Wide-Angle Beam-Steering Using an Optical Phased Array with Non-Uniform-Width Waveguide Radiators
Youngin Kim,
Hyeonho Yoon,
Jong-Bum You,
Minchul Kim,
Hyo-Hoon Park
Affiliations
Youngin Kim
Department of Electrical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu 34141, Daejeon, Korea
Hyeonho Yoon
Department of Electrical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu 34141, Daejeon, Korea
Jong-Bum You
Department of Nanodevice Technology, National NanoFab Center, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu 34141, Daejeon, Korea
Minchul Kim
Department of Electrical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu 34141, Daejeon, Korea
Hyo-Hoon Park
Department of Electrical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu 34141, Daejeon, Korea
We demonstrate wide-angle beam-steering using an optical phased array (OPA) with waveguide radiators designed with non-uniform widths to reduce the crosstalk between waveguides. The OPA consists of a silicon based 1 × 16 array of electro-optic phase shifters and end-fire radiators. The 16 radiators were configured with four different widths and a half-wavelength spacing, which can remove the higher-order diffraction patterns in free space. The waveguides showed a low crosstalk of −10.2 dB at a wavelength of 1540 nm. With phase control, the OPA achieved wide beam-steering of over ±80° with a side-lobe suppression of 7.4 dB.
