Abstract

We have fabricated superstructure rocking filters which operate on the principle of linear polarization rotation through the twisting of the birefringent axes of photosensitive elliptical-core fibers by UV radiation. The polarization coupling spectrum of these filters consists of a series of narrow resonances which are roughly equally spaced in frequency. This can result in a comb-like response extending over the entire single-mode frequency range of the fiber. Applications of such structures are also discussed.

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