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A polarization-independent all-fiber comb filter with quasi-flat-top spectral response based on a dual-pass Mach–Zehnder (M-Z) interferometer is proposed and demonstrated. The proposed filter consists of a dual-pass M-Z interferometer with a section of high birefringence fiber (HBF) and a polarization controller (PC) in the second loop. The theoretical analysis shows that the apparatus allows to operate...
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