  Grating lobes arise from the periodic nature of element spacing in the
optical phased array. Essentially, the phased array performs the Spatial
Fourier Transform on light; the steering capability of the main lobe is
governed by phase shift variations among waveguides, and the Sidelobe
Suppression Ratio (SLSR) correlates with the uniformity of emitter positions.
Leveraging this understanding, we have optimized a 1x64 channel passive
aperiodic OPAs with the uniform random shuffle in the emitter's position. Our
conceptual simulations highlight a robust steering capability (18.60{\deg} /
10nm) and SLSR (-13.46 dB @ 0{\deg} / -8.27 dB @ +/-45{\deg}), and initial
measurements demonstrate the steering capability (9.8 {\deg} / 10nm, with
smaller phase shifts design) and SLSR (-6.1dB @ -33.4{\deg}) from the
preliminary fabrication.
