| 单词 | nm (nanometer) |
| 释义 | nm (nanometer) One billionth (10-9, or 1⁄1,000,000,000) of a meter. The wavelength of an optical signal is measured in nanometers.The wavelength of a typical optical signal in a long haul fiber optic transmission system (FOTS) is in the 1550 nm window, for example. Just to put it in perspective, an average molecule is about a nanometer in diameter, a human DNA molecule is about 2.5 nm wide, and a human hair is in the range of 5,000–10,000 nm in diameter.A human fingernail grows about 1 nm per second. If you watch your fingernails grow for about 25 minutes and 50 seconds, you’ll have a sense for how long a wavelength is at 1550 nm. Note: It is much more exciting to watch grass grow, or even paint dry. |
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