研究目的
To propose a computationally efficient alternative to Half-Cycle subcarrier modulation based on an oversampled Nyquist pulse for short-reach optical communications.
研究成果
The proposed OVS-SCM system significantly reduces the computational load by 89% compared to HC-SCM and achieves an 18% higher spectral efficiency, making it a viable alternative for high data-rate short-reach IM/DD optical transmission.
研究不足
The HC-SCM scheme requires high-order raised cosine digital filters, leading to a high computational load. The proposed OVS-SCM reduces this load but may still face challenges in implementation complexity for higher modulation orders.
1：Experimental Design and Method Selection:
The study compares the performance of Half-Cycle (HC-SCM) and the proposed Oversampled Subcarrier Modulation (OVS-SCM) with experimental measurements in a short-length passive IM/DD optical link using high-order modulation formats such as 64, 128 and 256-QAM.
2：Sample Selection and Data Sources:
The experimental setup includes a field programmable gate array (FPGA), Xilinx FPGA evaluation board VC707, equipped with an Euvis DAC MD657B (12 bit) operating at
3：0 GS/s, and an E2V ADC EV10AQ190A (10 bits). List of Experimental Equipment and Materials:
The setup uses a low cost directly modulated laser (DML) operating at 1550 nm wavelength, 20 km of SSMF, an InGaAs PIN photodiode, and a low-pass filter (LPF).
4：Experimental Procedures and Operational Workflow:
The samples of the HC-SCM and OVS-SCM signals were generated in MATLAB, sent to the FPGA, converted to analog, transmitted through the optical fiber, converted back to electrical, sampled, and processed offline in Matlab.
5：Data Analysis Methods:
The performance was evaluated in terms of throughput, bit error rate (BER), error vector magnitude (EVM), and computational load (CL).
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