Cross-polarization effects in sheared 2D grating couplers in a photonic BiCMOS technology. (12th May 2020)

• Record Type: Journal Article
• Authors: Georgieva, Galina; Voigt, Karsten; Mai, Christian; Seiler, Pascal M.; Petermann, Klaus; Zimmermann, Lars
• Is Part Of: Japanese journal of applied physics. Volume 59:Number SO(2020)
• Publication Date: 2020-05-12
• Subjects: 2D grating couplers -- silicon photonics -- photonic bicmos -- cross-polarization -- split ratio -- coherent receivers -- advanced modulation formats; Physics -- Periodicals; 621.05
• DOI: 10.35848/1347-4065/ab8e21
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: We investigate numerically and experimentally sheared 2D grating couplers in a photonic BiCMOS technology with a focus on their splitting behavior. Two realization forms of a waveguide-to-grating shear angle are considered. The cross-polarization used as a figure-of-merit is shown to be strongly dependent on the grating perturbation strength and is a crucial limitation not only for the grating splitting performance, but also for its coupling efficiency.