Frequency grid

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The most common frequency grid is that used for channel spacing in Dense Wavelength Division Multiplexing (DWDM) for Fiber-optic communication at wavelengths around 1550nm and defined by ITU-T G.694.1 (2002). The grid is defined relative to 193.1THz and extends from 191.7 THz to 196.1 THz with 100 GHz spacing. While defined in frequency the grid is often expressed in terms of wavelength in which case it covers the wavelength range of 1528.77 nm to 1563.86 nm with approximately a 0.8nm channel spacing.

For practical purposes the grid has been extended to cover 186 THz to 201 THz and sub divided to provide 50 GHz and 25 GHz spaced grids.

[edit] References

• ITU Grid Table for 100Ghz spacing

ITU-T G.694.1, “Spectral grids for WDM applications: DWDM frequency grid,” May 2002.

• International Standardization Activities on Optical Interfaces