Lantronix
CWDM-xxxxxCR-B Mux/Demux User Guide
33794 Rev. B
https://www.lantronix.com/
Page 14 of 19
Theory of Operation
Coarse Wave Division Multiplexing
CWDM can be briefly described as a method of transmitting multiple signals over a fiber optic link using separate,
distinct wavelengths, based on the entire wavelength spectrum (1270nm – 1610nm in 20nm increments) defined by the
standard. In general, CWDM components multiplex the optical signal outputs from ‘4’ or more
electronic devices. These signals are sent over a single optical fiber. The signals are then demultiplexed into separate,
distinct signals for input into electronic devices at the other end of the fiber optic link. See Figure 11.
Figure 11: Coarse Wave Division Multiplexing
Lantronix CWDM devices utilize thin-film filter technology. Since the CWDM devices are entirely passive, they can be
used in conjunction with lower-cost, noncooled laser sources. These CWDM devices are available in two main
configurations: Multiplexer/Demultiplexer (Mux/Demux) modules, and Optical Add/Drop Multiplexer (OADM) modules.
