Galarza Galarza, MarkoThourhout, Dries VanBaets, RoelLópez-Amo Sáinz, Manuel2018-10-232018-10-2320081094-4087 (Electronic)10.1364/OE.16.008350https://academica-e.unavarra.es/handle/2454/31096Compact low-loss polarization independent vertical coupling between a 1.55 μm InGaAsP bulk active waveguide and a passive waveguide based on bimodal interference is presented. Simulation results show low coupling loss (<0.1 dB) over coupler lengths more than 5 times shorter than using the adiabatic design. The concept avoids submicron photolithographic features and shows acceptable fabrication tolerances.9 p.application/pdfeng© 2008 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.Compact mode couplingWaveguidesBimodal interferenceinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess