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Enhanced Coupling Strength (ECS) outcoupler gratings theoretically provide an order of magnitude reduction of grating length compared with conventional outcoupler gratings in III-V photonic waveguides. The dependence of the magnitude and spectral width of the outcoupled power of ECS outcoupling gratings is analyzed using a Floquet-Bloch space-harmonic approach for two different ECS grating geometries. ECS outcoupler gratings allow near-surface normal emission of integrated optical devices such as laser transmitters consisting of short horizontal cavity lasers combined with high-speed modulators that can operate without temperature control over a wide temperature and wavelength ranges.
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Maryam Dezfuli, Freddie Castillo II, Weida Zhang, Scott McWilliams, Jerome K. Butler, Ralph Johnson, Nai-Hsiang Sun, Gary A. Evans, "Second-order enhanced coupling strength grating outcouplers in III-V photonic waveguides," Proc. SPIE PC12021, Novel In-Plane Semiconductor Lasers XXI, PC120210Q (7 March 2022); https://doi.org/10.1117/12.2608337