Coarse Wavelength Division Multiplexing (CWDM) was expanded to be used in which band where older fibers experienced significant absorption loss?

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Coarse Wavelength Division Multiplexing (CWDM) was indeed expanded to be utilized in the E-Band, which operates within the range of approximately 60 GHz to 90 GHz. This particular frequency range is generally favored for its ability to mitigate significant absorption losses that older fiber optics experience, especially in the lower bands like the C-Band (around 1530 to 1565 nm), where absorption can be notably high due to water peak effects.

E-Band technology takes advantage of the properties of higher frequencies, which typically offer increased capacity and reduced loss characteristics compared to the more traditional wavelengths used in telecommunications. The ability to use the E-Band is crucial for enhancing bandwidth capacity without requiring major infrastructural changes, thus making it a viable option for current and future fiber optic networks.

The other bands, while important in their own right, do not specifically target the absorption loss issues in older fiber infrastructure in the same way as the E-Band does. Each band has its own characteristics and optimal uses within communication technologies, but in the context of CWDM’s expansion and addressing absorption loss, the E-Band stands out as the most relevant choice.

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