DOI: https://doi.org/10.14710/jpa.v5i2.17980

Coupling Efficiency of a Spot Size Converter for Optical Fiber-Chip Connections

*Wildan Panji Tresna orcid scopus  -  Research center for Photonics, National Research and Innovation Agency, Banten, Indonesia
Dedi Riana  -  Department of Physics, Malang State Islamic University of Maulana Malik Ibrahim, Malang, Indonesia
Reza Rendian Septiawan scopus  -  Computer Engineering Department, School of Electrical Engineering, Telkom University, Bandung, Indonesia
Received: 13 Apr 2023; Revised: 19 May 2023; Accepted: 20 May 2023; Available online: 31 May 2023; Published: 1 Jun 2023.

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Abstract

The light propagation in optical waveguide must be able to maintain low propagation loss, low coupling loss and scattering loss condition, especially in the junction. In this research, a spot size converter is proposed to
preserve the lowest coupling loss. This optical converter is composed of a single mode optical fiber (SiO2) including inversed taper. The optical input signal from the optical fiber is launched into photonic integrated circuits
and then coupled into the Si-Slab waveguide. Furthermore, linear form with the length dependence has been studied to obtain the optimal position of optical fiber and the chip and analyzed the coupling efficiency of it. The
purpose of this research is to procure the optimal form of spot size converter. The simulation result shows the coupling loss of linear form is 0.62 dB and 0.24 dB on TE and TM mode condition respectively. Along with the increase in the taper length, the coupling loss obtained tends to decrease as well. So that, it can be assumed the design of a linear form with 100 μm taper length provides the highest coupling efficie ncy.

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Keywords: Coupling loss, Optical fiber, Photonic integrated circuits, Spot size converter

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