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CWDM is short for Coarse wavelength division multiplexing. It is a technology of combining multiple signals on laser beams at various wavelengths for transmission along fiber optic cables. Transmission is realized using 18 channels with wavelengths between 1270 nm and 1610 nm. Due to the channel spacing of 20 nm cost-effective lasers can be used. The channel width itself is 13 nm. The remaining 7 nm is designed to secure the space to the next channel.
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PARAMETER |
UNIT |
VALUES |
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Channels |
1×2 | 1×4 | 1×8 | 1×16 | 1×18 |
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Wavelength Range |
nm | 1260 ~ 1620 |
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Channel Center Wavelength |
nm | 1270 / 1290 / … / 1610 or 1271 / 1291 / … /1611 |
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Channel Spacing |
nm | 20 |
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Channel Passband |
nm | λc ± 7.5 |
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Insertion Loss |
dB | ≤0.8 | ≤1.5 | ≤2.5 | ≤5.2 |
≤6.4 |
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Adjacent Channel Isolation |
dB |
≥ 30 | ||||
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Non-adjacent Channel Isolation |
dB | ≥ 40 |
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Wavelength thermal stability |
nm/℃ | ≤ 0.003 |
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Insertion loss thermal stability |
dB/℃ |
≤ 0.005 | ≤ 0.005 | ≤ 0.005 | ≤ 0.007 | ≤ 0.008 |
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PDL |
dB |
≤ 0.1 |
≤0.15 | ≤ 0.15 | ≤ 0.20 | ≤ 0.25 |
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Polarization mode dispersion |
ps |
≤ 0.1 |
≤ 0.1 | ≤ 0.1 | ≤ 0.15 | ≤ 0.15 |
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Directivity |
dB | ≥ 50 |
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Return loss |
dB |
≥ 45 | ||||
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Optical Power |
mW | ≤ 500 |
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Operating Temperature |
℃ | -10 ~ +70 |
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Storage Temperature |
℃ | -40 ~ +85 |
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Relative Humidity |
% |
5 ~ 95 |
