Wavelength Division Multiplexing (WDM) is a two or more different wavelengths of optical carrier signal (carry various types of information) at the transmitting side via the multiplexer merge together, and coupled to the same fiber optical lines for transmission of technology. CWDM: wavelength spacing of 20nm, the wavelength spacing is relatively wide. DWDM: wavelength spacing between 0.2 ~ 1.2nm. The product is a 1U rack design, can be installed in a standard 19-inch rack supports are between the CWDM 1270nm ~ 1610nm 20nm wavelength multiplexing, and with upgrades. Features Application: mainly used in coarse wavelength multiplexing transmission system reconciliation Bodo wave. Using foil design, can be rack or cassette package. Insertion loss is small, flexible design, easy to install and use. Widely used in metropolitan transport, traffic smaller IDC room. Coarse wave transmission relay rough wave rough wave MAN Specifications: Parameter (CWDM) 4-channel 8-channel 16-channel center wavelength (nm) 1270 ~ 1610 or 1271 ~ 1611 center wavelength accuracy (nm) ± 0.5 channel spacing (nm) 20 passband width (nm) ± 6.5 Insertion Loss (dB) ≤1.6 ≤2.5 ≤4.5 consistency (dB) ≤0.6 ≤1.0 ≤1.5 channel flatness (dB) ≤0.3 Isolation (dB) relative to the adjacent non ≥30 o ≥45 thermal stability insertion loss (dB / ℃) <0.005 <> Wavelength Thermal stability (nm / ℃) <0.002 <> polarization dependent loss (dB) <0.1 <> polarization-mode dispersion (ps) <0.1 <> directionality (dB) ≥50 return loss (dB) ≥45 maximum optical power through (mW) 300 Operating Temperature (℃) -20 ~ + 75 Storage Temperature (℃) -40 ~ + 85 package dimensions (mm) 440 ( W) × 44