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Novel Multitap, Flat-Top Microwave Photonic Filter Based on Sinusoidal Group Delay Gratings

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2 Author(s)
Xiaoke Yi ; Sch. of Electr. & Inf. Eng., Sydney Univ., Sydney, NSW ; Minasian, R.A.

A new microwave photonic filter structure that realizes both a multitap, flat-top radio-frequency bandpass filter and bipolar taps, while also exhibiting low-noise operation, is presented. It is based on using a phase-modulated laser signal propagating through a novel sinusoidal group delay grating, which induces tailored phase shifts to the carrier and sidebands. The filter integrates tap weighting and delays simultaneously in one unit, which enables multiple-tap low-noise signal processing together with negative coefficients. Experimental results demonstrate the realization of a flat-top bandpass filter response with 7.8-GHz free spectral range and more than 45-dB rejection ratio. Extensions to this concept by connecting additional sinusoidal group delay gratings in cascade, to provide enhanced signal processing functions, are also described.

Published in:

Lightwave Technology, Journal of  (Volume:26 ,  Issue: 15 )

Date of Publication:

Aug.1, 2008

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