Timo Aalto

D.Sc. (Tech.)

  • Phone+358408485037
19992020

Research output per year

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Research Output

2020

Amorphous silicon waveguide escalator: Monolithic integration of active components on 3 μm SOI platform

Bera, A., Cherchi, M., Tappura, K., Heimala, P. & Aalto, T., 2020, Silicon Photonics XV. Reed, G. T. & Knights, A. P. (eds.). International Society for Optics and Photonics SPIE, 1128507. (Proceedings of SPIE, Vol. 11285).

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

Flat-top interleavers based on single MMIs

Cherchi, M., Sun, F., Kapulainen, M., Harjanne, M. & Aalto, T., 2020, Silicon Photonics XV. Reed, G. T. & Knights, A. P. (eds.). Bellingham: International Society for Optics and Photonics SPIE, 112850G. (Proceedings of SPIE, Vol. 11285).

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

Monolithic integration of up to 40 GHz Ge photodetectors in 3μm SOI

Vehmas, T., Kapulainen, M., Heimala, P., Delrosso, G., Sun, F., Gao, F. & Aalto, T., 2020, Silicon Photonics XV. Reed, G. T. & Knights, A. P. (eds.). International Society for Optics and Photonics SPIE, 112850V. (Proceedings of SPIE, Vol. 11285).

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

Polymer interposer for efficient light coupling into 3 μm silicon-on-insulator waveguides

Hiltunen, M., Harjanne, M. T., Vehmas, T., Wälchli, B., Heimala, P. & Aalto, T., 1 Jan 2020, Optical Interconnects XX. Schröder, H. & Chen, R. T. (eds.). International Society for Optics and Photonics SPIE, 112860I. (Proceedings of SPIE, Vol. 11286).

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

Precise length definition of active GaAs-based optoelectronic devices for low-loss silicon photonics integration

Tuorila, H., Viheriälä, J., Zia, N., Cherchi, M., Harjanne, M., Isoaho, R., Aalto, T. & Guina, M., 15 Feb 2020, In : Optics Letters. 45, 4, p. 943-946 4 p.

Research output: Contribution to journalArticleScientificpeer-review

2019

1.3μm u-bend traveling wave SOA devices for high efficiency coupling to silicon photonics

Viheriälä, J., Tuorila, H., Zia, N., Cherchi, M., Aalto, T. & Guina, M., 4 Mar 2019, Silicon Photonics XIV. Reed, G. T. & Knights, A. P. (eds.). International Society for Optics and Photonics SPIE, 7 p. 109230E. (Proceedings of SPIE, Vol. 10923).

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

Integrated faraday rotator

Cherchi, M., Petrov, A., Jalas, D., Harjanne, M., Aalto, T. & Eich, M., 28 Feb 2019, IPC No. G02B 6/126, Patent No. WO2019038477 A1, 22 Aug 2018, Priority date 22 Aug 2017, Priority No. US201762548467P

Research output: PatentPatent application

Open Access
5 Citations (Scopus)

Open-Access Silicon Photonics Platforms in Europe

Rahim, A., Goyvaerts, J., Szelag, B., Fedeli, J. M., Absil, P., Aalto, T., Harjanne, M., Littlejohns, C. G., Reed, G. T., Winzer, G., Lischke, S., Lars, Z., Knoll, D., Geuzebroek, D., Leinse, A., Geiselmann, M., Zervas, M., Jans, H., Stassen, A., Dominguez, C. & 5 others, Munoz, P., Domenech, D., Giesecke, A. L., Lemme, M. C. & Baets, R., 1 Sep 2019, In : IEEE Journal on Selected Topics in Quantum Electronics. 25, 5, 8712400.

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
Open Access

Si photonics using micron-size waveguides

Aalto, T., Cherchi, M., Harjanne, M., Sun, F., Vehmas, T., Bhat, S., Kapulainen, M., Hokkanen, A., Lehtimäki, L., Holmberg, H. & Haapalinna, A., 27 Feb 2019, Optical Components and Materials XVI. Digonnet, M. J. F. & Jiang, S. (eds.). International Society for Optics and Photonics SPIE, 12 p. 109140B. (Proceedings of SPIE, Vol. 10914).

