WDM is a method for multiplexing multiple data on single-core optical fiber cable by changing the wavelength of the carrier wave. There are two modes depending on the multiplexed density: DWDM (dense wavelength division multiplexing) and CWDM (coarse wavelength division multiplexing). DWDM typically uses eight or more wavelengths in the 1.55 um band (some use the 1.3 or 1.6 μm band) that are densely arranged at wavelength intervals from 0.4 to 3.2 nm. In contrast, CWDM uses two to eight wavelengths spaced at wavelength intervals ranging from 20 to several hundred nanometers.
Window materials commonly used in our devices are described below. The window material must carefully be selected according to the application because the window material determines the spectral response short wavelength cutoff.
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