Please let me know the advantages and disadvantages of using these methods for tuning filter response:

1-electrooptic kerr effect (DC Kerr) : changing refractive index by applied electric field

2-optic kerr effect(AC Kerr or nonlinear effect): changing index by light intensity

3- loop mirror(sagnac effect): changing coupling coefficient of coupler by applied electric field 

Also, if anyone know a better way for tuning the ring based filter response , please Proposed to be discussed.

thanks so much...

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