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Adaptive gain and channel equalization filters for applications in optical networks

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5 Author(s)
Offrein, B.J. ; IBM Res. Div., Ruschlikon, Switzerland ; Bona, G.L. ; Germann, R. ; Horst, F.
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We present two dynamically reconfigurable filter components, an adaptive gain flattening filter and a variable channel equalizer. The channel equalizer is able to set the optical power of up to eight WDM channels individually over a dynamic range of at least 10 dB, the gain equalizer flattens the response of optical amplifiers across a spectral range of more than 40 nm in the 1550 nm window. Reconfigurability is obtained via thermo-optic tuning of the cascaded resonant coupler (RC) segments. The devices are realized in high-index contrast SiON technology. The experimental accuracy of the attenuation across the full band is around 1 dB, which can be further improved by using more delay line stages

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LEOS '99. IEEE Lasers and Electro-Optics Society 1999 12th Annual Meeting  (Volume:2 )

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