Problem The isolator is plarization-dependent incoming light randomly polarised will lose 50% of its power If the signal is polarised and the orientation is wrong then we can lose all of the signal if the polarisation varies with time the variations will be translated into variations in attenuation serious noise!
Problem • The isolator is plarization-dependent • incoming light randomly polarised will lose 50% of its power! • If the signal is polarised and the orientation is wrong then we can lose all of the signal. • if the polarisation varies with time the variations will be translated into variations in attenuation:serious noise!
Polarisation Independent isolator separating the incoming ray into its two orthogonal polarisations processing them separately and then re-combining them at the output
Polarisation Independent Isolator • separating the incoming ray into its two orthogonal polarisations • processing them separately • and then re-combining them at the output