Tunable Optical Transceivers: What are they and when should they be used?

Tuneable optical transceivers for DWDM (Dense Wavelength Division Multiplexer) systems, such as XFP and SFP+, have been widely available within the telecommunications industry for a number of years.
Common Optical Transceiver Formats

As technology has progressed over time, transceivers too have improved drastically. They are now very popular within telecommunication networks across the world because of their