Study investigates chip-based dispersion compensation for faster fiber internet

 https://techxplore.com/news/2023-06-chip-based-dispersion-compensation-faster-fiber.html

"high dispersion, high speed data, and small form factor... 2 grating devices, single grating pitch of 434 nm and another with 2 overlaid gratings dissimilar pitches 434 and 440 nm... stopband both spectra induces forward and backward propagating modes... dispersion compensation long fiber up to 20 km minimal loss, reducing bit error rates 9 orders magnitude... control OGD dynamically... less power, integrating SGD and OGD into commercial transceivers, either within transmitter or receiver chip"