MCWDM means Mini Coarse Wavelength Division Multiplexer Modules.
These are much smaller than standard CWDM modules.
Optosuns CWDM modules are Telcordia qualified to meet GR-1221-CORE
Features:
Low insertion loss
High channel isolation
High stability and reliability
Various connector options FC, SC, LC
Wavelength - 1271 to 1611
Various pigtail options:
250um bare fiber - 900um loose tube - 2mm loose tube - 3mm loose tube
4 + 1 UPG channel
Applications:
CWDM systems
Metro and Access Networks
CATV Fiber optic Systems
Please download the MCWDM 4 + 1 UPG channel PDF here for Full specifications : 
