A Ti: Lithium Niobate <sub> 3 </ Sub> Waveguide Optical Switch

With development of optical network and optical communication, and the introduction of conception of optical swap, optical switch and optical switch array is playing an important role.Lithium niobate (LiNbO3) has been studied and documented extensively for over three decades because of its good electro-optic coefficient and acousto-optic coefficient, its ease of processing, and its environmental stability. It is readily available commercially and is the material of choice for external modulators in long-distance high-bit-rate systems up to l0GHz.In this paper, we computed and found the main parameter for facture of Ti:LiNbO3 waveguide, by the function of Ti diffusion profile in LiNbO3, and the waveguide mode's cut-off condition. The parameters include waveguide width: 8μm, titanium film thickness:50~60nm, index change: 0.006, diffusion temperature: 1050 and diffusion time: 9~10 hours.Designed and produced a 2 X 2 coupler Optical switch and a 1 X 2 digital optical switch. The coupler optical switch was produced by AP reversal structure, with the main parameters such as total length of switch: 30mm, waveguides' center distance: Hum, interaction length: 17mm, and at 17V with a crosstalk of -18dB. The digital optical switch was produced by asymmetry electrode Y branch structure. The main parameters of this switch such as switch length: 25mm, the angle of Y branch: 0=0.1? center distance at branch end: 30μm, the center distance of electrons(+/-): 12μm, and at 27V with a crosstalk of 18dB.