研究目的
To construct and evaluate three types of 160 Gb/s all-optical digital comparators using quantum-dot semiconductor optical amplifiers (QD-SOAs) through numerical simulations, focusing on performance metrics such as extinction ratio (ER) and Q-factor, and to assess the impact of amplified spontaneous emission (ASE) noise.
研究成果
The investigation successfully constructed and evaluated three all-optical digital comparator configurations using QD-SOAs. Configurations (b) and (c) were found superior to (a) in terms of circuit complexity, ER value, and sensitivity to injection current. Both achieved high ER (>10 dB) and Q-factor (>9) even under intense ASE noise, demonstrating noise robustness. The choice between configurations depends on specific requirements, with (b) offering higher quality and (c) minimizing the number of QD-SOAs.
研究不足
The study is based on numerical simulations and does not include experimental validation. The configurations may have limitations in practical implementation due to complexity and sensitivity to parameters like injection current and ASE noise. Different wavelengths are required for some configurations, which could add complexity.
1：Experimental Design and Method Selection:
Numerical simulations were conducted using OptiSystem
2：2 and MATLAB R2018b to model the gain and phase dynamics of QD-SOAs. The simulations involved solving coupled equations for photon density, phase, and carrier dynamics using the 4th order Runge-Kutta method. Sample Selection and Data Sources:
Input signals were 160 Gb/s return-to-zero Gaussian pulses with 2 ps full width at half maximum (FWHM) and lengths of 256 bits generated by a pseudorandom binary sequence. Optical powers and wavelengths were specified for different configurations.
3：List of Experimental Equipment and Materials:
QD-SOAs with specific parameters (e.g., length, injection current), optical filters (Gaussian type with 3 nm bandwidth), and simulation software (OptiSystem
4：2, MATLAB R2018b) were used. Experimental Procedures and Operational Workflow:
The simulations involved propagating optical signals through QD-SOAs, applying optical filters, and analyzing outputs for extinction ratio and Q-factor. ASE noise was added numerically based on specified equations.
5：Data Analysis Methods:
Performance was evaluated using extinction ratio (ER) and Q-factor calculations, with results visualized through pseudo-eye diagrams (PEDs) and plots of ER and Q-factor versus spontaneous emission factor.
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