Decibels per kilometer to nepers per kilometer
Type a value in dB/km to get it in Np/km instantly.
0.02303Np/km
That's about the same as single-mode fiber at 1550 nm. After about 50 km only a tenth of the power is left.
What it means
How lossy is that?
Cable loss rises with frequency, so a datasheet figure always belongs to a stated frequency. Fiber loss depends on the wavelength instead.
The math
How to convert dB/km to Np/km
To convert decibels per kilometer to nepers per kilometer, multiply by 0.115129.
Example: 0.2 dB/km × 0.115129 = 0.0230259 Np/km.
In the other direction, 1 Np/km = 8.68589 dB/km.
Every unit
Your attenuation in every unit
Tables
dB/km to Np/km conversion table
| dB/km | Np/km |
|---|---|
| 0.1 dB/km | 0.0115129 Np/km |
| 0.2 dB/km | 0.0230259 Np/km |
| 0.5 dB/km | 0.0575646 Np/km |
| 1 dB/km | 0.115129 Np/km |
| 5 dB/km | 0.575646 Np/km |
| 10 dB/km | 1.15129 Np/km |
| 25 dB/km | 2.87823 Np/km |
| 50 dB/km | 5.75646 Np/km |
| 100 dB/km | 11.5129 Np/km |
| 200 dB/km | 23.0259 Np/km |
| 500 dB/km | 57.5646 Np/km |
Np/km to dB/km conversion table
| Np/km | dB/km |
|---|---|
| 0.1 Np/km | 0.868589 dB/km |
| 0.2 Np/km | 1.73718 dB/km |
| 0.5 Np/km | 4.34294 dB/km |
| 1 Np/km | 8.68589 dB/km |
| 5 Np/km | 43.4294 dB/km |
| 10 Np/km | 86.8589 dB/km |
| 25 Np/km | 217.147 dB/km |
| 50 Np/km | 434.294 dB/km |
| 100 Np/km | 868.589 dB/km |
| 200 Np/km | 1,737.18 dB/km |
| 500 Np/km | 4,342.94 dB/km |
Quick answers
Quick answers
- How many Np/km is 1 dB/km?
- 1 dB/km is 0.115129 Np/km.
- How many Np/km is 10 dB/km?
- 10 dB/km is 1.15129 Np/km.
- How many Np/km is 0.2 dB/km?
- 0.2 dB/km is 0.0230259 Np/km.
The units
About these units
Decibels per kilometer (dB/km)
The standard for optical fiber.
Nepers per kilometer (Np/km)
The natural-log form used in transmission line theory.
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