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DWDM/CWDM Wavelength ITU Channels Guide

Updated on May 4, 2023 by
86.3k

10G DWDM/CWDM SFP+

In the rapidly evolving field of optical communications, mastering wavelength management is crucial. This comprehensive guide provides the essential knowledge to navigate ITU channel grids, choose the right transceiver modules, and optimize your fiber optic network. Whether you are an experienced professional or a newcomer, this guide will help you fully leverage DWDM and CWDM technologies.

Table of Contents

DWDM

DWDM 100GHz ITU Grid

DWDM 50GHz ITU Grid

40KM DWDM Modules

80KM DWDM Modules

100KM DWDM Modules

FS DWDM Mux/Demux

CWDM

CWDM ITU Grid

20KM CWDM Modules

40KM CWDM Modules

80KM CWDM Modules

120KM CWDM Modules

FS CWDM Mux/Demux

DWDM ITU Channels Overview

The DWDM region, as defined by the ITU G.694.1 standard, spans from 1528.77 nm to 1563.86 nm, mainly within the C band. DWDM channel plans may vary, but a common setup includes either 40 channels with 100 GHz (0.8 nm) spacing or 80 channels with 50 GHz (0.4 nm) spacing. Currently, DWDM systems operating within the 100 GHz DWDM C-Band typically follow a channel plan ranging from channels 17 to 61. For a more detailed overview, please refer to the DWDM Channel List below, which provides specific wavelengths and frequency intervals for each channel.

DWDM 100GHz ITU Grid

Channel Frequency Wavelength Channel Frequency Wavelength
# GHz nm # GHz nm
1 190100 1577.03 37 193700 1547.72
2 190200 1576.2 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 1537.4
15 191500 1565.5 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 1561.41 56 195600 1532.68
21 192100 1560.61 57 195700 1531.9
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 1556.55 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 1548.51 72 197200 1520.25

DWDM 50GHz ITU Grid

Channel Frequency Wavelength Channel Frequency Wavelength
# GHz nm # GHz nm
1 190.1 1577.03 37 193.7 1547.72
1.5 190.15 1576.61 37.5 193.75 1547.32
2 190.2 1576.2 38 193.8 1546.92
2.5 190.25 1575.78 38.5 193.85 1546,52
3 190.3 1575.37 39 193.9 1546,12
3.5 190.35 1574.95 39.5 193.95 1545.72
4 190.4 1574.54 40 194 1545.32
4.5 190.45 1574.13 40.5 194.05 1544.92
5 190.5 1573.71 41 194.1 1544.53
5.5 190.55 1573.3 41.5 194.15 1544.13
6 190.6 1572.89 42 194.2 1543.73
6.5 190.65 1572.48 42.5 194.25 1543.33
7 190.7 1572.06 43 194.3 1542.94
7.5 190.75 1571.65 43.5 194.35 1542.54
8 190.8 1571.24 44 194.4 1542.14
8.5 190.85 1570.83 44.5 194.45 1541.75
9 190.9 1570.42 45 194.5 1541.35
9.5 190.95 1570.01 45.5 194.55 1540.95
10 191 1569.59 46 194.6 1540.56
10.5 191.05 1569.18 46.5 194.65 1540.16
11 191.1 1568.11 47 194.7 1539.77
11.5 191.15 1568.36 47.5 194.75 1539.37
12 191.2 1567.95 48 194.8 1538.98
12.5 191.25 1567.54 48.5 194.85 1538.58
13 191.3 1567.13 49 194.9 1538.19
13.5 191.35 1566.72 49.5 194.95 1537.79
14 191.4 1566.31 50 195 1537.4
14.5 191.45 1565.9 50.5 195.05 1537
15 191.5 1565.5 51 195.1 1536.61
15.5 191.55 1565.09 51.5 195.15 1536.22
16 191.6 1564.68 52 195.2 1535.82
16.5 191.65 1564.27 52.5 195.25 1535.43
17 191.7 1563.86 53 195.3 1535.04
17.5 191.75 1563.45 53.5 195.35 1534.64
18 191.8 1563.05 54 195.4 1534.25
18.5 191.85 1562.64 54.5 195.45 1533.86
19 191.9 1562.23 55 195.5 1533.47
19.5 191.95 1561.83 55.5 195.55 1533.07
20 192 1561.42 56 195.6 1532.68
20.5 192.05 1561.01 56.5 195.65 1532.29
21 192.1 1560.61 57 195.7 1531.9
21.5 192.15 1560.2 57.5 195.75 1531.51
22 192.2 1559.79 58 195.8 1531.12
22.5 192.25 1559.39 58.5 195.85 1530.72
23 192.3 1558.98 59 195.9 1530.33
23.5 192.35 1558.58 59.5 195.95 1529.94
24 192.4 1558.17 60 196 1529.55
24.5 192.45 1557.77 60.5 196.05 1529.16
25 192.5 1557.36 61 196.1 1528.77
25.5 192.55 1556.96 61.5 196.15 1528.38
26 192.6 1556.56 62 196.2 1527.99
26.5 192.65 1556.15 62.5 196.25 1527.6
27 192.7 1555.75 63 196.3 1527.22
27.5 192.75 1555.34 63.5 196.35 1526.83
28 192.8 1554.94 64 196.4 1526.44
28.5 192.85 1554.54 64.5 196.45 1526.05
29 192.9 1554.13 65 196.5 1525.66
29.5 192.95 1553.73 65.5 196.55 1525.27
30 193 1553.33 66 196.6 1524.89
30.5 193.05 1552.93 66.5 196.65 1524.5
31 193.1 1552.52 67 196.7 1524.11
31.5 193.15 1552.12 67.5 196.75 1523.72
32 193.2 1551.72 68 196.8 1523.34
32.5 193.25 1551.32 68.5 196.85 1522.95
33 193.3 1550.92 69 196.9 1522.56
33.5 193.35 1550.52 69.5 196.95 1522.18
34 193.4 1550.12 70 197 1521.79
34.5 193.45 1549.72 70.5 197.05 1521.4
35 193.5 1549.32 71 197.1 1521.02
35.5 193.55 1548.91 71.5 197.15 1520.63
36 193.6 1548.52 72 197.2 1520.25
36.5 193.65 1548.11 72.5 197.25 1519.86

