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Phase-shifted Bragg-grating filters with improved transmission characteristics

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2 Author(s)
R. Zengerle ; Deutsche Telekom, Forschungs und Technologiezentru, Darmstadt, Germany ; O. Leminger

Standard Bragg filters (dielectric waveguides with a grating overlay) show a stopband only in reflection. Filters with quarter-wave-shifted gratings have an extremely narrow transmission peak the center of the stopband but its shape (a sharp triangle with a broad bottom) is not suitable for system design. Using standard coupled-mode theory together with transfer-matrix formalism, we show that by introducing several phase-shift regions and properly choosing their locations and magnitudes the transmission spectrum can be tailored into a nearly rectangular shape. For InP-InGaAsP based Bragg-grating filters estimates are made of achievable channel spacings in wavelength-division multiplexing systems

Published in:

Journal of Lightwave Technology  (Volume:13 ,  Issue: 12 )