A 2×2 and a 1×4 fiber-type optical phased array with PZT phase shifters have been implemented. Fibers are adopted as
transmission paths and emitting antennas in the optical phased array system. By using the feedback optimization we had
proposed before, the inaccuracy of fiber length is overcome. By adjusting the phase shift of each PZT phase shifter
repeatedly according to the algorithm we had proposed for optimization, 1-D and 2-D beam forming and beam steering
in a short period of time have been observed respectively. Moreover, a 1×6 fiber array is also tried. Although the
interference is not stable enough, much narrower beams are achieved.
Using the split-step Fourier method, the nonlinear effects and higher-order dispersion in optical fiber are studied and
numerically analyzed. Based on the analysis, the theoretical model of higher-order dispersion compensation with phased
modulator is presented, with emphasis on the third-order dispersion. According to the theoretical model, simulation
models based on VPItransmission is designed. Finally, experimental schemes are designed, and experiment is finished:
200-fs pulses propagate through a 47-km fiber link, including a 39.8-km SMF (single-mode fiber) and a 6.71-km DCF
(dispersion-compensation fiber). In that experiment, the oscillating tails are completely suppressed and the third-order
dispersion is successfully compensated with the phase modulator. Moreover, the parameters of modulator are optimized
with VPItransmission Modeling.