【摘要】 超荧光光纤光源(SFS)具有高稳定性,是光纤传感器(FOSs)中一种理想的光源。SFS光源的相对强度噪声(RIN)是影响FOSs性能的一个重要的因素。由于使用模拟抑制电路的噪声抑制系统无法很好的抑制RIN,文中提出了使用强度调制器的数字RIN抑制系统。为了验证此想法,建立了半实物仿真模型,该模型可以在中心频率处抑制RIN达到20 dB。该数字系统相对原有模拟系统,性能有了很大的提高,因此对FOSs性能的提高有很大的贡献。更多还原

【Abstract】 The superfluorescent fiber source(SFS) is an ideal source for fiber optic sensors(FOSs),because of the high stability. Relative intensity noise(RIN) of a SFS is proven to be an most important factor limiting the performance of FOSs. As the RIN cannot be suppressed effectively using an analog circuit, in this paper, a digital RIN suppressing system executed with intensity modulator was presented.To demonstrate this method, a semi-physical simulation was propose in which the RIN was reduced by20 dB at the center frequency. This method is more effective than the former analog one by simulation.This digital RIN suppressing system is of great value to improve the performances of FOSs.更多还原