A 2 μm Wavelength Band Low-Loss Spot Size Converter Based on Trident Structure on the SOI Platform

Zhutian Wang; Chenxi Xu; Zhiming Shi; Nan Ye; Hairun Guo; Fufei Pang; Yingxiong Song

doi:10.3390/mi15040530

A 2 μm Wavelength Band Low-Loss Spot Size Converter Based on Trident Structure on the SOI Platform

Micromachines (Basel). 2024 Apr 15;15(4):530. doi: 10.3390/mi15040530.

Authors

Zhutian Wang¹, Chenxi Xu¹, Zhiming Shi¹, Nan Ye¹, Hairun Guo¹, Fufei Pang¹, Yingxiong Song¹

Affiliation

¹ The Key Laboratory of Specialty Fiber Optics and Optical Access Networks, School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China.

Abstract

A 2 μm wavelength band spot size converter (SSC) based on a trident structure is proposed, which is coupled to a lensed fiber with a mode field diameter of 5 μm. The cross-section of the first segment of the tapered waveguide structure in the trident structure is designed as a right-angled trapezoidal shape, which can further improve the performance of the SSC. The coupling loss of the SSC is less than 0.9 dB in the wavelength range of 1.95~2.05 μm simulated by FDTD. According to the experimental results, the lowest coupling loss of the SSC is 1.425 dB/facet at 2 μm, which is close to the simulation result. The device is compatible with the CMOS process and can provide a good reference for the development of 2 μm wavelength band integrated photonics.

Keywords: 2 μm; integrated photonics; photonics passive devices; spot size converter.

Abstract

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