Abstract:The center frequency of the narrow-band THz wave is always unstable with the optical rectification methods. Therefore, the high-phase stable time-delay generator Etalon and the parallel grating pair compressor with the self-adaptive optical path compensation function are designed according to the principle that two lasers in different paths will result in specific relative time delay; with LiNbO3 waveguide sample as the optical rectification crystal, the quasi-multi-cycle narrow-band THz wave generating platform is set up based on the two chirp-delay schemes (one Compressor in the pump branch and another Compressor in the probe branch) Both schemes can generate narrow-band THz waves with adjustable center frequency from 0.25~1.2THz. The bandwidth is 100GHz, with good frequency stability.

There is clear difference in each fiber-optic link's power output, in the large scale optically controlled phased array antenna. In order to realize the optical power balance and control between the various channels, the equilibrium or control power of each optical signal needs to be considered, and it will reduce the optical beam forming network generated side-lobe beam, which results in the performance improvement of the system. In this paper, the methods of optical power equalization and control have been proposed, which is used in the forming network of the optical beam. The method can realize the optical power's equalization and control of each optical signal. In the end of this paper, the verification and results are provided.