Abstract
A polarization-independent, multifunctional all-fiber comb filter by
using variable ratio coupler (VRC)-based dual-pass Mach–Zehnder interferometer
is newly proposed and demonstrated. Depending on the dynamic settings of coupling
ratios of the fiber couplers, the comb filter provides the channel spacing
tunable, multiwavelength switchable, and flat-top spectral responses. Theoretical
calculations are verified by the experimental results. Experimentally, a comb
filter with the channel spacing tunable from 0.4 to 0.8 nm was obtained. Meanwhile,
when the comb spacing was tuned to 0.8 nm, the multiwavelength switchable
operation with both the sinusoid and flat-top spectral responses was achieved.
The proposed comb filter may find applications in optical communication systems
and tunable multiwavelength fiber lasers.
© 2012 IEEE
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