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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 19,
  • Issue 12,
  • pp. 121301-
  • (2021)

High-performance ultra-compact polarization splitter-rotators based on dual-etching and tapered asymmetrical directional coupler

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Abstract

High-performance ultra-compact polarization splitter-rotators (PSRs) are designed and experimentally demonstrated, using dual etching and a tapered asymmetrical directional coupler. First, two novel PSRs are designed with nanowire and subwavelength grating cross-port waveguides and verified in simulations. Then, one of the two PSRs is fabricated. Experiment results reveal that the extinction ratio is higher than 28 dB or 32 dB at 1550 nm for the launched fundamental transverse magnetic or the transverse electric modes, while the corresponding insertion loss and polarization conversion loss are 0.33 dB and 0.18 dB, respectively.

© 2021 Chinese Laser Press

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