Highly efficient polarization-independent grating coupler used in silica-based hybrid photodetector integration

Hongqiang Li; Yu Liu; Meiling Zhang; Wenqian Zhou; Cheng Zhang; Enbang Li; Changyun Miao; Chunxiao Tang

doi:10.1117/1.OE.53.5.057105

7 May 2014 Highly efficient polarization-independent grating coupler used in silica-based hybrid photodetector integration

Hongqiang Li, Yu Liu, Meiling Zhang, Wenqian Zhou, Cheng Zhang, Enbang Li, Changyun Miao, Chunxiao Tang

Author Affiliations +

Optical Engineering, Vol. 53, Issue 5, 057105 (May 2014). https://doi.org/10.1117/1.OE.53.5.057105

Abstract

A highly efficient polarization-independent output grating coupler was optimized and designed based on silicon-on-insulator used for silica-based hybrid photodetector integration in an arrayed waveguide grating demodulation-integrated microsystem. The finite-difference time-domain (FDTD) method optimizes coupling efficiency by enabling the design of the grating period, duty cycle, etch depth, grating length, and polarization-dependent loss (PDL). The output coupling efficiencies of both the transverse electric (TE) and transverse magnetic (TM) modes are higher than 60% at 1517 to 1605 nm and ∼67% at around 1550 nm. The designed grating exhibits the desired property at the 3-dB bandwidth of 200 nm from 1450 to 1650 nm and a PDL <0.5 dB of 110 nm from 1513 to 1623 nm. The power absorption efficiency at 1550 nm for TE and TM modes reaches 78% and 70%, respectively. Both the power absorption efficiency of TE mode and that of TM mode are over 70% in a broad band of 1491 to 1550 nm.

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Hongqiang Li, Yu Liu, Meiling Zhang, Wenqian Zhou, Cheng Zhang, Enbang Li, Changyun Miao, and Chunxiao Tang "Highly efficient polarization-independent grating coupler used in silica-based hybrid photodetector integration," Optical Engineering 53(5), 057105 (7 May 2014). https://doi.org/10.1117/1.OE.53.5.057105

Published: 7 May 2014

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