Integrated quasi-collinear acousto-optic mode converter with weighted coupling

Min Lv; Jianmin Cui; Wei Liu; Fang Cui; Yu-nan Sun

doi:10.1117/12.570849

31 January 2005 Integrated quasi-collinear acousto-optic mode converter with weighted coupling

Min Lv, Jianmin Cui, Wei Liu, Fang Cui, Yu-nan Sun

Proceedings Volume 5624, Semiconductor and Organic Optoelectronic Materials and Devices; (2005) https://doi.org/10.1117/12.570849
Event: Asia-Pacific Optical Communications, 2004, Beijing, China

Abstract

In the paper, a weighted-coupling scheme of a SiO₂ film-loaded Ti:LiNbO₃ quasi-collinear integrated acousto-optic mode converter is reported, in which an angular offset between the acoustic and optical waveguides is introduced to implement an optimized Hamming weighted function for realization of ultralow sidelobe level. Acoustic wave guiding properties have been investigated for films such as SiO₂, ZnO on LiNbO₃ firstly. SiO₂ film on LiNbO₃ was selected as acoustic waveguide. With the mode analysis of the acoustic wave guide and the theory of coupling mode the limit of the width, weighted coupling coefficient and the characteristics of the conversion of acousto-optic modes are obtained. As the angle between acoustical and optical waveguides is 0.45°, the worst sidelobe level is -16dB and the theoretical values of bandwidths of -3dB and -10dB is 1.37nm and 2.31nm respectively, which have excelled the domestic reported level.

Citation Download Citation

Min Lv, Jianmin Cui, Wei Liu, Fang Cui, and Yu-nan Sun "Integrated quasi-collinear acousto-optic mode converter with weighted coupling", Proc. SPIE 5624, Semiconductor and Organic Optoelectronic Materials and Devices, (31 January 2005); https://doi.org/10.1117/12.570849

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