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Gallium oxide used as a diffusion source for the fabrication of lithium niobate optical waveguides is presented. The optical waveguide properties are investigated and the behavior of the in-diffused gallium is characterized by the secondary ion mass spectroscopy. Single-mode single-polarization optical waveguides with low propagation loss at 632.8 and 1550 nm can be obtained. For reference, the diffusion constant and activation energy of the in-diffused gallium atoms are also obtained.

PurposeThis study deals with attenuating the risk of relying on a single export market, which was heightened by the outbreak of the COVID-19 pandemic. It focuses on Taiwanese atemoya (a fruit with short storage life) and the adoption of active controlled atmosphere (CA) containers, a new technology which lengthens storage time for other export markets. This study looks at the financial feasibility of the technology's first ever use in atemoya exports.Design/methodology/approachApart from the standard financial assessment tools—like net present value (NPV), internal rate of return (IRR), benefit-cost ratio (BCR) and payback period (PBP)—this study calibrated five different scenarios based on data gathered from relevant market agents including suppliers, exporters, customs brokers and technology developer.FindingsDue to the high profit margin and low investment cost, the use of active CA containers for long-haul exports of this highly perishable fruit is found both technically and financially feasible, despite the generally higher operational cost during the pandemic.Research limitations/implicationsThis study looked at three specific export markets: Malaysia, Dubai and Canada. Results here may lack generalizability in other markets, although it is believed that slight deviations would not invalidate the conclusions of this research because short, medium and long distances were all covered therein.Originality/valueThis paper studies the first time that active CA is used for export of atemoyas to expand existing markets.

Mach-Zehnder modulators fabricated by gallium diffusion in y-cut lithium niobate (LiNbO 3 ) are presented. The measured halfwave voltages are 6.2 and 3.2 V when the electrode lengths are 0.4 and 0.8 cm, respectively. By calculating the overlap integral between the modulating electric and the guided optical fields, the value of the electrooptic coefficient r 33 is found in good agreement with that of the bulk LiNbO 3 , which indicates no significant degradation in r 33 is induced by the in-diffused gallium atoms.

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