Abstract
A tunable eye-opening lattice filter for dispersion compensation is demonstrated on an ultra low-loss waveguide platform based on a compact high-aspect ratio Si3N4 core. A programmable 10th order lattice filter is demonstrated by cascading a total of 21 Mach-Zehnder interferometers with programmable delay lines of lengths designed at the baseband data rate. The filter has a footprint of 2.23 cm2 with continuously tunable dispersion from -500 ps/nm to 500 ps/nm. The filter shows a periodic transfer function with a measured FSR of 100 GHz capable of compensating multiple WDM channels with a single device.
Highlights
Chromatic dispersion is an undesired fiber characteristic resulting directly from the fact that group delay changes with wavelength
A tunable eye-opening lattice filter for dispersion compensation is demonstrated on an ultra low-loss waveguide platform based on a compact high-aspect ratio Si3N4 core
A programmable 10th order lattice filter is demonstrated by cascading a total of 21 MachZehnder interferometers with programmable delay lines of lengths designed at the baseband data rate
Summary
Chromatic dispersion is an undesired fiber characteristic resulting directly from the fact that group delay changes with wavelength. Optical filters will have a periodic frequency response that allows for simultaneous compensation of multiple WDM channels using a single device. The tunability of such devices provides a great way to dynamically compensate for residual chromatic dispersion which can fluctuate due to temperature changes, path changes in reconfigurable optical networks, as well as end of life device and system characteristics. The platform is capable of providing state-of-the-art waveguide losses at bend radius 10x smaller than silica waveguides This platform allows for the integration of a lattice filter with large stage number at a small footprint. We demonstrate a 10-stage optical lattice filter with periodic frequency response capable of compensating +/− 500 ps/nm of dispersion for multiple WDM channels simultaneously. The device is integrated on a high-aspect ratio Si3N4 waveguide core, where the core geometry determines the overall loss and bending capabilities [7]
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