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O-band wavelenght plan

Posted at November 30, 2024 in by
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The original band, or O-band DWDM (Dense Wavelength Division Multiplexing), refers to the band of optical wavelengths that range from 1260 to 1360 nm. The name – original band – is derived from its status as the primary telecommunication wavelength for optical communication channels. This band is often used for short-distance optical communication due to its low chromatic dispersion in standard single-mode fiber (SMF).

In our DWDM Channel Chart article, we explain the ITU DWDM Channel band types and how they are calculated. Nevertheless, repetition is the mother of knowledge, so here you can see the full band spectrum:

o band wavelength

Key Characteristics of O-band DWDM:

  • Wavelength Range: 1260–1360 nm;
  • Channel Spacing: Commonly 200 GHz (1.6 nm) or 100 GHz (0.8 nm) is used, though tighter spacings (50 GHz or 25 GHz) may be possible with advanced technology;
  • Applications: Used in data centers and access networks, where low dispersion is advantageous.

O-band DWDM Channel Chart for 200GHz and 100GHz Systems

O-BAND DWDM ITU Grid 100GHz Channels
# GHz nm # GHz nm
1 238900 1254.55 36 235400 1284.15
2 238800 1255.37 37 235300 1285.02
3 238700 1256.21 38 235200 1285.88
4 238600 1257.03 39 235100 1286.75
5 238500 1257.86 40 235000 1287.61
6 238400 1258.70 41 234900 1288.48
7 238300 1259.53 42 234800 1289.35
8 238200 1260.36 43 234700 1290.22
9 238100 1261.20 44 234600 1291.09
10 238000 1262.04 45 234500 1291.96
11 237900 1262.87 46 234400 1292.84
12 237800 1263.71 47 234300 1293.71
13 237700 1264.56 48 234200 1294.59
14 237600 1265.40 49 234100 1295.47
15 237500 1266.24 50 234000 1296.34
16 237400 1267.09 51 233900 1297.22
17 237300 1267.93 52 233800 1298.10
18 237200 1268.78 53 233700 1298.99
19 237100 1269.62 54 233600 1299.87
20 237000 1270.47 55 233500 1300.75
21 236900 1271.32 56 233400 1301.64
22 236800 1272.17 57 233300 1302.52
23 236700 1273.02 58 233200 1303.41
24 236600 1273.87 59 233100 1304.30
25 236500 1274.72 60 233000 1305.19
26 236400 1275.57 61 232900 1306.08
27 236300 1276.43 62 232800 1306.97
28 236200 1277.28 63 232700 1307.86
29 236100 1278.14 64 232600 1308.76
30 236000 1279.00 65 232500 1309.65
31 235900 1279.85 66 232400 1310.55
32 235800 1280.71 67 232300 1311.45
33 235700 1281.57 68 232200 1312.34
34 235600 1282.43 69 232100 1313.24
35 235500 1283.29 70 232000 1314.15

200GHz spacing corresponds to about 1.6nm per channel in the 1260nm to 1360nm wavelength range.

O-BAND DWDM ITU Grid 200GHz Channels
# GHz nm # GHz nm
1 238800 1255.37 31 232800 1306.97
2 238600 1257.03 32 232600 1308.76
3 238400 1258.70 33 232400 1310.55
4 238200 1260.36 34 232200 1312.34
5 238000 1262.04 35 232000 1314.15
6 237800 1263.71 36 231800 1315.95
7 237600 1265.40 37 231600 1317.76
8 237400 1267.09 38 231400 1319.57
9 237200 1268.78 39 231200 1321.39
10 237000 1270.47 40 231000 1323.21
11 236800 1272.17 41 230800 1325.03
12 236600 1273.87 42 230600 1326.86
13 236400 1275.57 43 230400 1328.69
14 236200 1277.28 44 230200 1330.52
15 236000 1279.00 45 230000 1332.36
16 235800 1280.71 46 229800 1334.20
17 235600 1282.43 47 229600 1336.04
18 235400 1284.15 48 229400 1337.89
19 235200 1285.88 49 229200 1339.74
20 235000 1287.61 50 229000 1341.59
21 234800 1289.35 51 228800 1343.45
22 234600 1291.09 52 228600 1345.31
23 234400 1292.84 53 228400 1347.17
24 234200 1294.59 54 228200 1349.03
25 234000 1296.34 55 228000 1350.90
26 233800 1298.10 56 227800 1352.77
27 233600 1299.87 57 227600 1354.64
28 233400 1301.64 58 227400 1356.52
29 233200 1303.41 59 227200 1358.40
30 233000 1305.19

O-band eliminates the need for, and the additional cost of, dispersion management such as digital signal processing (DSP) units. For that reason, O-band is ideally used in high-speed, cost-sensitive, high-volume markets.

Be sure to read more on O-band, its characteristics and catch up on our O-band portfolio in our DWDM O-band 100G solution article.