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Optical Engineering

Highly efficient polarization-independent grating coupler used in silica-based hybrid photodetector integration
Author(s): Hongqiang Li; Yu Liu; Meiling Zhang; Wenqian Zhou; Cheng Zhang; Enbang Li; Changyun Miao; Chunxiao Tang
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Paper 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.

Paper Details

Date Published: 7 May 2014
PDF: 6 pages
Opt. Eng. 53(5) 057105 doi: 10.1117/1.OE.53.5.057105
Published in: Optical Engineering Volume 53, Issue 5
Show Author Affiliations
Hongqiang Li, Tianjin Polytechnic Univ. (China)
Yu Liu, Tianjin Polytechnic Univ. (China)
Meiling Zhang, Tianjin Polytechnic Univ. (China)
Wenqian Zhou, Tianjin Polytechnic Univ. (China)
Cheng Zhang, Tianjin Polytechnic Univ. (China)
Enbang Li, Univ. of Wollongong (Australia)
Changyun Miao, Tianjin Polytechnic Univ. (China)
Chunxiao Tang, Tianjin Polytechnic Univ. (China)

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