Coarse Wave Division Multiplexing (CWDM) systems offer a variety of different channels which feature wavelengths that are spaced 20 nanometers apart. This system allows for the use of low-cost, uncooled lasers for CWDM. CWDM technology offers a cost-effective solution for transmissions up to 70 kilometers.
In a common CWDM system, laser emission occurs on full eighteen channels at eighteen different wavelengths. The wavelengths used are 1610 nm, 1590 nm, 1570 nm, 1550 nm, 1530 nm, 1510 nm, 1490 nm, 1470 nm, 1450 nm, 1430 nm, 1410 nm, 1390 nm, 1370 nm, 1350 nm, 1330 nm, 1310 nm, 1290 nm and 1270 nm. An industry standard color-coding scheme was developed to easily identify the wavelength of each CWDM transceiver. The latches of the CWDM transceivers match the colored port indicators on the passive units thereby allowing a simple setup and easy identification. See our