Technology |
CWDM |
DWDM – regional networks |
DWDM – long-distance networks |
Number of channels (wavelengths) |
4-16 |
32-80 |
80-160 |
Bands |
O, E, S, C, L |
C, L |
C, L, S |
Channel spacing |
20 nm or more (2500 GHz or more) |
0.8 nm, 100 GHz |
0.4 nm or less – 0.2 nm or 0.1 nm, (50 GHz or less) |
Transmission capacity per channel |
1.5 Gbps |
10 Gbps |
10-40 Gbps |
Fibre capacity |
20-40 Gbps |
100-1000 Gbps |
Tens of Tbps |
Laser type |
Non-cooled DFB or FP |
Cooled DFB |
Cooled DFB |
Reach |
50-80 km |
100 km |
1000 km |
Price |
Low |
High |
Highest |