[19p-A310-1~13] 4.2 Photonics Devices, Photonic Integrated Circuit and Silicon Photonics

15:45 〜 16:00英語発表

[19p-A310-9] Inverse Design of Low Back Reflection Grating Coupler

〇Yuduan Wang¹, Tsuyoshi Horikawa¹, Ohiso Yoshitaka¹, Tomohiro Amemiya¹, Nobuhiko Nishiyama^1,2,3 (1.Tokyo Tech., 2.IIR, 3.PETRA)

キーワード：

Inverse Design、Grating Coupler、Back Reflection

Grating couplers (GC) on silicon-on-insulator (SOI) have an excellent interconnectivity between photonic integrated circuit (PIC) device and fibers. Traditional theory-first hand-turning design method by sweep parameters is time-consuming to perform. In contrast, the target-first inverse design optimization algorithm enables obtaining the best solution in just a few iterations. Although such inverse design was already applied to GC, only transmission characteristics was considered as the target. However, back-reflection is also critical for PICs, especially the lasing performance of semiconductor lasers. In this work, we report Figure of Merit (FoM) dependance of the coupling efficiency as well as back-reflection of GC.The result shows the back reflections at 1550 nm is -47.45 dB and coupling efficiency is 66.00%. And -39.7dB back reflection with 65.46% coupling efficiency for manufacturable structure.