Tool
DWDM / CWDM channel planner
DWDM channels follow ITU-T G.694.1, where frequency in terahertz is 193.1 plus the channel number times the grid spacing. Wavelength in nanometres is the speed of light divided by frequency. CWDM uses 18 fixed channels from 1271 to 1611 nm in 20 nm steps.
Enter channel numbers below. Everything is calculated in your browser from what you type.
Your channels
Plan
Convention varies by vendor. Here n=0 is 193.1 THz.
DWDM channels (100 GHz grid)
| n | Channel | Frequency | Wavelength |
|---|---|---|---|
| 0 | 31 | 193.100 THz | 1552.52 nm |
| 1 | 32 | 193.200 THz | 1551.72 nm |
| 2 | 33 | 193.300 THz | 1550.92 nm |
| 3 | 34 | 193.400 THz | 1550.12 nm |
How this is worked out
Every formula is shown and every input is yours to change. A planner with hidden maths is not a tool.
Channel naming varies by vendor. This planner uses the common 100 GHz convention where channel equals the frequency minus 190 divided by 0.1, so 193.1 THz is channel 31 at 1552.52 nm. The range is limited to C-band, about 191.3 to 196.1 THz.
CWDM channels are fixed by ITU-T G.694.2 at 20 nm spacing. There are 18 of them and they do not move with grid settings.
Questions
What does this tool do?
This tool helps engineers with dwdm / cwdm channel planner. Enter your own figures and everything is calculated in your browser.
Are my figures stored?
No. The calculation runs in your browser and nothing is sent to us.
How accurate is it?
It is exactly as accurate as the figures you put in. Treat it as a planning aid, not a precise measurement.
Is it free?
Yes. All DataOptix engineer tools are free with no login, no email gate and no cookies.
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