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15 February 2022 Ultra-broadband, compact, CMOS compatible arbitrary ratio power splitter with very low excess loss
Han Liao, Haiyang Huang, Yingxuan Zhao, Xiaojuan She, Rui Huang, Yang Li, Lue Tao, Zijian Zhu, Xiang Liu, Zhen Sheng, Fuwan Gan
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Proceedings Volume 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021); 121664A (2022) https://doi.org/10.1117/12.2617210
Event: Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 2021, Hong Kong, Hong Kong
Abstract
We designed an ultra-broadband, compact, CMOS compatible, arbitrary ratio power splitter based on 220-nm-thick silicon-on-insulator (SOI) platform. The geometry of power splitter was digitalized into 20 parameters. For each different power splitting ratio (PSR), these 20 parameters were optimized to achieve low excess loss, using variational finite difference time domain (varFDTD) simulation and adjoint shape optimization. After many iterations of optimization, the structure was finally determined. The simulated excess loss was optimized to a low value, which was below 0.13dB. The PSR variation was limited to less than 0.459dB over 500 nm, across the O band and C band, showing that the PSR of the device was wavelength independent. An order of magnitude smaller than other kind of typical power splitters, the footprint of the proposed device is only about 1.2 μm × 2 μm, ensuring the compactness of the photonic integrated circuits (PICs). Simultaneously, it is easy to fabrication since the boundaries are smooth with a fairly large feature size.
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Han Liao, Haiyang Huang, Yingxuan Zhao, Xiaojuan She, Rui Huang, Yang Li, Lue Tao, Zijian Zhu, Xiang Liu, Zhen Sheng, and Fuwan Gan "Ultra-broadband, compact, CMOS compatible arbitrary ratio power splitter with very low excess loss", Proc. SPIE 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 121664A (15 February 2022); https://doi.org/10.1117/12.2617210
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KEYWORDS
Photonic integrated circuits
Waveguides
Silicon
Refractive index
Silica
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