According to different transition in the atomic structure, FADOFs can be classified into twotypes: passive and active.Based on the transition from 5S1/2 to 6P1/2 of rubidium,an Faraday anomalous dispersion optical filter (FADOF) working at 421.55nm can be realized. The optimal working temperature,magnetic induction and cell length are suggested. FADOF working on this wavelengthcan be used for atmospheric and underwater optical communications.
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