RIN（相对强度噪声）是代表激光信号强度的时间波动的参数，并且用作激光装置的噪声特性的评估指标。RIN是指示数字和模拟光传输系统的信号质量必不可少的项目。
N4371A Agilent RIN测量系统采用专门开发的校准技术（正在申请专利）提供准确的RIN测量，该校准技术可用于整个系统的光电频率响应。安捷伦RIN测量系统还通过精确消除热噪声和散粒噪声的干扰，减少了不确定性。
RIN (Relative Intensity Noise) is a parameter representing temporal fluctuations of intensity of a laser signal and is used as an evaluation index of the noise characteristic of the laser devices. RIN is an indispensable item for indicating the signal quality of both digital and analog optical transmission systems.
N4371A Agilent RIN measurement system provides accurate RIN measurements with a specially developed calibration technique (patent pending) for the photoelectric frequency response of the entire system. Agilent RIN measurement system also reduces uncertainties by removing the interference by thermal noise and shot noise precisely.
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