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Subwavelength adiabatic multimode Y-junctions
Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China..
Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China..
KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.ORCID iD: 0000-0002-3368-9786
Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China.;Wuhan Natl Lab Optoelect, Wuhan 430074, Hubei, Peoples R China..ORCID iD: 0000-0002-3742-1445
2019 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 44, no 19, p. 4729-4732Article in journal (Refereed) Published
Abstract [en]

Adiabatic multimode Y-junctions are extensively used for the design of multimode silicon photonics devices due to their straightforward principle in achieving mode splitting and manipulation. However, experimentally, the limited feature size achievable by lithography can greatly deteriorate the adiabatic branching property and result in large excess loss and crosstalk. Here, we propose a branch structure consisting of a circular-hole-based chirped subwavelength slot. By optimizing the holes' radii and positions under our fabrication constraint, we designed and experimentally demonstrated both symmetric and asymmetric approximately adiabatic four-mode Y-junctions with excellent performance close to ideal Y-junctions over a broad wavelength span. Such junctions are compact, CMOS-compatible, exhibit a relatively large fabrication tolerance, and could be extended for more modes; hence they can be potentially deployed for mode-division multiplexing silicon-photonic systems.

Place, publisher, year, edition, pages
OPTICAL SOC AMER , 2019. Vol. 44, no 19, p. 4729-4732
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-262962DOI: 10.1364/OL.44.004729ISI: 000488503500027PubMedID: 31568428Scopus ID: 2-s2.0-85072760891OAI: oai:DiVA.org:kth-262962DiVA, id: diva2:1375712
Note

QC 20191205

Available from: 2019-12-05 Created: 2019-12-05 Last updated: 2020-02-04Bibliographically approved

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Yan, Max

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