公开(公告)号：US20140341564A1

公开(公告)日：2014-11-20

申请号：US14273652

申请日：2014-05-09

Applicant: EXFO Inc.

Inventor： Mathias WESTLUND ,  Henrik SUNNERUD

IPC: H04B10/073 ,  H04B10/64 ,  H04B10/61

CPC classification number: H04B10/0731 ,  H04B10/614

Abstract: There are provided a method and a system for characterizing the CMRR of an ICR under test, which employ highly coherent light from two continuous-wave (CW) single-frequency lasers whose respective optical frequencies mutually differ by an offset defining an “Intermediate Frequency” (fIF) in the rf electrical baseband. The method involves the coherent mixing of light from these two lasers in the ICR under test. A “tone” in the rf electrical baseband at frequency fIF is generated by the beating of light from the two single-frequency lasers as they interfere on the photodetectors of the ICR. The resulting tone at frequency fIF in the output electrical signals of the ICR is then detected and analyzed to characterize the CMRR of the ICR.

Abstract translation: 提供了一种用于表征正在测试的ICR的CMRR的方法和系统，其使用来自两个连续波（CW）单频激光器的高度相干的光，其相应的光频率相互限定“中间频率” （fIF）在rf电基带。 该方法涉及在被测试的ICR中来自这两个激光器的光的相干混合。 频率为fIF的RF电基带中的“音调”通过来自两个单频激光器的光的抖动产生，因为它们干扰ICR的光电检测器。 然后检测和分析ICR的输出电信号中频率fIF产生的音调，以表征ICR的CMRR。