DWDM packs wavelengths tightly — tens of channels on a single fiber pair — using temperature-stabilised lasers and precision filters. It is how carriers and large operators move enormous aggregate capacity over long distances, and it is the upper half of GRT’s WDM manufacturing range, offered alongside complete transmission solution design.
The discipline DWDM demands is specification rigour: channel grids are standardised, optics must be ordered to exact channel numbers, and amplification and dispersion enter the design as distances grow. In return, the fiber plant stops being the constraint for a generation — growth becomes a matter of lighting more channels on the same pair. For enterprises, DWDM typically appears in data-centre interconnect and disaster-recovery links between sites that must behave like one.
Where DWDM is specified
- Data-centre interconnect over metro distances
- Carrier and operator backbone capacity
- Disaster-recovery links with many parallel channels
- Any design whose channel count outgrows CWDM plans
How is DWDM different from CWDM in practice?
Channel spacing and everything that follows: DWDM fits far more channels and reaches far longer distances, at higher per-channel optics cost and tighter engineering tolerances.
Do you design the whole link?
Yes. GRT provides complete transmission solutions around its WDM equipment — describe the sites, distance and channel requirement and the design follows.