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DWDM Channel Chart – ITU DWDM Channels Grid

Posted at January 16, 2024 in by
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DWDM Channel Chart – ITU DWDM Channels Grid article covers DWDM band types, how channels are calculated and list of most used 100Ghz and 50Ghz DWDM channels.

 

DWDM (Dense Wavelength Division Multiplexing) is one of xWDM technologies that allow to achieve greater data throughput as it consists of many channels sending and receiving information over two SMF (Single-Mode Fiber) lines (one for sending, one for receiving). ITU-T G.694.1 is a recommendation standard that has been widely accepted and use for in DWDM applications and proposes channel spacing for 12.5 GHz, 25 GHz, 50 GHz, 100 GHz and above. DWDM channels are evenly spaced in range from 1260 nm to 1675 nm and categorized in bands and defined by:

 

  • Original O-Band 1260-1360 nm
  • Extended E-Band 1360-1460 nm
  • Short Wavelength S-Band 1460-1530 nm
  • Conventional C-Band 1530-1565 nm
  • Long Wavelength L-Band 1565-1625 nm
  • Ultralong Wavelength U-Band 1625-1675 nm

 

DWDM Channel Chart

 

Nowadays, 100 GHz DWDM C-Band based DWDM systems with use of DWDM Channel Chart 17 through to 61 are common practice. With 0.8 nm channel spacing (detailed channel list in DWDM ITU Grid 100GHz Channels table) as it is close to OS2 optimized wavelength of 1550 nm and allows for greater data transmission distances.

Channel wavelength can be extracted from frequency () and speed of light in vacuum constant as :

For example: Channel 17 – 191700 (GHz)

 

Also, worth noting is the correlation between channel and frequency in GHz as four last numbers denote ITU channel 17.00. To increase DWDM system data throughput 50GHz DWDM technology are of prominence as it provides the benefits of doubled channel capacity in C-band s channel spacing is of 0.4 nm which are noted in table – DWDM ITU Grid 50GHz Channels.

 

DWDM Channel Chart for 100GHz and 50GHz Systems:

ChannelFrequencyWavelengthChannelFrequencyWavelength

DWDM ITU Grid 100GHz Channels
# GHz nm # GHz nm
1 190100 1577.03 37 193700 1547.72
2 190200 1576.20 38 193800 1546.92
3 190300 1575.37 39 193900 1546.12
4 190400 1574.54 40 194000 1545.32
5 190500 1573.71 41 194100 1544.53
6 190600 1572.89 42 194200 1543.73
7 190700 1572.06 43 194300 1542.94
8 190800 1571.24 44 194400 1542.14
9 190900 1570.42 45 194500 1541.35
10 191000 1569.59 46 194600 1540.56
11 191100 1568.11 47 194700 1539.77
12 191200 1567.95 48 194800 1538.98
13 191300 1567.13 49 194900 1538.19
14 191400 1566.31 50 195000 1537.40
15 191500 1565.50 51 195100 1536.61
16 191600 1564.68 52 195200 1535.82
17 191700 1563.86 53 195300 1535.04
18 191800 1563.05 54 195400 1534.25
19 191900 1562.23 55 195500 1533.47
20 192000 1561.42 56 195600 1532.68
21 192100 1560.61 57 195700 1531.90
22 192200 1559.79 58 195800 1531.12
23 192300 1558.98 59 195900 1530.33
24 192400 1558.17 60 196000 1529.55
25 192500 1557.36 61 196100 1528.77
26 192600 1556.56 62 196200 1527.99
27 192700 1555.75 63 196300 1527.22
28 192800 1554.94 64 196400 1526.44
29 192900 1554.13 65 196500 1525.66
30 193000 1553.33 66 196600 1524.89
31 193100 1552.52 67 196700 1524.11
32 193200 1551.72 68 196800 1523.34
33 193300 1550.92 69 196900 1522.56
34 193400 1550.12 70 197000 1521.79
35 193500 1549.32 71 197100 1521.02
36 193600 1548.52 72 197200 1520.25

 