FS DWDM Transceiver Modules Quick View

FS DWDM transceivers are available with C17-C61 100 GHz DWDM wavelengths, and C17-C61 50 Ghz DWDM wavelengths, including DWDM SFP, DWDM SFP+, DWDM XFP, and Tunable DWDM transceivers that support transmission distance up to 100 km. Tunable DWDM transceivers are able to support a specific channel in a DWDM optical network, allowing for remotely wavelengths change in software.

40KM DWDM Modules

DWDM SFP 40KM, 100 Ghz

DWDM SFP+ 40KM, 100 GHz

DWDM XFP 40KM, 100 GHz

80KM DWDM Modules

DWDM SFP 80KM, 100 GHz

DWDM SFP+ 80KM, 100 Ghz

Tunable DWDM SFP+ 80KM, 50 Ghz

DWDM XFP 80KM, 100 GHz

Tunable DWDM XFP 80KM, 50 Ghz

100KM DWDM Modules

DWDM SFP 100KM

FS DWDM Mux/Demux

DWDM Mux/Demux is made to multiplex and demultiplex multiple DWDM channels into one or two fibers. It can extend the bandwidth of optical communication network with low cost and long transmission distance up to 1000 kilometers, which makes it an ideal long-haul network solution. FS offers DWDM Mux/Demux in different channal numbers and single or dual fiber types.

Product Description Line Type Wavelength Channel Spacing (GHz)
8CH DWDM Mux/Demux Dual Fiber C21-C28, C53-C60 100
Single Fiber C21-C35, C22-C36 100
16CH DWDM Mux/Demux Dual Fiber C17-C32, C21-C36, C27-C42, C43-C58 100
40CH DWDM Mux/Demux Dual Fiber C21-C60 100
96CH DWDM Mux/Demux Dual Fiber C15-C62.5 50

Mux Demux and OADM

CWDM ITU Channels Overview

ITU-T G.694.2 defines 18 wavelengths for CWDM transport ranging from 1270 to 1610 nm, spaced at 20 nm apart. The complete CWDM ITU grid is shown below in the CWDM channel chart. Each CWDM channel is transparent to the speed and type of data, meaning that any mix of SAN, WAN, voice, and video services can be transported simultaneously over a single fiber or fiber pair.

