DWDM (full name: Dense Wavelength Division Multiplexing) is an optical multiplexing technology used to increase bandwidth over existing fiber networks.
DWDM works by combining and transmitting multiple signals simultaneously at different wavelengths on the same fiber. The technology creates multiple virtual fibers, thus multiplying the capacity of the physical medium.
WDM has revolutionized the cost per bit of transport.
DWDM, fiber networks can carry multiple Terabits of data per second over thousands of kilometers - at cost points unimaginable less than a decade ago. State-of-the-art DWDM systems support up to 192 wavelengths on a single pair of fiber, with each wavelength transporting up to 100Gbit/s capacity - 400Gbit/s and one Terabit/s on the horizon.

| ITU Channel Code | Wavelength | ITU Channel Code | Wavelength |
|---|---|---|---|
| 21 | 1560.61 | 41 | 1544.53 |
| 22 | 1559.79 | 42 | 1543.73 |
| 23 | 1558.98 | 43 | 1542.94 |
| 24 | 1558.17 | 44 | 1542.14 |
| 25 | 1557.36 | 45 | 1541.35 |
| 26 | 1556.55 | 46 | 1540.56 |
| 27 | 1555.75 | 47 | 1539.77 |
| 28 | 1554.94 | 48 | 1538.98 |
| 29 | 1554.13 | 49 | 1538.19 |
| 30 | 1553.33 | 50 | 1537.4 |
| 31 | 1552.52 | 51 | 1536.61 |
| 32 | 1551.72 | 52 | 1535.82 |
| 33 | 1550.92 | 53 | 1535.04 |
| 34 | 1550.12 | 54 | 1534.25 |
| 35 | 1549.32 | 55 | 1533.47 |
| 36 | 1548.51 | 56 | 1532.68 |
| 37 | 1547.72 | 57 | 1531.9 |
| 38 | 1546.92 | 58 | 1531.12 |
| 39 | 1546.12 | 59 | 1530.33 |
| 40 | 1545.32 | 60 | 1529.55 |


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