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    • 25. 发明授权
    • Device noise measurement system
    • 设备噪声测量系统
    • US06320179B1
    • 2001-11-20
    • US09284634
    • 1999-04-15
    • Michael CoxNigel Copner
    • Michael CoxNigel Copner
    • H01J4014
    • H01S5/0014H01S3/0014
    • A system and method for determining noise power levels across a range of frequencies of the optical signal output from a device operating at a specified optical power and drive current and, in particular, for determining relative intensity noise values (RIN). The system may comprise a reference laser for generating an optical reference signal and a photodetector for converting the optical signal output from the reference laser and the device under test into equivalent electrical signals. The system also comprises means for measuring ac and dc components of the electrical signals output from the photodetector. The system may be used to measure RIN levels to an accuracy of less than 1 dB. Such measurements are of particular importance in the field of fiber optic telecommunications. The reference laser is shot noise limited in the frequency range of interest, typically between 20 MHz and 20 GHz, and has a narrow linewidth, typically less than 5 kHz. A shot noise limited reference laser signal may be achieved by means of optically attenuating a higher power reference laser signal to the required lower optical power. The incorporation of a reference laser enables a simple calibration process to take account of factors such as the responsivity, gain and resolution bandwidth of the system apparatus across the whole measurement range.
    • 一种用于确定在从指定光功率和驱动电流工作的装置输出的光信号的频率范围内的噪声功率电平的系统和方法,特别是用于确定相对强度噪声值(RIN)。 该系统可以包括用于产生光学参考信号的参考激光器和用于将从参考激光器和被测器件输出的光信号转换为等效电信号的光电检测器。 该系统还包括用于测量从光电检测器输出的电信号的交流和直流分量的装置。 该系统可用于测量RIN电平至小于1 dB的精度。 这样的测量在光纤通信领域中是特别重要的。 参考激光器在感兴趣的频率范围内被抛射噪声限制,通常在20MHz和20GHz之间,并且具有通常小于5kHz的窄线宽。 可以通过将较高功率参考激光信号光学衰减到所需的较低光功率来实现散粒噪声限制参考激光信号。 参考激光器的结合使得简单的校准过程能够考虑诸如系统装置在整个测量范围内的响应度,增益和分辨率带宽等因素。