CWDM Channels
ITU Channel No. Wavelength (nm) Latch Color by Wavelength
27 1270  
29 1290  
31 1310  
33 1330  
35 1350  
37 1370  
39 1390  
41 1410  
43 1430  
45 1450  
47 1470  
49 1490  
51 1510  
53 1530  
55 1550  
57 1570  
59 1590  
61 1610  

FS CWDM Transceiver Modules Quick View

FS CWDM transceivers are available with all 18 CWDM wavelengths, including CWDM SFP, CWDM SFP+, CWDM XFP and 3G SDI CWDM SFP modules. These CWDM transceivers can be applied in data transmission spanning 20 km to 120 km.

20KM CWDM Modules

CWDM SFP 20KM

CWDM SFP+ 20KM

CWDM XFP 20KM

40KM CWDM Modules

CWDM SFP 40KM

CWDM SFP+ 40KM

CWDM XFP 40KM

3G SDI CWDM SFP 40KM

80KM CWDM Modules

CWDM SFP 80KM

CWDM SFP+ 80KM

CWDM XFP 80KM

120KM CWDM Modules

CWDM SFP 120KM

FS CWDM Mux/Demux

In addition to the various CWDM transceivers, FS also provides a wide range of CWDM Mux/Demux, which acts as the major building block in network expansion and upgrade. FS CWDM Mux/Demux comes in several different types in regard to line type, channel number, and special port.

Product Description Line Type Wavelength
4CH CWDM Mux/Demux Dual Fiber 1270-1330nm, 1510-1570nm
Single Fiber 1470-1590nm, 1490-1610nm
8CH CWDM Mux/Demux Dual Fiber 1290-1430nm, 1430-1570nm, 1470-1610nm, 1270-1450nm (Skip 1390, 1410nm)
9CH CWDM Mux/Demux Single Fiber 1270-1590nm, 1270-1610nm, 1290-1610nm
18CH CWDM Mux/Demux Dual Fiber 1270-1610nm

Mux Demux and OADM

FAQs about DWDM/CWDM Wavelength Channels

Q1: How Does the Scalability Potential of DWDM and CWDM Differ?

CWDM offers support for 18 channels, making it suitable for moderate bandwidth over shorter distances. On the other hand, DWDM provides high scalability with 96 channels, owing to its finer channel spacing and broader wavelength range, thus catering to large-scale networks with high bandwidth demands and longer transmission distances.

Q2: When Considering Between DWDM/CWDM and Deploying More Fibers, What Factors Should Be Weighed?

The optimal choice depends on project-specific needs. While deploying more fibers may seem simpler, it comes with limitations on scalability and physical space. Conversely, DWDM/CWDM offers scalability and more efficient utilization of fiber resources.

Q3: What Are the Advantages of Single vs. Dual Fiber Passive Setups in DWDM or CWDM Systems?

Dual fiber setups typically offer twice as many channels compared to single fiber setups, making them a preferred choice. However, single fiber configurations may be considered if there are constraints on fiber availability.

Q4: How Do the 10 G, 25 G, and 100 G Solutions for Long-Distance Traffic in DWDM/CWDM Networks Differ?

The choice between 10 G, 25 G, and 100 G solutions depends on bandwidth requirements, scalability, and the availability of transceivers capable of reaching desired distances. For instance, while 10 G setups are suitable for distances up to about 80 km, 25 G solutions can reach 20-30 km, albeit with limited availability for longer distances. Meanwhile, 100 G passive setups are feasible within specific ranges and may require amplification techniques for longer distances.

Conclusion

DWDM and CWDM technologies are indispensable for expanding fiber optic networks, efficiently meeting the escalating demands of data transmission while maximizing existing infrastructure. This article comprehensively covers ITU channel grids, optical transceiver modules, transmission distances, and multiplexing/demultiplexing products provided by FS. Additionally, it includes detailed information about the ITU channel list. These advancements not only enhance network bandwidth and extend transmission ranges but also drive down operational costs. Whether establishing long-haul backbone networks or optimizing metropolitan area networks (MAN), the selection of the appropriate DWDM or CWDM solution significantly influences performance and scalability. We strive for this guide to provide invaluable insights and guidance for navigating complex fiber optic environments successfully. Should you require further technical support or have inquiries, please don't hesitate to contact our expert team.

Related Articles:

CWDM (Coarse Wavelength Division Multiplexing)

DWDM (Dense Wavelength Division Multiplexing)

CWDM vs DWDM

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