公开(公告)号：EP0484913A2

公开(公告)日：1992-05-13

申请号：EP91118924.9

申请日：1991-11-06

Applicant: Hewlett-Packard Company

Inventor： Sorin, Wayne V. ,  Heffner, Brian L.

IPC: G01M11/00

CPC classification number: G01M11/3172 ,  G01B9/02002 ,  G01B9/02072 ,  G01B9/0209 ,  G01B2290/45 ,  G01B2290/70 ,  G01M11/3181

Abstract: An optical reflectometer for measuring an optical parameter of a device (12) under test. The reflectometer includes an interferometer having a light source (1) for providing a beam of light, a coupler (3) for dividing the beam of light into a reference signal and a test signal, an optical fiber (5) for applying the test signal to the device (12) and receiving a response signal therefrom. The coupler (3) combines the reference and response signals. The reflectometer also includes a polarization diversity receiver (14) having optical sensors (17v, 17h) responsive to optical signals of differing polarities for receiving the combined reference and response signals and an output circuit (21) for providing an output signal indicative of an optical parameter of the device (12). A polarization controller such as a linear polarizer (9) or a birefringent waveplate (23) controls the polarization of the reference signal to balance the sensor responses. The output signal is substantially independent of any polarization distortion introduced into the response signal by the device under test when the sensor responses have been balanced by the polarization controller.

Abstract translation: 一种用于测量被测设备（12）的光学参数的光学反射计。 该反射计包括：具有用于提供光束的光源（1）的干涉仪，用于将光束分成参考信号和测试信号的耦合器（3），用于施加测试信号的光纤（5） 到设备（12）并从其接收响应信号。 耦合器（3）结合了参考信号和响应信号。 该反射计还包括具有响应于不同极性的光信号以接收组合的参考和响应信号的光学传感器（17v，17h）的偏振分集接收器（14），以及用于提供表示光学的输出信号的输出电路（21） 装置（12）的参数。 诸如线偏振器（9）或双折射波片（23）的偏振控制器控制参考信号的偏振以平衡传感器响应。 当传感器响应已被偏振控制器平衡时，输出信号基本上与被测器件引入响应信号的任何偏振失真无关。