On-chip polarization beam splitter design for optical coherence tomography

Polarization beam splitters (PBSs) are central elements for polarization handling. Here, we present the design of an ultra-broadband, low-loss, and easy-to-fabricate PBS based on a silicon nitride asymmetrical directional coupler for polarization-sensitive optical coherence tomography systems. The p...

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Published in:Optics express 2018-12, Vol.26 (25), p.33349-33355
Main Authors: Heemskerk, E, Akca, B I
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Language:English
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description Polarization beam splitters (PBSs) are central elements for polarization handling. Here, we present the design of an ultra-broadband, low-loss, and easy-to-fabricate PBS based on a silicon nitride asymmetrical directional coupler for polarization-sensitive optical coherence tomography systems. The phase difference between transverse electric and transverse magnetic modes is introduced by using straight waveguides with different widths and an offset between them. A bent waveguide is placed close to the end of the through port in order to increase the operating bandwidth (i.e., more than 220 nm with greater than 15 dB of extinction). The overall device length is only 400 µm.
doi_str_mv 10.1364/OE.26.033349
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title On-chip polarization beam splitter design for optical coherence tomography
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