| 摘要 |
<p>The method involves measuring intensity of current at an opto-electrical converter, and measuring current by an analog-to-digital converter. A carrier-noise-ratio of the opto-electrical converter is calculated by a specific equation. A total carrier-noise ratio is calculated by addition of a carrier-noise ratio of signal source, a carrier-noise ratio of a transmission line without the converter and the carrier-noise ratio of the opto-electrical converter. A signal-to-noise ratio is calculated by addition of the total carrier-noise-ratio with a correction factor. An independent claim is also included for a device for determination of carrier-noise-ratio during carrier transmission in an optical transmission system.</p> |
