AI Article Synopsis
- Grating couplers are crucial for connecting optical fibers to chips in integrated photonics but traditionally face challenges due to their sensitivity to light polarization.
- The researchers introduced a new type of grating coupler called a polarization-insensitive grating coupler (PIGC) that utilizes a special waveguide to minimize polarization issues.
- Their PIGC, designed for telecommunications applications, showed promising performance with low insertion losses and a wide bandwidth for polarization-dependent loss, making it a viable solution for silicon photonic platforms.
Article Abstract
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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| http://dx.doi.org/10.1364/OL.459306 | DOI Listing |
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