CWDM GBIC transceivers are widely used by companies which lease optical fibers, alternatively they also can be used to upgrade existing networks (by multiplying capacity of already installed optical cables without need for adding new ones). Thanks to optical multiplexing technology it is possible to send many separate data streams (channels) over same strain of fiber. Optical  CWDM multiplexers and demultiplexers are needed at the ends of each fiber to extract/add particular channels and guide them to/from the appropriate connectors. Usage of such CWDM tranceivers can bring huge savings on the long-term basis. CWDM technology offers up to 18 channels. Almost all of offered modules are available in various versions:

FTG-S12G-CXXQ-YYB

YY - denotes guaranteed power budget: (28 - 28dB, 32 - 32dB)

XX -  in CWDM modules denotes wavelengths available to choose from [nm]: (27~61 - 1270~1610nm)

For details please check datasheets or contact support department.