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Optical interleavers are 3-port passive fiber optic devices that are used to combine two sets of dense wavelength division mulitplexing (DWDM) channels into a composite signal. The interleaving process can be repeated, creating even denser composite signals with 25 GHz or 12.5 GHz spacing. These devices can be used in a reverse direction, forming an optical deinterleaver that separates a denser DWDM signal into odd channels and even channels.