Photonics Research, Volume. 10, Issue 6, 1484(2022)
Ultra-sharp silicon multimode waveguide bends based on double free-form curves
Fig. 1. Proposed MWB based on the DFFC design. DFFC consists of curve A and curve B, and
Fig. 2. Proper combinations of (a) curve A and (b) curve B are given. Here the ordinate represents a multiple of the equivalent radius.
Fig. 3. Simulation results of the DFFC–MWB with an input width
Fig. 4. Simulation results of the DFFC–MWB with an input width
Fig. 5. Transmittance spectra of the MWB based on the DFFC with
Fig. 6. Microscopic view of the fabricated silicon multimode bends with four mode channels. The multiplexer and demultiplexer are connected with (a) straight multimode waveguide or (b) eight cascaded 90° MWBs based on the DFFC. (c) SEM image of the cascaded MWBs.
Fig. 7. Measured spectra of the normalized transmittances of a single four-mode waveguide bend. (a)–(h) Measurement results of a single 90° four-mode bend based on (a)–(d) DFFC or (e)–(h) SFFC.
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Shangsen Sun, Zhiqiang Yang, Juanli Wang, Runsen Zhang, Fengchun Zhang, Ning Zhu, Lei Wan, Zhaohui Li. Ultra-sharp silicon multimode waveguide bends based on double free-form curves[J]. Photonics Research, 2022, 10(6): 1484
Category: Silicon Photonics
Received: Oct. 18, 2021
Accepted: Apr. 24, 2022
Published Online: May. 25, 2022
The Author Email: Ning Zhu (zhuning@scnu.edu.cn), Lei Wan (wanlei@jnu.edu.cn), Zhaohui Li (lzhh88@sysu.edu.cn)