RF beam steering using a 5-bit, 4-channel reconfigurable optical true time delay chip on a 3 µm SOI platform

Somnath Paul; Jussi Säily; Markus Schröder; Timo Aalto

doi:10.1117/12.3101738

RF beam steering using a 5-bit, 4-channel reconfigurable optical true time delay chip on a 3 µm SOI platform

Somnath Paul
, Jussi Säily
, Markus Schröder
, Timo Aalto

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

Abstract

We demonstrate an optical true-time-delay (OTTD)–based RF beamforming system using a 5-bit, 4-channel OTTD chip fabricated on VTT’s low-loss 3-μm SOI platform. Operating in the C-band, the device offers 32 delay states (0 – 100 ps), enabling full 2π phase control at 10 GHz. The platform’s ~0.1 dB/cm loss supports long delay lines. At the same time, OTTD-based beamforming provides advantages in power efficiency, bandwidth, footprint, cost, and EMI immunity, positioning it as a promising technology for future 6G systems.

Original language	English
Title of host publication	Integrated Photonics Platforms IV
Editors	Peter O'Brien, Delphine Marris-Morini, Dries Van Thourhout
Publisher	International Society for Optics and Photonics SPIE
Volume	141000Q
DOIs	https://doi.org/10.1117/12.3101738
Publication status	Published - 29 May 2026
MoE publication type	A4 Article in a conference publication
Event	SPIE Photonics Europe, 2026 - Strasbourg, France Duration: 13 Apr 2026 → 17 Apr 2026

Publication series

Series	Proceedings of SPIE
Volume	14100
ISSN	0277-786X

Conference

Conference	SPIE Photonics Europe, 2026
Country/Territory	France
City	Strasbourg
Period	13/04/26 → 17/04/26

Funding

This work was supported by an internal grant from VTT.

Access to Document

10.1117/12.3101738

Cite this

Paul, Somnath ; Säily, Jussi ; Schröder, Markus et al. / RF beam steering using a 5-bit, 4-channel reconfigurable optical true time delay chip on a 3 µm SOI platform. Integrated Photonics Platforms IV. editor / Peter O'Brien ; Delphine Marris-Morini ; Dries Van Thourhout. Vol. 141000Q International Society for Optics and Photonics SPIE, 2026. (Proceedings of SPIE, Vol. 14100).

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title = "RF beam steering using a 5-bit, 4-channel reconfigurable optical true time delay chip on a 3 µm SOI platform",

abstract = "We demonstrate an optical true-time-delay (OTTD)–based RF beamforming system using a 5-bit, 4-channel OTTD chip fabricated on VTT{\textquoteright}s low-loss 3-μm SOI platform. Operating in the C-band, the device offers 32 delay states (0 – 100 ps), enabling full 2π phase control at 10 GHz. The platform{\textquoteright}s \textasciitilde{}0.1 dB/cm loss supports long delay lines. At the same time, OTTD-based beamforming provides advantages in power efficiency, bandwidth, footprint, cost, and EMI immunity, positioning it as a promising technology for future 6G systems.",

author = "Somnath Paul and Jussi S{\"a}ily and Markus Schr{\"o}der and Timo Aalto",

year = "2026",

month = may,

day = "29",

doi = "10.1117/12.3101738",

language = "English",

volume = "141000Q",

series = "Proceedings of SPIE",

publisher = "International Society for Optics and Photonics SPIE",

editor = "Peter O'Brien and Delphine Marris-Morini and \{Van Thourhout\}, Dries",

booktitle = "Integrated Photonics Platforms IV",

address = "United States",

note = "SPIE Photonics Europe, 2026 ; Conference date: 13-04-2026 Through 17-04-2026",

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Paul, S , Säily, J, Schröder, M & Aalto, T 2026, RF beam steering using a 5-bit, 4-channel reconfigurable optical true time delay chip on a 3 µm SOI platform. in P O'Brien, D Marris-Morini & D Van Thourhout (eds), Integrated Photonics Platforms IV. vol. 141000Q, International Society for Optics and Photonics SPIE, Proceedings of SPIE, vol. 14100, SPIE Photonics Europe, 2026, Strasbourg, France, 13/04/26. https://doi.org/10.1117/12.3101738

RF beam steering using a 5-bit, 4-channel reconfigurable optical true time delay chip on a 3 µm SOI platform. / Paul, Somnath ; Säily, Jussi; Schröder, Markus et al.
Integrated Photonics Platforms IV. ed. / Peter O'Brien; Delphine Marris-Morini; Dries Van Thourhout. Vol. 141000Q International Society for Optics and Photonics SPIE, 2026. (Proceedings of SPIE, Vol. 14100).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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N2 - We demonstrate an optical true-time-delay (OTTD)–based RF beamforming system using a 5-bit, 4-channel OTTD chip fabricated on VTT’s low-loss 3-μm SOI platform. Operating in the C-band, the device offers 32 delay states (0 – 100 ps), enabling full 2π phase control at 10 GHz. The platform’s ~0.1 dB/cm loss supports long delay lines. At the same time, OTTD-based beamforming provides advantages in power efficiency, bandwidth, footprint, cost, and EMI immunity, positioning it as a promising technology for future 6G systems.

AB - We demonstrate an optical true-time-delay (OTTD)–based RF beamforming system using a 5-bit, 4-channel OTTD chip fabricated on VTT’s low-loss 3-μm SOI platform. Operating in the C-band, the device offers 32 delay states (0 – 100 ps), enabling full 2π phase control at 10 GHz. The platform’s ~0.1 dB/cm loss supports long delay lines. At the same time, OTTD-based beamforming provides advantages in power efficiency, bandwidth, footprint, cost, and EMI immunity, positioning it as a promising technology for future 6G systems.

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M3 - Conference article in proceedings

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BT - Integrated Photonics Platforms IV

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Paul S , Säily J, Schröder M, Aalto T. RF beam steering using a 5-bit, 4-channel reconfigurable optical true time delay chip on a 3 µm SOI platform. In O'Brien P, Marris-Morini D, Van Thourhout D, editors, Integrated Photonics Platforms IV. Vol. 141000Q. International Society for Optics and Photonics SPIE. 2026. (Proceedings of SPIE, Vol. 14100). doi: 10.1117/12.3101738

RF beam steering using a 5-bit, 4-channel reconfigurable optical true time delay chip on a 3 µm SOI platform

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