问题：
What is Extinction Ratio?
答案：
The ratio of the average power levels of the logic 1 level (High) to the logic 0 level (Low) of an optical signal. See the on-line Help, Automatic Measurements for more detailed discussion.
Also see Troubleshooting Automatic Measurements for examples of automatic measurements. It also has comments on compensation ("self-calibration"), Dark Level compensation and Extinction Ratio measurements.
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常见问题 ID 62901
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