Abstract
Optical allpass filters allow any phase response to be approximated, making them ideal for dispersion compensation in WDM systems. By concatenating several stages, filters with wide passband widths (BW) relative to the Free Spectral Range (FSR), large dispersions, and extremely low group delay ripple can be designed. Experimental results for a two-stage (FSR=12.5 GHz, D=±4200 ps/nm, BW=4.5 GHz) and four-stage (FSR=25 GHz, BW=13.5 GHz, D=±1589 ps/nm) filter using ring resonators in planar waveguides are presented. Architectures for tunable dispersion compensation and dispersion slope compensation are also discussed. Allpass filters are compact and capable of compensating multiple channels due to their periodic response.
© 1999 Optical Society of America
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