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Simulation of Fourth-Order Laterally-Coupled Gratings

R. Millett, A. Benhsaien, K. Hinzer, T. Hall, and H. Schriemer
Centre for Research in Photonics, University of Ottawa, Ottawa, ON, Canada

Distributed feedback lasers improve the performance of standard Fabry-Perot laser designs by including a wavelength-selective grating that provides superior output, spectral purity and temperature stability. Laterally-coupled distributed feedback (LC-DFB) lasers with the use of higher order gratings have a grating that has been patterned out of the waveguide ridge which allows for simplified fabrication and monolithic integration with a variety of other photonic devices.

We have developed a technique using COMSOL Multiphysics to calculate the effective coupling coefficient of higher order laterally-coupled gratings. Our application uses a fourth-order grating that will produce a high-performance grating for DFB laser applications.