Low Power High Data Rate Modulator.

The objective of this program was to develop a high-data-rate-low-power modulator for doubled Nd:YAG applications with Gigabit/sec data rate capability, 3 W drive power and capable to handle 0.5 W cw power (3.3 W peak) using integrated optics techniques. An approach to the development of this modulator has been defined. Most notable is the demonstration of optical power handling capabilities of Ti diffused LiTaO3 waveguides of 300 mW with no damage and no power saturation. Prism coupling efficiency of 55% input and 80% output have been achieved. The waveguide losses at 5145 A have been measured to be 5 dB/cm. Single mode and multimode waveguides have been found by the in-diffusion process. The nature of the optical waveguide damage at room temperature and at elevated temperatures (approx 150 C) has been studied. The high optical power densities sustained by these structures were accommodated by high temperature operation of the waveguide structures. Preliminary experiments on Bragg deflection have also been carried out. (Author)