Physics

Diffraction grating

Optics

Coupling (piping)

Blazed grating

Physical chemistry

Crosstalk

Chemistry

Metallurgy

Materials science

Optical fiber

Polarization (electrochemistry)

Coupling loss

Grating

Optoelectronics

Wavelength

IEEE photonics journal

We demonstrate highly efficient couplers in a two-dimensional grating configuration for a vertical fiber-coupling fabricated in the silicon-on-insulator platform. A combination of sub-wavelength reflectors and blazed gratings enables both high coupling efficiency and vertical grating coupling. We experimentally achieve coupling efficiencies of -2.6 dB at 1544 nm and -3.4 dB at 1536 nm for x- and y-polarized LP01 modes, respectively. The experimental results are in good agreement with the simulated -2.4 dB coupling efficiency for both polarizations at a wavelength of 1550 nm. Simulated and measured crosstalk between two polarizations were -19 dB and <;-16 dB, respectively.

2-D Grating Couplers for Vertical Fiber Coupling in Two Polarizations