CWDM (Coarse Wavelength Division Multiplexing) and DWDM (Dense Wavelength Division Multiplexing) enable carriers to deliver more services over their existing fiber infrastructure by combining multiple wavelengths on a single fiber. FS offers a line of CWDM/DWDM solutions and products that help alleviate your fiber exhaust in a reliable, cost-efficient way.
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 grid is shown below. 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.
|ITU Channel No.||Wavelength (nm)|
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.
In addition to the various CWDM/DWDM transceivers, FS also provides a wide range of CWDM/DWDM Mux/Demux modules, which acts as the major building block in network expansion and upgrade. FS CWDM/DWDM Mux/Demux comes in several different types in regard to line type, channel number, and special ports.
|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|
ITU G.694.1 standard DWDM region is from 1528.77nm to 1563.86nm that resides mostly within the C band. DWDM can have 100GHz (0.8 nm) wavelength spacing for 40 channels, or 50GHz (0.4 nm) spacing for 80 channels. The complete channel grid for 100GHz DWDM is shown below.
|Channel||Frequency (THz)||Center Wavelength (nm)||Channel||Frequency (THz)||Center Wavelength (nm)|
FS CWDM transceivers are available with all 44 DWDM wavelengths, including DWDM SFP, DWDM SFP+, DWDM XFP and Tunable DWDM transceivers that support transmission distance up to 100km. Tunable DWDM transceivers is able to support a specific channel in a DWDM optical network, allowing for remotely change wavelengths in software.
DWDM is used in long haul networks to help alleviate fiber exhaustion and the costs involved in running new fiber. Each DWDM channel can transport up to 100G, and distances over 1000 kilometers can be achieved with the use of optical amplifiers.