Huashan Yang, Fuling Zhang, Lemeng Leng, Zhaobang Zeng, Yue Shao, Hui Zhang, Nan Yang, Xiangning Chen, "Grating coupler efficiency enhancement by double layer interference," Chin. Opt. Lett. 17, 030501 (2019)

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- Chinese Optics Letters
- Vol. 17, Issue 3, 030501 (2019)

Fig. 1. (a) Proposed GC efficiency enhancing scheme with an 8° polished APF with its facet parallel to the chip surface. (b) Cross-sectional schematic of the 2D-FDTD model of a GC coupling with an 8° tilted APF. (c) Schematic of the light interferences in the air gap layer.

Fig. 2. (a) Surface plot for simulated CE with different and . (b) Simulated insertion loss of the GC with (blue) and (red) coupling with an APF (solid line) and a 12° tilted SMF (dashed line) with from 0.5 to . (c) Simulated transmission (solid line) and reflection (dashed line) spectra of APF (red) and 12° tilted SMF (blue) coupled GC with .

Fig. 3. (a) Simulated enhancing effect of the air gap at different tilting and polishing angles. (b) Peak CE drops 0.15 dB as increases to .

Fig. 4. (a) Fiber alignment tolerance in the direction for the APF (red) and SMF (blue). (b) Enhancing effect by directionality only and various APF with different . (c) Maximum enhancing effect at various (red) and directionality’s 1.06 dB enhancing effect.

Fig. 5. (a) Simulated (solid line) and measured (× mark) GC insertion loss with from 1.2 to coupling with an APF with . Inset: optical microscopy image of the “GC loop”. (b) Measured transmission spectra of the GC with COX coupling with SMF (blue) and APF (red).

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