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Proposal for diminishment of the polarization-dependency in a Si-nanowire multimode interference (MMI) coupler by tapering the MMI section
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0002-3401-1125
2008 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 20, no 5-8, 599-601 p.Article in journal (Refereed) Published
Abstract [en]

This letter presents a design for diminishing the polarization-dependency of a Si nanowire-based multimode interference (MMI) coupler by using a tapered MMI section. The entrance width and waist width of the tapered MMI section are optimized to obtain a polarization-insensitive MMI length for N-fold self-imaging. The MMI section with a diminished polarization-dependency has a relatively large entrance width, which is beneficial to the separation of adjacent access waveguides for minimizing the coupling between them. One can tune the power splitting ratio of a 2 x 2 Si-nanowire MMI coupler by adjusting the entrance and the waist width of the tapered MMI section.

Place, publisher, year, edition, pages
2008. Vol. 20, no 5-8, 599-601 p.
Keyword [en]
multimode interference (MMI), nanowire, polarization, Si, taper, wave-guides, fabrication, devices, design
Identifiers
URN: urn:nbn:se:kth:diva-17726DOI: 10.1109/lpt.2008.918902ISI: 000257952800090Scopus ID: 2-s2.0-41849085231OAI: oai:DiVA.org:kth-17726DiVA: diva2:335771
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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