ChannelFrequencyWavelengthChannelFrequencyWavelength

DWDM ITU Grid 50GHz Channels
# GHz nm # GHz nm
1 190100 1577.03 37 193700 1547.72
1.5 190150 1576.61 37.5 193750 1547.32
2 190200 1576.20 38 193800 1546.92
2.5 190250 1575.78 38.5 193850 1546.52
3 190300 1575.37 39 193900 1546.12
3.5 190350 1574.95 39.5 193950 1545.72
4 190400 1574.54 40 194000 1545.32
4.5 190450 1574.13 40.5 194050 1544.92
5 190500 1573.71 41 194100 1544.53
5.5 190550 1573.30 41.5 194150 1544.13
6 190600 1572.89 42 194200 1543.73
6.5 190650 1572.48 42.5 194250 1543.33
7 190700 1572.06 43 194300 1542.94
7.5 190750 1571.65 43.5 194350 1542.54
8 190800 1571.24 44 194400 1542.14
8.5 190850 1570.83 44.5 194450 1541.75
9 190900 1570.42 45 194500 1541.35
9.5 190950 1570.01 45.5 194550 1540.95
10 191000 1569.59 46 194600 1540.56
10.5 191050 1569.18 46.5 194650 1540.16
11 191100 1568.11 47 194700 1539.77
11.5 191150 1568.36 47.5 194750 1539.37
12 191200 1567.95 48 194800 1538.98
12.5 191250 1567.54 48.5 194850 1538.58
13 191300 1567.13 49 194900 1538.19
13.5 191350 1566.72 49.5 194950 1537.79
14 191400 1566.31 50 195000 1537.40
14.5 191450 1565.90 50.5 195050 1537.00
15 191500 1565.50 51 195100 1536.61
15.5 191550 1565.09 51.5 195150 1536.22
16 191600 1564.68 52 195200 1535.82
16.5 191650 1564.27 52.5 195250 1535.43
17 191700 1563.86 53 195300 1535.04
17.5 191750 1563.45 53.5 195350 1534.64
18 191800 1563.05 54 195400 1534.25
18.5 191850 1562.64 54.5 195450 1533.86
19 191900 1562.23 55 195500 1533.47
19.5 191950 1561.83 55.5 195550 1533.07
20 192000 1561.42 56 195600 1532.68
20.5 192050 1561.01 56.5 195650 1532.29
21 192100 1560.61 57 195700 1531.90
21.5 192150 1560.20 57.5 195750 1531.51
22 192200 1559.79 58 195800 1531.12
22.5 192250 1559.39 58.5 195850 1530.72
23 192300 1558.98 59 195900 1530.33
23.5 192350 1558.58 59.5 195950 1529.94
24 192400 1558.17 60 196000 1529.55
24.5 192450 1557.77 60.5 196050 1529.16
25 192500 1557.36 61 196100 1528.77
25.5 192550 1556.96 61.5 196150 1528.38
26 192600 1556.56 62 196200 1527.99
26.5 192650 1556.15 62.5 196250 1527.60
27 192700 1555.75 63 196300 1527.22
27.5 192750 1555.34 63.5 196350 1526.83
28 192800 1554.94 64 196400 1526.44
28.5 192850 1554.54 64.5 196450 1526.05
29 192900 1554.13 65 196500 1525.66
29.5 192950 1553.73 65.5 196550 1525.27
30 193000 1553.33 66 196600 1524.89
30.5 193050 1552.93 66.5 196650 1524.50
31 193100 1552.52 67 196700 1524.11
31.5 193150 1552.12 67.5 196750 1523.72
32 193200 1551.72 68 196800 1523.34
32.5 193250 1551.32 68.5 196850 1522.95
33 193300 1550.92 69 196900 1522.56
33.5 193350 1550.52 69.5 196950 1522.18
34 193400 1550.12 70 197000 1521.79
34.5 193450 1549.72 70.5 197050 1521.40
35 193500 1549.32 71 197100 1521.02
35.5 193550 1548.91 71.5 197150 1520.63
36 193600 1548.52 72 197200 1520.25
36.5 193650 1548.11 72.5 197250 1519.86

 

DWDM systems also require a MUX and a DEMUX unit for operation for which more detailed information can be found at Single Fiber DWDM and Dobule Fiber DWDM.
More information for alternative xWDM solutions is available in CWDM Channel Plan and LWDM Channel Plan articles.