Journal
OPTICS EXPRESS
Volume 25, Issue 22, Pages 26861-26874Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.026861
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Funding
- Corning Corporation
- National Science Foundation (NSF) Industrial Innovation and Partnerships (IIP) for the Industry/University Cooperative Research Center for Metamaterials [1068028]
- Directorate For Engineering
- Div Of Industrial Innovation & Partnersh [1068028, 1624572] Funding Source: National Science Foundation
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [1624679] Funding Source: National Science Foundation
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The forked grating coupler (FGC) is an optical vortex interface for silicon photonics. Using the structure of a Bragg grating coupler with a calculated forked hologram, the FGC couples optical vortex modes into confined waveguide modes of a photonic integrated circuit. Design methodologies are given, as well as measured performance data from fabricated devices. Data are analyzed with a variety of metrics. The effectiveness of design features are evaluated. Advanced FGC designs are demonstrated with focused forked gratings, allowing feed length to be reduced, and with apodization improving vortex mode fidelity. Some configurations achieve over 25 dB multiplexing crosstalk isolation. (C) 2017 Optical Society of America
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