Dual-Wavelength Polarization Independent Grating Coupler Design Based on Silicon-on-Insulator [thesis]

Tianyi Hao
Silicon photonics has emerged as one of the most popular areas in integrated optics because of its compatibility with CMOS fabrication processes and its potential for low cost and mass production. To enable efficient fiber-to-chip coupling of light, one key component is a grating coupler. With an increasing demand for wavelength-divisionmultiplexing systems in fiber-to-the-home network services, low-cost dual-band (O-and C-bands) chip transceivers are required. In this thesis, the universal
more » ... , the universal design methodology of conventional and subwavelength grating couplers has been presented. Firstly, a vertical incident wavelength splitting grating coupler that can split 1310 nm and 1550 nm wavelength light into two directions is shown. Afterward, a polarization splitting grating coupler that can work for both C-and O-band with a flexible incident angle is also demonstrated. In the last part of this thesis, a novel dual-band subwavelength polarization independent grating coupler works as a wavelength demultiplexer is proposed. It has transmissions of ~30% and 3-dB bandwidths of 80-100 nm for both TE and TM polarizations of O-and C-band. I would like to thank my supervisor, professor Winnie N. Ye, for all the help and guidance she provided. She can always show the most up-to-date technology and theories to us and lead me to the right path of studying and researching. I would also like to extend my gratitude to all other professors taught me, Dr.
doi:10.22215/etd/2020-14305 fatcat:kamedqq3frghlkmvmacyf5j2fe