Published by: Research & Development Department, Technologie Optic.ca Inc., June 2025
Dense Wavelength Division Multiplexing (DWDM) in the C-band with 100GHz spacing is a widely adopted technology in optical communication. It allows multiple optical carrier signals to be multiplexed onto a single optical fiber by using different wavelengths (frequencies) of laser light. The C-band (Conventional band) typically ranges from 1530 nm to 1565 nm and is favored due to its low attenuation and compatibility with Erbium-Doped Fiber Amplifiers (EDFAs).
The table below lists the ITU grid-based channel numbers, corresponding frequencies in THz, and wavelengths in nm for channels 1 to 72.
| Channel | Frequency (THz) | Wavelength (nm) |
|---|---|---|
| 1 | 190.100 | 1577.03 |
| 2 | 190.200 | 1576.20 |
| 3 | 190.300 | 1575.37 |
| 4 | 190.400 | 1574.54 |
| 5 | 190.500 | 1573.71 |
| 6 | 190.600 | 1572.89 |
| 7 | 190.700 | 1572.06 |
| 8 | 190.800 | 1571.24 |
| 9 | 190.900 | 1570.42 |
| 10 | 191.000 | 1569.59 |
| 11 | 191.100 | 1568.11 |
| 12 | 191.200 | 1567.95 |
| 13 | 191.300 | 1567.13 |
| 14 | 191.400 | 1566.31 |
| 15 | 191.500 | 1565.50 |
| 16 | 191.600 | 1564.68 |
| 17 | 191.700 | 1563.86 |
| 18 | 191.800 | 1563.05 |
| 19 | 191.900 | 1562.23 |
| 20 | 192.000 | 1561.41 |
| 21 | 192.100 | 1560.61 |
| 22 | 192.200 | 1559.79 |
| 23 | 192.300 | 1558.98 |
| 24 | 192.400 | 1558.17 |
| 25 | 192.500 | 1557.36 |
| 26 | 192.600 | 1556.55 |
| 27 | 192.700 | 1555.75 |
| 28 | 192.800 | 1554.94 |
| 29 | 192.900 | 1554.13 |
| 30 | 193.000 | 1553.33 |
| 31 | 193.100 | 1552.52 |
| 32 | 193.200 | 1551.72 |
| 33 | 193.300 | 1550.92 |
| 34 | 193.400 | 1550.12 |
| 35 | 193.500 | 1549.32 |
| 36 | 193.600 | 1548.51 |
| 37 | 193.700 | 1547.72 |
| 38 | 193.800 | 1546.92 |
| 39 | 193.900 | 1546.12 |
| 40 | 194.000 | 1545.32 |
| 41 | 194.100 | 1544.53 |
| 42 | 194.200 | 1543.73 |
| 43 | 194.300 | 1542.94 |
| 44 | 194.400 | 1542.14 |
| 45 | 194.500 | 1541.35 |
| 46 | 194.600 | 1540.56 |
| 47 | 194.700 | 1539.77 |
| 48 | 194.800 | 1538.98 |
| 49 | 194.900 | 1538.19 |
| 50 | 195.000 | 1537.40 |
| 51 | 195.100 | 1536.61 |
| 52 | 195.200 | 1535.82 |
| 53 | 195.300 | 1535.04 |
| 54 | 195.400 | 1534.25 |
| 55 | 195.500 | 1533.47 |
| 56 | 195.600 | 1532.68 |
| 57 | 195.700 | 1531.90 |
| 58 | 195.800 | 1531.12 |
| 59 | 195.900 | 1530.33 |
| 60 | 196.000 | 1529.55 |
| 61 | 196.100 | 1528.77 |
| 62 | 196.200 | 1527.99 |
| 63 | 196.300 | 1527.22 |
| 64 | 196.400 | 1526.44 |
| 65 | 196.500 | 1525.66 |
| 66 | 196.600 | 1524.89 |
| 67 | 196.700 | 1524.11 |
| 68 | 196.800 | 1523.34 |
| 69 | 196.900 | 1522.56 |
| 70 | 197.000 | 1521.79 |
| 71 | 197.100 | 1521.02 |
| 72 | 197.200 | 1520.25 |