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Luca Daniel. Samolis, Christos D Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science 2016-12-22T16:29:15Z 2016-12-22T16:29:15Z 2015 2016 http://hdl.handle.net/1721.1/106106 965551598 Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, February 2016. "May 2015." Cataloged from PDF version of thesis. Includes bibliographical references (pages 67-70). Three dimensional Finite Difference Time Domain (3D-FDTD) simulation serves as the indisputable gold standard for device design and verification in silicon photonics. However, 3D-FDTD is prohibitively expensive for large devices let alone cascaded systems, leading to the pursuit of a diversified simulation toolkit to acquire the full device response or combined device (cascade or parallel) response. A modular approach is followed subsequently. For analyzing silicon photonics at the systems level, transfer matrices in the modal/frequency domain are ubiquitously used. These matrices encapsulate the frequency response as well as the coupling coefficients between the various optical eigenmodes across all device ports. In this thesis we formulate and explore the performance of a fast, memory efficient stand-alone FDTD based algorithm that uses transfer matrices within the simulation window for the optical characterization of adiabatic mode-evolution devices. This class of adiabatic devices is vital to silicon photonics systems thanks to their broadband nature and reliable performance under fabrication induced perturbations and parameter variation. In our approach, the simulation domain is divided into blocks which can be simulated independently in the time domain, and then combined using modal transfer matrices. It is critical that we can match the accuracy of a 3D-FDTD simulation for a base class of devices and make an argument that time domain and modal techniques can be perfectly reconciled in a simulation environment where these devices appear and play a significant role. This environment might be targeting a particular device or even an entire section of the chip. When compared to pure 3D-FDTD this approach proves auspicious from a computational standpoint as it yields, in the limit of large devices, an asymptotic linear speedup when the blocks are simulated sequentially, and can further yield a quadratic speedup when an extra level of parallelization is employed. by Christos D. Samolis. M.Eng. 70 pages eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Electrical Engineering and Computer Science. Reconciling modal and time domain techniques in photonic simulation Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="dfb73ece-2791-4702-ba47-8c92ace51e00"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Reconciling modal and time domain techniques in photonic simulation</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2016</PublicationDate> <Authors> <Author> <DisplayName>Samolis, Christos D</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Electrical Engineering and Computer Science.</Keyword> <Abstract>Three dimensional Finite Difference Time Domain (3D-FDTD) simulation serves as the indisputable gold standard for device design and verification in silicon photonics. However, 3D-FDTD is prohibitively expensive for large devices let alone cascaded systems, leading to the pursuit of a diversified simulation toolkit to acquire the full device response or combined device (cascade or parallel) response. A modular approach is followed subsequently. For analyzing silicon photonics at the systems level, transfer matrices in the modal/frequency domain are ubiquitously used. These matrices encapsulate the frequency response as well as the coupling coefficients between the various optical eigenmodes across all device ports. In this thesis we formulate and explore the performance of a fast, memory efficient stand-alone FDTD based algorithm that uses transfer matrices within the simulation window for the optical characterization of adiabatic mode-evolution devices. This class of adiabatic devices is vital to silicon photonics systems thanks to their broadband nature and reliable performance under fabrication induced perturbations and parameter variation. In our approach, the simulation domain is divided into blocks which can be simulated independently in the time domain, and then combined using modal transfer matrices. It is critical that we can match the accuracy of a 3D-FDTD simulation for a base class of devices and make an argument that time domain and modal techniques can be perfectly reconciled in a simulation environment where these devices appear and play a significant role. This environment might be targeting a particular device or even an entire section of the chip. When compared to pure 3D-FDTD this approach proves auspicious from a computational standpoint as it yields, in the limit of large devices, an asymptotic linear speedup when the blocks are simulated sequentially, and can further yield a quadratic speedup when an extra level of parallelization is employed.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>