Understanding DWDM ITU Channel
The standard ITU-T G.694.1 restricts DWDM (Dense Wavelength Division Multiplexing) operation wavelengths between 1528.77 nm to 1560.61 nm, which mainly corresponds to the C band. The CWDM ITU channel spacing is 100 GHz (0.8nm) for 40 channels.
- O-Band: 1270nm to 1370nm
- E-Band: 1371nm to 1470nm
- S-Band: 1471nm to 1530nm
- C-Band: 1531nm to 1570nm
- L-Band: 1571nm to 1611nm
Note: For 200GHz spacing use either odd or even numbered channels.
ITU Grid: C-Band, 100 GHz Spacing
| ITU Grid: C-Band, 100 GHz Spacing | ||
| DWDM ITU Channel | Wavelength (in nm) | Frequency (in THz) |
| 72 (DWDM Channel C72) | 1520.25 | 197.20 |
| 71 (DWDM Channel C71) | 1521.02 | 197.10 |
| 70 (DWDM Channel C70) | 1521.79 | 197.00 |
| 69 (DWDM Channel C69) | 1522.56 | 196.90 |
| 68 (DWDM Channel C68) | 1523.34 | 196.80 |
| 67 (DWDM Channel C67) | 1524.11 | 196.70 |
| 66 (DWDM Channel C66) | 1524.89 | 196.60 |
| 65 (DWDM Channel C65) | 1525.66 | 196.50 |
| 64 (DWDM Channel C64) | 1526.44 | 196.40 |
| 63 (DWDM Channel C63) | 1527.22 | 196.30 |
| 62 (DWDM Channel C62) | 1527.99 | 196.20 |
| 61 (DWDM Channel C61) | 1528.77 | 196.10 |
| 60 (DWDM Channel C60) | 1529.55 | 196.00 |
| 59 (DWDM Channel C59) | 1530.33 | 195.90 |
| 58 (DWDM Channel C58) | 1531.12 | 195.80 |
| 57 (DWDM Channel C57) | 1531.90 | 195.70 |
| 56 (DWDM Channel C56) | 1532.68 | 195.60 |
| 55 (DWDM Channel C55) | 1533.47 | 195.50 |
| 54 (DWDM Channel C54) | 1534.25 | 195.40 |
| 53 (DWDM Channel C53) | 1535.04 | 195.30 |
| 52 (DWDM Channel C52) | 1535.82 | 195.20 |
| 51 (DWDM Channel C51) | 1536.61 | 195.10 |
| 50 (DWDM Channel C50) | 1537.40 | 195.00 |
| 49 (DWDM Channel C49) | 1538.19 | 194.90 |
| 48 (DWDM Channel C48) | 1538.98 | 194.80 |
| 47 (DWDM Channel C47) | 1539.77 | 194.70 |
| 46 (DWDM Channel C46) | 1540.56 | 194.60 |
| 45 (DWDM Channel C45) | 1541.35 | 194.50 |
| 44 (DWDM Channel C44) | 1542.14 | 194.40 |
| 43 (DWDM Channel C43) | 1542.94 | 194.30 |
| 42 (DWDM Channel C42) | 1543.73 | 194.20 |
| 41 (DWDM Channel C41) | 1544.53 | 194.10 |
| 40 (DWDM Channel C40) | 1545.32 | 194.00 |
| 39 (DWDM Channel C39) | 1546.12 | 193.90 |
| 38 (DWDM Channel C38) | 1546.92 | 193.80 |
| 37 (DWDM Channel C37) | 1547.72 | 193.70 |
| 36 (DWDM Channel C36) | 1548.51 | 193.60 |
| 35 (DWDM Channel C35) | 1549.32 | 193.50 |
| 34 (DWDM Channel C34) | 1550.12 | 193.40 |
| 33 (DWDM Channel C33) | 1550.92 | 193.30 |
| 32 (DWDM Channel C32) | 1551.72 | 193.20 |
| 31 (DWDM Channel C31) | 1552.52 | 193.10 |
| 30 (DWDM Channel C30) | 1553.33 | 193.00 |
| 29 (DWDM Channel C29) | 1554.13 | 192.90 |
| 28 (DWDM Channel C28) | 1554.94 | 192.80 |
| 27 (DWDM Channel C27) | 1555.75 | 192.70 |
| 26 (DWDM Channel C26) | 1556.55 | 192.60 |
| 25 (DWDM Channel C25) | 1557.36 | 192.50 |
| 24 (DWDM Channel C24) | 1558.17 | 192.40 |
| 23 (DWDM Channel C23) | 1558.98 | 192.30 |
| 22 (DWDM Channel C22) | 1559.79 | 192.20 |
| 21 (DWDM Channel C21) | 1560.61 | 192.10 |
| 20 (DWDM Channel C20) | 1561.42 | 192.00 |
| 19 (DWDM Channel C19) | 1562.23 | 191.90 |
| 18 (DWDM Channel C18) | 1563.05 | 191.80 |
| 17 (DWDM Channel C17) | 1563.86 | 191.70 |
| 16 (DWDM Channel C16) | 1564.68 | 191.60 |
| 15 (DWDM Channel C15) | 1565.50 | 191.50 |
| 14 (DWDM Channel C14) | 1566.31 | 191.40 |
| 13 (DWDM Channel C13) | 1567.13 | 191.30 |
| 12 (DWDM Channel C12) | 1567.95 | 191.20 |
| 11 (DWDM Channel C11) | 1568.67 | 191.10 |
| 10 (DWDM Channel C10) | 1569.59 | 191.00 |
| 9 (DWDM Channel C09) | 1570.42 | 190.90 |
| 8 (DWDM Channel C08) | 1571.24 | 190.80 |
| 7 (DWDM Channel C07) | 1572.06 | 190.70 |
| 6 (DWDM Channel C06) | 1572.89 | 190.60 |
| 5 (DWDM Channel C05) | 1573.71 | 190.50 |
| 4 (DWDM Channel C04) | 1574.54 | 190.40 |
| 3 (DWDM Channel C03) | 1575.37 | 190.30 |
| 2 (DWDM Channel C02) | 1576.20 | 190.20 |
| 1 (DWDM Channel C01) | 1577.03 | 190.10 |