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Grateful acknowledgement is made to the following source for permission to reproduce material within this unit:
Table 5: 'Nominal central wavelengths for CWDM’, ITU-T G.694.2 Prepublished Recommendation: Spectral Grids for WDM Applications: CWDM wavelength grid, International Telecommunication Union;
Table 6: 'Nominal central frequencies of the DWDM grid’, ITU-T G.691.1 Prepublished Recommendation: Spectral Grids for WDM Applications: DWDM frequency grid, International Telecommunication Union.
All other written material contained within this unit originated at the Open University
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