公开(公告)号：US20160047713A1

公开(公告)日：2016-02-18

申请号：US14783165

申请日：2013-09-16

Applicant: ZTE CORPORATION

Inventor： Meidong ZHU ,  Han XU ,  Jianzhang CHEN ,  Jianxin LU

IPC: G01M11/00 ,  H04B10/071

CPC classification number: G01M11/3109 ,  H04B10/071

Abstract: A zeroing method and zeroing device for an optical time-domain reflectometer (OTDR) are disclosed. The zeroing method includes: before starting the optical time-domain reflectometer, when a laser device is in an off state, sending a zeroing signal; and performing zeroing processing according to the zeroing signal. In the embodiments of the present invention, the feedback zeroing can be performed on a receiving circuit by utilizing the idle time prior to a test or during the test, thus the influence of an offset voltage is reduced, and a problem of operational-amplifier zero drift also can be solved in the meantime, which improves a detectability of the OTDR, and overcomes a disadvantage that a manual zeroing method is not intelligent and a measured waveform introduced in an automatic zeroing method is bad.

Abstract translation: 公开了一种用于光时域反射计（OTDR）的归零方法和调零装置。 归零方法包括：在启动光时域反射计之前，当激光装置处于关闭状态时，发送归零信号; 并根据归零信号进行归零处理。 在本发明的实施例中，可以通过利用测试之前的空闲时间或测试期间在接收电路上执行反馈归零，从而降低偏移电压的影响，并且运算放大器零点的问题 同时也可以解决漂移，这提高了OTDR的可检测性，克服了手动归零方法不智能，并且在自动归零方法中引入的测量波形不好的缺点。