研究目的
Investigating the effectiveness of 2X2 MIMO in implementing mode demultiplexing in a mode division multiplexing (MDM) system and comparing the equalization performance of LMS and NLMS algorithms.
研究成果
The study demonstrates that 2X2 MIMO can effectively implement mode demultiplexing in MDM systems. The NLMS algorithm shows more stable equalization performance compared to the LMS algorithm under the same power conditions. The findings suggest that MIMO equalization with adaptive step size can increase the transmission capacity of communication systems using MDM with few-mode fibers.
研究不足
The study is limited to a specific setup with an 80-meter few-mode fiber and a 12.5-Gbaud 16QAM signal. The comparison between LMS and NLMS algorithms is based on stability and convergence under the same power conditions.
1：Experimental Design and Method Selection:
The study employs LMS and NLMS algorithms for MIMO equalization in a MDM system using few-mode fibers (FMF).
2：Sample Selection and Data Sources:
A 12.5-Gbaud 16QAM transmission experiment is conducted over an 80-meter few-mode fiber.
3：5-Gbaud 16QAM transmission experiment is conducted over an 80-meter few-mode fiber.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: External cavity laser (ECL) at 1550nm, IQ modulator, AWG, mode multiplexer, polarization controller (PC), variable optical attenuator (VOA), coherent receivers, digital phosphor oscilloscope (DPO).
4：Experimental Procedures and Operational Workflow:
The optical signal is modulated, transmitted through FMF, demultiplexed, and received by coherent receivers. The received signals are digitized and processed offline using DSP.
5：Data Analysis Methods:
The performance of LMS and NLMS algorithms is evaluated based on convergence curves and bit error rate (BER) performance.
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