研究目的
To propose a modified RZ-DQPSK modulation scheme for enhanced Q factor performance in optical fiber communication systems.
研究成果
The proposed modified RZ-DQPSK system shows enhanced Q factor performance, with optimal performance at 80% duty cycle for both SSMF and TW-RS fibers. The introduction of a carving signal significantly improves the signal quality by reducing chirp effect. Future research directions include suitability of fiber types for long-haul communication and analysis of multi-span systems with varying modulation techniques.
研究不足
The study is limited to simulative analysis and does not include experimental validation. The analysis is performed for single span of each fiber type and does not cover multi-span systems or terabit transmission.
1：Experimental Design and Method Selection:
The study involves a simulative analysis of a modified RZ-DQPSK modulation scheme using OPTSIM commercial software. The methodology includes the use of a carving modulator to reduce chirp effect and improve signal quality.
2：Sample Selection and Data Sources:
The analysis is performed on two types of commercial fibers: standard single-mode fiber (SSMF) and true wave-reduced slope (TW-RS) fiber.
3：List of Experimental Equipment and Materials:
The setup includes a DQPSK precoder, RZ driver, low-pass filter (LPF), optical laser source, carving modulator, EDFA, SMF, DCF, and BER estimator.
4：Experimental Procedures and Operational Workflow:
The optical signal is modulated with a carving signal before being transmitted through the fiber loop, which includes EDFA and SMF followed by DCF. The performance is measured using BER estimator.
5：Data Analysis Methods:
The performance is analyzed based on Q factor against OSNR for different duty cycles, and optical spectrum and eye pattern plots are examined.
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