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

2018

3μm silicon photonics

Aalto, T., Cherchi, M., Harjanne, M., Sun, F. & Kapulainen, M., 1 Jan 2018, 2018 Optical Fiber Communications Conference and Exposition, OFC 2018 - Proceedings. Optical Society of America OSA, Vol. Part F84-OFC 2018. p. 3-5 3 p. TU3A.5

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

2 Citations (Scopus)

A low-latency optical switch architecture using integrated μm SOI-based contention resolution and switching

Mourgias-Alexandris, G., Moralis-Pegios, M., Terzenidis, N., Cherchi, M., Harjanne, M., Aalto, T., Vyrsokinos, K. & Pleros, N., 1 Jan 2018, Optical Interconnects XVIII. Schröder, H. & Chen, R. T. (eds.). International Society for Optics and Photonics SPIE, p. 7 (Proceedings of SPIE, Vol. 10538).

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

Data Transmission at1.3 μmUsing Hybrid Integrated Silicon Interposer and GalnNAs/GaAs Electroabsorption Modulator

Guina, M., Sheehan, R. N., Isoaho, R., Viheriälä, J., Harjanne, M., Malacarne, A., Falconi, F., Aalto, T. & Peters, F. H., 2018, 2018 European Conference on Optical Communication, ECOC 2018. IEEE Institute of Electrical and Electronic Engineers, 8535166

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

Data transmission at 1300 nm using optical interposer comprising hybrid integrated silicon waveguide and dilute nitride electroabsorption modulator

Sheehan, R. N., Guina, M., Viheriälä, J., Isoaho, R., Harjanne, M., Azarello, F., Yang, M., Malacarne, A., Aalto, T. & Peters, F. H., 24 Dec 2018, In : Optics Express. 26, 26, p. 34336-34345 10 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
3 Citations (Scopus)

Enhanced silicon-on-insulator platform enabling new structures and applications

Haapalinna, A. & Aalto, T., 7 Mar 2018, 2017 IEEE SOI-3D-Subthreshold Microelectronics Unified Conference, S3S 2017. IEEE Institute of Electrical and Electronic Engineers, p. 1-3 3 p.

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

1 Citation (Scopus)

Light Escalators in Optical Circuits Between Thick and Thin Waveguides

Cherchi, M., Aalto, T. & Arpiainen, S., 25 Oct 2018, IPC No. G02B 6/14, Patent No. WO18193167 A1, 23 Apr 2018, Priority date 21 Apr 2017, Priority No. US20170488101P

Research output: PatentPatent application

Low loss GaInNAs/GaAs gain waveguides with U-bend geometry for single-facet coupling in hybrid photonic integration

Tuorila, H., Viheriälä, J., Cherchi, M., Aho, A. T., Aalto, T. & Guina, M., 23 Jul 2018, In : Applied Physics Letters. 113, 4, 041104.

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Low-Power 1.3-μm VCSEL Transmitter for Data Center Interconnects and beyond

Malacarne, A., Falconi, F., Neumeyr, C., Soenen, W., Porzi, C., Aalto, T., Rosskopf, J., Chiesa, M., Bauwelinck, J. & Bogoni, A., 24 Apr 2018, 43rd European Conference on Optical Communication, ECOC 2017. IEEE Institute of Electrical and Electronic Engineers, p. 1-3 3 p.

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

4 Citations (Scopus)

Multicast-enabling Optical Switch design employing Si Buffering and Routing Elements

Moralis-Pegios, M., Terzenidis, N., Mourgias-Alexandris, G., Cherchi, M., Harjanne, M., Aalto, T., Miliou, A., Vyrsokinos, K. & Pleros, N., 15 Apr 2018, In : IEEE Photonics Technology Letters. 30, 8, p. 712-715 4 p.

