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An adaptive gain equalization filter is presented. The filter is based on the resonant coupler principle, a cascade of power couplers and delay lines. Reconfigurability and tuning is achieved by varying coupling strength and delay line length via the thermo-optic effect. A device consisting of seven delay line stages was realized in high-index-contrast silicon-oxynitride technology. This device flattens the ASE spectrum of an EDFA to a ripple of less than 0.5 dB over 35 nm. The on-chip losses are 2 dB.
By: B.J. Offrein, F. Horst, G.L. Bona, R. Germann, H.W.M. Salemink and R. Beyeler
Published in: IEEE Photonics Technology Letters, volume 12, (no 5), pages 504-506 in 2000
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