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O-Band DWDM Mux/DeMux
Overview
The CWDM-band can be divided into a low channel band (1271nm to 1451nm) and a high channel band (1471nm to 1611nm). The wavelength grid is at 20nm separation as defined in the ITU-T standard G.694.2. CWDM channels can only be carried on single-mode fibers.
CWDM channels are carried on single-mode fibers where the lower CWDM channel band faces a higher intrinsic attenuation and many older fibers have also a high attenuation area (called “water-peak”). These two together will typically limit the bridgeable distance for low-band CWDM channels. The Vsunlight CWDM filters skip the two channels most affected by the water-peak. So the low CWDM-band is reduced to 8 channels. For longer distances or where the link attenuation is high, a CWDM solution could be limited to using the high CWDM channel band where the intrinsic fiber attenuation is lower. Here the dispersion could be the limiting factor instead.
Note! The CWDM channels are according to the ITU-T G.694.1 located at 1271nm, 1291nm etc at 20nm spacing. The CWDM channels are also (for historical reasons) called “1270nm”, “1290nm” etc.
The actual wavelengths are always according to ITU-T G.694.1 regardless of used label/name.
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