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

On-chip SOI Delay Line Bank for Optical Buffers and Time Slot Interchangers

Moralis-Pegios, M., Mourgias-Alexandris, G., Terzenidis, N., Cherchi, M., Harjanne, M., Aalto, T., Miliou, A., Pleros, N. & Vyrsokinos, K., 2018, In : IEEE Photonics Technology Letters. 30, 1, p. 31-34

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Optical interconnects based on VCSELs and low-loss silicon photonics

Aalto, T., Harjanne, M., Karppinen, M., Cherchi, M., Sitomaniemi, A., Ollila, J., Malacarne, A. & Neumeyr, C., 1 Jan 2018, Optical Interconnects XVIII. International Society for Optics and Photonics SPIE, 1053816. (Proceedings of SPIE, Vol. 10538).

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

1 Citation (Scopus)

Optical Transmitter Based on a 1.3-μm VCSEL and a SiGe Driver Circuit for Short-Reach Applications and beyond

Malacarne, A., Neumeyr, C., Soenen, W., Falconi, F., Porzi, C., Aalto, T., Rosskopf, J., Bauwelinck, J. & Bogoni, A., 1 May 2018, In : Journal of Lightwave Technology. 36, 9, p. 1527-1536 10 p.

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Semiconductor Optical Amplifier with U-bend Geometry for Simplified Coupling to Silicon Photonics Waveguides

Tuorila, H., Viheriälä, J., Cherchi, M., Aho, A., Aalto, T. & Guina, M., 15 Nov 2018, 2018 European Conference on Optical Communication, ECOC 2018. IEEE Institute of Electrical and Electronic Engineers, 8535103

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

Transceivers for 400G based on Hybrid Integrated Thick SOI and III/V Chips

Aalto, T., Harjanne, M., Vehmas, T., Karppinen, M., Sitomaniemi, A., Malacarne, A., Neumeyr, C. & Bauwelinck, J., 24 Apr 2018, 43rd European Conference on Optical Communication, ECOC 2017. IEEE Institute of Electrical and Electronic Engineers, Vol. 2017-September. p. 1-3 3 p.

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

2 Citations (Scopus)
2017

Fabrication tolerant flat-top interleavers

Cherchi, M., Sun, F., Kapulainen, M., Vehmas, T., Harjanne, M. & Aalto, T., 1 Jan 2017, Silicon Photonics XII. Knights, A. P. & Reed, G. T. (eds.). International Society for Optics and Photonics SPIE, 101080V. (Proceedings of SPIE, Vol. 10108).

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

4 Citations (Scopus)

Low-loss and polarization-insensitive photonic integrated circuit based on micron-scale SOI platform for High Density TDM PONs

Zhang, Q., Fu, S., Man, J., Li, Z., Cherchi, M., Heimala, P., Harjanne, M., Fei, S., Hiltunen, M., Aalto, T. & Zeng, L., 31 May 2017, 2017 Optical Fiber Communications Conference and Exhibition (OFC). Optical Society of America OSA, 3 p. 7937000

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

Optical buffering and time-slot interchanger with integrated si-based delay lines

Moralis-Pegios, M., Mourgias-Alexandris, G., Terzenidis, N., Cherchi, M., Harjanne, M., Aalto, T., Miliou, A., Pleros, N. & Vyrsokinos, K., 1 Jan 2017, Advanced Photonics 2017 (IPR, NOMA, Sensors, Networks, SPPCom, PS). Optical Society of America OSA, PTu1D.2. (OSA Technical Digest, Vol. F57).

