosstalk reduction.
2：Sample Selection and Data Sources:
Four types of MCF models (hypothetical uniform, grid, circular, and island-like arrangements) are used, with intercore coupling coefficients (hrq) derived from core positions and assumed normal distributions.
3：List of Experimental Equipment and Materials:
Not explicitly detailed in the paper; based on the description, it involves optical encoders, decoders, differential detectors (PDs), and MCFs, but no specific models or brands are mentioned.
4：Experimental Procedures and Operational Workflow:
Light signals are launched into an encoder, split and combined based on MPC patterns, propagated through MCFs with intercore couplings, and detected using differential detectors to compute crosstalk. Simulations are performed with varying hrq and standard deviations.
5：Data Analysis Methods:
Crosstalk is calculated using derived equations (e.g., XT_wC and XT_w/oC), with results analyzed for mean values and distributions across different MCF types and core numbers.
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