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A novel adjustable coupled two-cavity allpass filter has been realised for the dispersion slope compensation of optical fibres. The filter gives variable compensation between –2.0 and –15.5 ps3 over a bandwidth between 3.6 and 1.2 nm, respectively. The filter performance agrees quite well with that predicted by existing theory.
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Jablonski et al. (2000) studied this question.
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