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

Optical time-slot interchanger and Si-based delay lines towards integrated feed-forward buffers

Moralis-Pegios, M., Mourgias-Alexandris, G., Alexoudi, T., Cherchi, M., Harjanne, M., Aalto, T., Pleros, N. & Vyrsokinos, K., 17 Aug 2017, 2017 IEEE Photonics Society Summer Topicals Meeting Series (SUM). IEEE Institute of Electrical and Electronic Engineers, p. 21-22 2 p. 8012631

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

Optical waveguides for 1064 nm and chip pigtailing with PM fibers

Katila, P., Aalto, T., Heimala, P. & Leppihalme, M., 1 Jan 2017, International Conference on Space Optics, ICSO 2000. International Society for Optics and Photonics SPIE, Vol. 10569. 1056920

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

Open Access

Second order add/drop filter with a single ring resonator

Cherchi, M., Sun, F., Kapulainen, M., Vehmas, T., Harjanne, M. & Aalto, T., 1 Jan 2017, Silicon Photonics XII. Knights, A. P. & Reed, G. T. (eds.). International Society for Optics and Photonics SPIE, 101080B. (Proceedings of SPIE, Vol. 10108).

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

1 Citation (Scopus)

Self-assembled three-dimensional inverted photonic crystals on a photonic chip

Arpiainen, S., Vynck, K., Dekker, J., Kapulainen, M., Khunsin, W., Aalto, T., Mulot, M., Kocher-Oberlehrer, G., Zentel, R., Torres, C. M. S., Cassagne, D. & Ahopelto, J., 1 Sep 2017, In : Physica Status Solidi A: Applications and Materials Science. 214, 9, 1700039.

Research output: Contribution to journalArticleScientificpeer-review

Thick-SOI Echelle grating for any-to-any wavelength routing interconnection in multi-socket computing environments

Dabos, G., Pitris, S., Mitsolidou, C., Alexoudi, T., Fitsios, D., Cherchi, M., Harjanne, M., Aalto, T., Kanellos, G. T. & Pleros, N., 1 Jan 2017, Optical Interconnects XVII. Chen, R. T. & Schroder, H. (eds.). International Society for Optics and Photonics SPIE, 1010914. (Proceedings of SPIE, Vol. 10109).

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

6 Citations (Scopus)
2016

Chiral spiral waveguides based on MMI crossings: Theory and experiments

Cherchi, M., Ylinen, S., Harjanne, M., Kapulainen, M., Vehmas, T. & Aalto, T., 1 Jan 2016, Silicon Photonics XI. International Society for Optics and Photonics SPIE, 975215. (Proceedings of SPIE, Vol. 9752).

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

Euler bends and TIR mirrors for ultra-dense PIC integration on SOI

Aalto, T., Harjanne, M., Cherchi, M. & Ylinen, S., 2016, Book of abstracts of the 18th European Conference on Integrated Optics (ECIO 2016). Warsaw University of Technology, 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional

Open Access

Flat-top MZI filters: A novel robust design based on MMI splitters

Cherchi, M., Harjanne, M., Ylinen, S., Kapulainen, M., Vehmas, T. & Aalto, T., 1 Jan 2016, Silicon Photonics XI. International Society for Optics and Photonics SPIE, 975210. (Proceedings of SPIE, Vol. 9752).

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

Open Access
3 Citations (Scopus)

Hybrid integration of III-V optoelectronics, Si photonics and polymer waveguides for optical interconnects

Aalto, T., 2016.

Research output: Contribution to conferenceConference articleScientific

Integrating III-V, Si, and polymer waveguides for optical interconnects: RAPIDO

Aalto, T., Harjanne, M., Offrein, B. J., Caër, C., Neumeyr, C., Malacarne, A., Guina, M., Sheehan, R. N., Peters, F. H. & Melanen, P., 1 Jan 2016, Optical Interconnects XVI. International Society for Optics and Photonics SPIE, 97530D. (Proceedings of SPIE, Vol. 9753).

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

3 Citations (Scopus)

VTT's micron-scale silicon rib+strip waveguide platform

Aalto, T., Harjanne, M. & Cherchi, M., 1 Jan 2016, Silicon Photonics and Photonic Integrated Circuits V. International Society for Optics and Photonics SPIE, 98911G. (Proceedings of SPIE, Vol. 9891).

