Journal
OPTICS EXPRESS
Volume 23, Issue 24, Pages 30641-30650Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.030641
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Funding
- Ministry of Science and Technology (MOST) of Taiwan [102-2221-E-008-099-MY2, 104-2221-E-008-094]
- Australian Research Council through Discovery and Centre of Excellence programs
- German Academic Exchange Service [NSC-DAAD: 102-291-I-100-523]
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We report on the realization of adiabatic light transfer in lithium niobate (LiNbO3) waveguides. This peculiar adiabatic tunneling scheme was implemented in a three-waveguide coupling configuration with the intermediate waveguide being inclined with respect to the outer waveguides to facilitate the adiabatic passage process. We have investigated and determined the adiabatic conditions of the LiNbO3 device in terms of the structure configuration of the waveguide system and found optimal structure parameters by both simulation and experimental approaches. Broadband adiabatic couplings of bandwidth similar to 456 and 185 nm and peak coupling efficiencies of >0.96 have been obtained with a 2-cm long device for TE- and TM-polarized fundamental modes, respectively. Longer (5 cm) devices were also studied and found to be useful in increasing the adiabaticity of the device, especially for the TM-polarized mode. (C) 2015 Optical Society of America
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