Two-dimensional beam-steering with wavelength control using one-dimensional optical phased array

We demonstrate two-dimensional (2-D) beam-steering using only wavelength control from one-dimensional silicon-based OPA, where path differences are sequentially formed in each channel. With 79.6-mu m path difference in phase-feeding lines and a 2-mu m pitch in grating radiators, we achieved a continuous transversal steering about 46 degrees and a longitudinal steering near 13 degrees with a wavelength tuning of 90 nm. The single-beam with divergence angle of 4 degrees was formed by phase initialization using electro-optic optic p-i-n phase shifters before beam-steering.