Packaging-enhanced optical fiber-chip interconnect with enlarged grating coupler and multimode fiber

Optical I/O plays a crucial role in the lifespan of lab-on-a-chip systems, from preliminary testing to operation in the target environment. However, due to the precise alignments required, efficient and reliable fiber-to-chip connections remain challenging, yielding inconsistent test results and uns...

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Bibliographic Details
Published in:arXiv.org 2022-01
Main Authors: Wang, Chao, Chang, Chingwen, Midkiff, Jason, Asghari, Aref, Fan, James, Zhou, Jianying, Xu, Xiaochuan, Tian, Huiping, Chen, Ray T
Format: Article
Language:English
Subjects:
Couplers
Fiber optics
Optical fibers
Online Access:Get full text
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Summary:Optical I/O plays a crucial role in the lifespan of lab-on-a-chip systems, from preliminary testing to operation in the target environment. However, due to the precise alignments required, efficient and reliable fiber-to-chip connections remain challenging, yielding inconsistent test results and unstable packaged performance. To overcome this issue, for use in single mode on-chip systems, we propose the incorporation of area-enlarged grating couplers working in conjunction with multimode fibers. This combination enables simpler, faster, and more reliable connections than the traditional small area grating coupler with single-mode fiber. In this work, we experimentally demonstrate a 3dB in-plane (X, Y) spatial tolerance of (10.2 {\mu}m, 17.3 {\mu}m) for the large area configuration, being at least (2.49, 3.33) times that of the small area one, and agreeing well with theoretical calculations. The simple concept is readily applicable to a range of photonic systems where cheaper more robust optical I/O is desired.
ISSN:2331-8422