Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Polarization Insensitive CWDM Optical Demultiplexer Based on Polarization Splitter-rotator and Delayed Interferometric Optical Filter

  • Seok-Hwan Jeong (Department of Electronic Materials Engineering, The University of Suwon) ;
  • Heuk Park (Network Research Division, Electronics and Telecommunications Research Institute) ;
  • Joon Ki Lee (Network Research Division, Electronics and Telecommunications Research Institute)
  • Received : 2022.10.17
  • Accepted : 2023.02.13
  • Published : 2023.04.25
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Abstract

We theoretically analyze and experimentally demonstrate a polarization-diversified four-channel optical demultiplexer (DeMUX) comprising a hybrid mode conversion-type polarization splitter rotator (PSR) and delayed Mach-Zehnder interferometer optical DeMUX for use in coarse wavelength division multiplexing (CWDM)-based optical interconnect applications. The Si wire-based device fabricated by a complementary metal-oxide semiconductor-compatible process exhibited nearly the same filter spectral response irrespective of the input polarization state under the PSR. The device had an extremely low insertion loss of <1.0 dB, polarization-dependent loss of <1.0 dB, and interchannel imbalance of <0.5 dB, suppressing unwanted wavelength and polarization crosstalk from neighboring channels of <-20 dB at each peak transmission channel grid.

Keywords

Acknowledgement

This work was supported by a grant from the Electronics and Telecommunications Research Institute (ETRI) funded by the ICT R&D program of MSIT/IITP [2019-0-00002, Development of Optical Cloud Networking Core Technology]. This work was supported by a research grant from the University of Suwon in 2022.

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