Phase Reconstruction fortheFrequency Response Measurement ofFBGs

A signal processing algorithm isapplied toopticalbetween optical andrfspectral characteristics (3), using spectral analyzer measurements inorder toreconstruct phase single-sideband modulation ofan optical carrier (SSB response ofFBGsfromeasy-to-obtain module data, soavoidingmethod) hasbeenproposed. Thistechnique alsooffers a theuseofcostly andcomplex equipment fordirect measurementdirect measurement ofthephaseresponse, butitisnot offrequency response. Inorder toprove validity, reconstructed commercially available andthesideband suppression needed phase, bothintransmission andreflection, isthencompared to ommerciall avilblantessu ppression ned measuresfromthreedifferent techniques (interferometric, toobtains modulation phase-shift, andsingle-sideband modulation). easytoobtain. Insomeparticular cases, aphase-retrieval method canbe