Mr. Xiaochen Xin Profile

Xiaochen Xin

SPIE Involvement:

Author | Student Chapter Treasurer

Publications (4)

Proceedings Article | 31 May 2023 Presentation + Paper

Silicon-based surface gratings for efficient fiber-chip and free-space beam coupling

Daniel Benedikovic, William Fraser, Radovan Korcek, Xiaochen Xin, Yousef Karimi Yonjali, Carlos Alonso-Ramos, Laurent Vivien, Pavel Cheben, Jens Schmid, Maziyar Milanizadeh, Tom Smy, Ahmad Atieh, Winnie Ye

Proceedings Volume 12575, 1257507 (2023) https://doi.org/10.1117/12.2665440

KEYWORDS: Silicon nitride, Silicon, Optical gratings, Waveguides, Phased array optics, Silicon photonics, Photonic metamaterials, Optical antennas, Integrated photonics, Antennas

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Silicon photonics has established itself as a key integration platform, leveraging high-quality materials and large-scale manufacturing using mastered toolsets of complementary metal-oxide-semiconductor (CMOS) foundries. Chip-scale photonics offer unique promises for dense integration of versatile optical functions through compact and high-performance building blocks. Integrated photonics is now competing technology for many applications, spanning from telecom/datacom and interconnects up to quantum sciences and light detection and ranging (LIDAR) systems, among others. However, the lack of low-loss input/output chip interfaces can be prohibitive to successfully deploy multi-diverse device applications. Low coupling loss is essential in reducing overall power budget in photonic systems, impacting on-chip integration level. The light coupling from an off-chip environment into the planar waveguide platforms has always been a challenging research problem since the early years of integrated photonics. Optical interfaces formed on a photonic chip surface, rather than implemented on a chip edge, have been widely used to access photonic circuits with optical fibers or enabling free-space coupling of light beams. Surface gratings can be positioned at arbitrary locations and/or arranged in pre-defined patterns on the chip, facilitating wafer-scale testing and optical packaging. In this work, we present our recent progress in the development of silicon-based surface gratings for use in fiber-to-chip and free-space beam coupling. In particular, we discuss prospective design approaches to develop low-loss surface grating couplers implemented on silicon-on-insulator (SOI), silicon nitride (SiN), and hybrid silicon-silicon nitride (Si-SiN) platforms, allowing to approach a coupling loss below -1 dB. Among these, we also cover contemporary advances in compact silicon metamaterial nano-antennas for dense optical phased arrays, obtaining high a diffraction performance (> 90%) and wideband operation (> 200 nm) simultaneously.

Proceedings Article | 17 March 2023 Poster + Paper

Silicon-based polarization-insensitive optical antennas

Xiaochen Xin, Daniel Benedikovic, Winnie Ye

Proceedings Volume 12424, 124240W (2023) https://doi.org/10.1117/12.2646565

KEYWORDS: Antennas, Polarization gratings, Silicon, Polarization, Optical gratings, Diffraction gratings, Optical antennas, Design and modelling, Waveguides, Diffraction

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Proceedings Article | 17 March 2023 Presentation

Design and analysis of on-chip optical phase array systems for satellite communications

Hugh Podmore, Akash Chauhan, Brett Poulsen, Michael Zylstra, Xiaochen Xin, Mackenzie Essington, Ahmed Elsharabasy, M. Ruhul Fatin, Nicholas Zonta, Greg Iu, Alan Scott, Tamara Djokic, Jayshri Sabarinathan, Winnie Ye, Amr Helmy, Regina Lee

Proceedings Volume PC12425, PC124250H (2023) https://doi.org/10.1117/12.2657144

KEYWORDS: Satellite communications, Optical arrays, Telecommunications, Satellites, Free space optics, Optical components, Optical communications, Free space optical communications, Control systems, Chemical elements

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Proceedings Article | 17 March 2023 Presentation

Integrated silicon photonic optical phased arrays with large beam steering and high resolution

Winnie Ye, Daniel Benedikovic, Qiankun Liu, Shahrzad Khajavi, Daniele Melati, Pavel Cheben, Tom Smy, Ahmad Atieh, Alejandro Sánchez Postigo, Jens Schmid, Dan-Xia Xu, Xiaochen Xin

Proceedings Volume PC12425, PC124250G (2023) https://doi.org/10.1117/12.2650465

KEYWORDS: Beam steering, Phased array optics, Silicon photonics, LIDAR, Silicon, Optical components, Chemical elements, Unmanned vehicles, Solid state physics, Satellite communications

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