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        Optical-Loss Measurement of a Silicon-Slab Waveguide

        Wildan Panji Tresna,Alexander William Setiawan Putra,Takeo Maruyama 한국광학회 2020 Current Optics and Photonics Vol.4 No.6

        A mirror-in-slab waveguide is fabricated on a slab waveguide by using the refractive-index contrast between two materials, with the reflection performance depending on the slab waveguide’s design. In this research, a slab waveguide design consisting of silicon (Si) as the core and SiO 2 as the substrate was designed and developed to determine the coupling, waveguide, and mirror losses. Based on experimental results, coupling loss is dominant and is affected by the design of the slab waveguide. Furthermore, the mirror loss is affected by the design of the mirror, such as the curvature radius and the size of the mirror. TE and TM polarizations of light are used in the measurements. The experimental results show that mirror losses due to reflection by mirrors are 0.011 dB/mirror and 0.007 dB/mirror for TE and TM polarizations respectively. A simulation was performed to confirm whether the size of mirror is sufficient to reflect the input light, and to check the quality of the surfaces of fabricated mirrors.

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