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Compact tunable FIR dispersion compensator in SiON technology

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6 Author(s)
Horst, F. ; IBM Res., Zurich Res. Lab., Ruschlikon, Switzerland ; Germann, R. ; Bapst, U. ; Wiesmann, D.
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We present a tunable dispersion compensator, based on a sixth-order finite impulse response lattice filter. The filter has a free spectral range of 100 GHz and can be tuned for linear group delay slopes between -100 and 100 ps/nm with less than 1-ps ripple over a usable bandwidth of more than 60 GHz. Within this usable bandwidth, the average polarization-mode dispersion is low, reaching 2.4 ps only for extreme group delay slopes. The filter can also generate higher order group delay curves, for example for dispersion slope compensation.

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Photonics Technology Letters, IEEE  (Volume:15 ,  Issue: 11 )