What is the difference of CWDM SFP and DWDM SFP Transceivers optical module ?

CWDM SFP+ optical module using CWDM technology, can pass an external wavelength division multiplexer, composite together the different wavelengths of light signal and transmitted through a single fiber, thus saving fiber resources. At the same time, the receiver need to use the wavelet decomposition of complex optical signal multiplexer decomposition.

Similar to DWDM SFP principle and CWDM SFP, but DWDM SFP is dense wavelength division!
DWDM SFP+ is called DWDM SFP+ (Dense where Division Multiplexing) technology, refers to a kind of optical fiber data transmission technology, this technology USES laser Wavelength according to bit parallel transmission line or string transmission mode in optical fiber transmission data. DWDM SFP optical module is for DWDM SFP optical module, it has 40 common channels to choose from