Fabrication of semi-cylindrical channels for one-dimensional fiber array edge couplers
Abstract
Photonic Integrated Circuits (PICs) are essential for high-speed and compact optoelectronic applications, yet efficient optical coupling to PIC remains a critical challenge, where minimizing insertion losses is crucial for high-performance applications. Fiber arrays are commonly used as edge couplers for PICs. In this work, we demonstrate the fabrication of semi-cylindrical channels on glass substrates using femtosecond laser micromachining for fiber arrays edge couplers. This method enables the formation of narrow, well-defined grooves in glass substrates with submicron accuracy, facilitating reliable fiber positioning for improved coupling efficiency. Experimental results demonstrate the feasibility of this approach for dense fiber arrays, with a narrow separation of \sim 3 {\mu}m.
Keywords
Cite
@article{arxiv.2504.04157,
title = {Fabrication of semi-cylindrical channels for one-dimensional fiber array edge couplers},
author = {Sakthi Priya Amirtharaj and Saandeep Peesapati and Sirshi S Ram and Sivarama Krishnan and Anil Prabhakar},
journal= {arXiv preprint arXiv:2504.04157},
year = {2025}
}