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   Venkatesulu, Erica ; Shaw, Joseph A. ( January 2022 , Applied Optics)
2. Grating-Coupled Silicon-on-Sapphire Polarization Rotator Operating at Mid-Infrared Wavelengths

   https://doi.org/10.1109/LPT.2019.2896560  

   Rostamian, Ali ; Guo, Joel ; Chakravarty, Swapnajit ; Yan, Hai ; Chung, Chi-Jui ; Heidari, Elham ; Chen, Ray T. ( March 2019 , IEEE Photonics Technology Letters)
3. Inverse-designed, normal incidence polarizing and polarization demultiplexing grating couplers for multi-core fiber

   Michael J. Probst, Alec M. ( October 2022 , IEEE International Photonics Conference)

   We experimentally demonstrate normal-incidence grating couplers designed using topology optimization to couple into multi-core fiber. The insertion loss of the polarizing and polarization demultiplexing gratings was –5.5 dB and –7.7 dB, which is within 0.8 dB of the performance obtained using a fiber array. 

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4. Broadband integrated polarization splitter and rotator using subwavelength grating claddings

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   Borhan Mia, Md ; Jaidye, Nafiz ; Ahmed, Ishtiaque ; Ahmed, Syed Z. ; kim, Sangsik ( January 2023 , Optics Express)

   We present a broadband integrated photonic polarization splitter and rotator (PSR) using adiabatically tapered coupled waveguides with subwavelength grating (SWG) claddings. The PSR adiabatically rotates and splits the fundamental transverse-magnetic (TM₀) input to the fundamental transverse-electric (TE₀) mode in the coupler waveguide, while passing the TE₀input through the same waveguide. The SWGs work as an anisotropic metamaterial and facilitate modal conversions, making the PSR efficient and broadband. We rigorously present our design approaches in each section and show the SWG effect by comparing with and without the SWG claddings. The coupling coefficients in each segment explicitly show a stronger coupling effect when the SWGs are included, confirmed by the coupled-mode theory simulations. The full numerical simulation shows that the SWG-PSR operates at 1500–1750 nm (≈250 nm) wavelengths with an extinction ratio larger than 20 dB, confirmed by the experiment for the 1490–1590 nm range. The insertion losses are below 1.3 dB. Since our PSR is designed based on adiabatical mode evolution, the proposed PSR is expected to be tolerant to fabrication variations and should be broadly applicable to polarization management in photonic integrated circuits.

    

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5. Polarization-insensitive 1D grating coupler based on a zero-birefringence subwavelength corelet waveguide

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   Zhang, Bohan ; Schiller, Mark ; Al Qubaisi, Kenaish ; Onural, Deniz ; Khilo, Anatol ; Naughton, Michael J. ; Popović, Miloš A. ( June 2022 , Optics Letters)

   Grating coupler devices provide efficient, foundry-compatible vertical fiber-to-chip coupling solutions in integrated photonic platforms. However, standard grating coupler designs are highly polarization sensitive, which hinders their adoption. We present a new, to the best of our knowledge, type of 1D polarization-insensitive grating coupler (PIGC) that is based on a zero-birefringence subwavelength “corelet” waveguide. We demonstrate a PIGC for coupling in the telecommunications O-band in a 45-nm-node monolithic silicon-on-insulator (SOI) CMOS electronic-photonic platform, with measured insertion losses of 6.7 and 6.1 dB to transverse electric and transverse magnetic polarizations, respectively, and a ±1-dB polarization dependent loss bandwidth of 73 nm.

    

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