Experimental demonstration of chiral spiral waveguides without waveguide crossings

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Spiral waveguides are important building blocks both for telecom and sensing applications [1], [2]. We have recently demonstrated that VTT micron-scale silicon photonics platform has several advantages, compared to other platforms, when looking for a trade-off between compactness and propagation loss [3]. Our previous work has been focused on non-chiral spirals, where the light enters the spiral, let’s say, clockwise and exits counter-clockwise. On the other hand, some sensing applications like gyroscopes require non-zero chirality [4], which implies as many waveguide crossings as the spiral rounds. Light passes in each crossing twice, first in one direction and afterwards in the orthogonal one. Here we propose and demonstrate experimentally a novel configuration that doesn’t require any waveguide crossing. It is based on MMI splitters designed to couple light completely in the cross port. The concept is sketched in Fig. 1(a). Nested loops are coupled to each other through the MMI splitters, which effectively work as waveguide crossings with collinear waveguides, at variance with the orthogonal waveguides of usual crossings. We have designed and fabricated three chiral spirals on our platform, based on 3 µm thick silicon strip waveguides. They have 7, 13 and 49 loops respectively, corresponding to the effective lengths 6.6 cm, 12.5 cm and 47.9 cm, which include the 1.58 mm MMI length counted twice (see Fig. 1(a)).
Original languageEnglish
Title of host publication2015 European Conference on Lasers and Electro-Optics
Subtitle of host publicationEuropean Quantum Electronics Conference
PublisherOptical Society of America OSA
ISBN (Print)978-1-4673-7475-0
Publication statusPublished - 2015
MoE publication typeA4 Article in a conference publication
EventEuropean Conference on Lasers and Electro-Optics, CLEO 2015 - Munich, Germany
Duration: 21 Jun 201525 Jun 2015

Conference

ConferenceEuropean Conference on Lasers and Electro-Optics, CLEO 2015
CountryGermany
CityMunich
Period21/06/1525/06/15

Fingerprint

Waveguides
Demonstrations
Silicon
Chirality
Gyroscopes
Photonics

Cite this

Aalto, T., Cherchi, M., Ylinen, S., Kapulainen, M., Harjanne, M., & Vehmas, T. (2015). Experimental demonstration of chiral spiral waveguides without waveguide crossings. In 2015 European Conference on Lasers and Electro-Optics: European Quantum Electronics Conference [CH_6_1] Optical Society of America OSA.
Aalto, Timo ; Cherchi, Matteo ; Ylinen, Sami ; Kapulainen, Markku ; Harjanne, Mikko ; Vehmas, Tapani. / Experimental demonstration of chiral spiral waveguides without waveguide crossings. 2015 European Conference on Lasers and Electro-Optics: European Quantum Electronics Conference. Optical Society of America OSA, 2015.
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Aalto, T, Cherchi, M, Ylinen, S, Kapulainen, M, Harjanne, M & Vehmas, T 2015, Experimental demonstration of chiral spiral waveguides without waveguide crossings. in 2015 European Conference on Lasers and Electro-Optics: European Quantum Electronics Conference., CH_6_1, Optical Society of America OSA, European Conference on Lasers and Electro-Optics, CLEO 2015, Munich, Germany, 21/06/15.

Experimental demonstration of chiral spiral waveguides without waveguide crossings. / Aalto, Timo; Cherchi, Matteo; Ylinen, Sami; Kapulainen, Markku; Harjanne, Mikko; Vehmas, Tapani.

2015 European Conference on Lasers and Electro-Optics: European Quantum Electronics Conference. Optical Society of America OSA, 2015. CH_6_1.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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T1 - Experimental demonstration of chiral spiral waveguides without waveguide crossings

AU - Aalto, Timo

AU - Cherchi, Matteo

AU - Ylinen, Sami

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AU - Harjanne, Mikko

AU - Vehmas, Tapani

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AB - Spiral waveguides are important building blocks both for telecom and sensing applications [1], [2]. We have recently demonstrated that VTT micron-scale silicon photonics platform has several advantages, compared to other platforms, when looking for a trade-off between compactness and propagation loss [3]. Our previous work has been focused on non-chiral spirals, where the light enters the spiral, let’s say, clockwise and exits counter-clockwise. On the other hand, some sensing applications like gyroscopes require non-zero chirality [4], which implies as many waveguide crossings as the spiral rounds. Light passes in each crossing twice, first in one direction and afterwards in the orthogonal one. Here we propose and demonstrate experimentally a novel configuration that doesn’t require any waveguide crossing. It is based on MMI splitters designed to couple light completely in the cross port. The concept is sketched in Fig. 1(a). Nested loops are coupled to each other through the MMI splitters, which effectively work as waveguide crossings with collinear waveguides, at variance with the orthogonal waveguides of usual crossings. We have designed and fabricated three chiral spirals on our platform, based on 3 µm thick silicon strip waveguides. They have 7, 13 and 49 loops respectively, corresponding to the effective lengths 6.6 cm, 12.5 cm and 47.9 cm, which include the 1.58 mm MMI length counted twice (see Fig. 1(a)).

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SN - 978-1-4673-7475-0

BT - 2015 European Conference on Lasers and Electro-Optics

PB - Optical Society of America OSA

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Aalto T, Cherchi M, Ylinen S, Kapulainen M, Harjanne M, Vehmas T. Experimental demonstration of chiral spiral waveguides without waveguide crossings. In 2015 European Conference on Lasers and Electro-Optics: European Quantum Electronics Conference. Optical Society of America OSA. 2015. CH_6_1