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High-resolution photonics-based interference suppression filter with wide passband

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2 Author(s)
Chan, E.H.W. ; Sch. of Electr. & Inf. Eng. & Australian Photonics CRC, Univ. of Sydney, Australia ; Minasian, R.A.

A new topology for a photonic signal processor, which overcomes the basic recursive frequency response problem that limits the passband range, is presented. The structure is based on a new multiple-wavelength offset-cavity structure that is cascaded with a series of unbalanced delay line structures. This not only can synthesize a very narrow notch response with good shape factor but also permits a multifold extension of the free spectral range (FSR) and passband width. Results on the interference mitigation filter demonstrate a stopband of 1% of center frequency and a fourfold increase in the FSR and passband width, while also having a very small shape factor, in excellent agreement with predictions.

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Lightwave Technology, Journal of  (Volume:21 ,  Issue: 12 )