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

3 Citations (Scopus)
2015

Bent Optical Waveguide

Cherchi, M. & Aalto, T., 17 Sep 2015, IPC No. G02B6/02, Patent No. US2015260916 AA, Priority date 15 Oct 2013, Priority No. WO2013FI50987

Research output: PatentPatent application

Comparison of different types of MMI-resonators fabricated on a micron-scale SOI platform

Cherchi, M., Harjanne, M., Ylinen, S., Kapulainen, M., Vehmas, T. & Aalto, T., 27 Feb 2015, Silicon Photonics X. Reed, G. T. & Watts, M. R. (eds.). International Society for Optics and Photonics SPIE, 936713. (Proceedings of SPIE, Vol. 9367).

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

DPSK-demodulation based on ultra-compact micron-scale SOI platform

Vyrsokinos, K., Vagionas, C., Mitsolidou, C., Cherchi, M., Harjanne, M., Ylinen, S., Kapulainen, M., Aalto, T. & Miliou, A., 2015, Optical Fiber Communication Conference, OFC 2015. Optical Society of America OSA, W2A.14

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

3 Citations (Scopus)

Experimental demonstration of chiral spiral waveguides without waveguide crossings

Aalto, T., Cherchi, M., Ylinen, S., Kapulainen, M., Harjanne, M. & Vehmas, T., 2015, 2015 European Conference on Lasers and Electro-Optics: European Quantum Electronics Conference. Optical Society of America OSA, CH_6_1

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

Flat-top interleavers: A novel approach based on MMI splitters

Cherchi, M., Ylinen, S., Kapulainen, M., Harjanne, M., Vehmas, T. & Aalto, T., 2015, 2015 European Conference on Lasers and Electro-Optics : European Quantum Electronics Conference. Optical Society of America OSA, CI_P_7

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

Instantaneous frequency measurement system using four-wave mixing in an ultra-compact long silicon waveguide

Pagani, M., Morrison, B., Zhang, Y., Casas-Bedoya, A., Aalto, T., Harjanne, M., Kapulainen, M., Eggleton, B. J. & Marpaung, D., 30 Nov 2015, 2015 European Conference on Optical Communication (ECOC). IEEE Institute of Electrical and Electronic Engineers, 7341976

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

1 Citation (Scopus)

Low-error and broadband microwave frequency measurement in a silicon chip

Pagani, M., Morrison, B., Zhang, Y., Casas-Bedoya, A., Aalto, T., Harjanne, M., Kapulainen, M., Eggleton, B. J. & Marpaung, D., 2015, In : Optica. 2, 8, p. 751-756

Research output: Contribution to journalArticleScientificpeer-review

Open Access
48 Citations (Scopus)

Low-loss delay lines with small footprint on a micron-scale SOI platform

Cherchi, M., Harjanne, M., Vyrsokinos, K., Ylinen, S., Kapulainen, M., Vehmas, T. & Aalto, T., 27 Feb 2015, Silicon Photonics X . Reed, G. T. & Watts, M. R. (eds.). International Society for Optics and Photonics SPIE, 93670A. (Proceedings of SPIE, Vol. 9367).

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

1 Citation (Scopus)

Micron-scale silicon photonics with multi-mode interference couplers for chiral spirals and flat-top filters

Aalto, T., Cherchi, M., Ylinen, S., Kapulainen, M. & Harjanne, M., 2015, Northern Optics & Photonics 2015. University of Eastern Finland, 33

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

MMI resonators based on metal mirrors and MMI mirrors: An experimental comparison

Cherchi, M., Ylinen, S., Harjanne, M., Kapulainen, M. & Aalto, T., 9 Mar 2015, In : Optics Express. 23, 5, p. 5982-5993

Research output: Contribution to journalArticleScientificpeer-review

Open Access
6 Citations (Scopus)

Multi-wavelength transceiver integration on SOI for high-performance computing system applications

Aalto, T., Harjanne, M., Ylinen, S., Kapulainen, M., Vehmas, T., Cherchi, M., Neumeyr, C., Ortsiefer, M. & Malacarne, A., 3 Apr 2015, Optical Interconnects XV. Schröder, H. & Chen, R. T. (eds.). International Society for Optics and Photonics SPIE, (Proceedings of SPIE, Vol. 9368).

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

5 Citations (Scopus)