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分析了光纤承载无线(RoF,Radio over Fiber)外调制链路的噪声系数。通过建立数学模型,从小信号模型下推导出外部调制链路的增益和噪声系数的表达式,并研究了影响链路噪声系数的各种因素,如调制器的半波电压,输入光功率,光纤损耗,检测器的效率等,理论上得出降低噪声系数的一般方法和结论,即可以适当的降低调制器的半波偏置电压,提高激光器的输入光功率,可以选用低损耗光纤以及提高检测器的斜度效率等。
The noise figure of the externally modulated link of the RoF (Radio over Fiber) is analyzed. Through the establishment of the mathematical model, the expression of the gain and noise figure of the external modulation link is deduced from the small signal model, and the factors affecting the link noise figure are studied, such as the half-wave voltage of the modulator, the input optical power, Loss, the efficiency of the detector, the general theory and methods to reduce the noise figure and conclusions that can be properly reduced half-wave modulator bias voltage and improve the laser input optical power, you can use low-loss optical fiber and improve the detection The slope of the efficiency of the device.