20 February 2017 Accurate core position control in polymer optical waveguides using the Mosquito method for three-dimensional optical wiring
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Proceedings Volume 10109, Optical Interconnects XVII; 101090I (2017) https://doi.org/10.1117/12.2251076
Event: SPIE OPTO, 2017, San Francisco, California, United States
Abstract
Polymer optical waveguides with graded-index (GI) circular cores are fabricated using the Mosquito method, in which the positions of parallel cores are accurately controlled. Such an accurate arrangement is of great importance for a high optical coupling efficiency with other optical components such as fiber ribbons. In the Mosquito method that we developed, a core monomer with a viscous liquid state is dispensed into another liquid state monomer for cladding via a syringe needle. Hence, the core positions are likely to shift during or after the dispensing process due to several factors. We investigate the factors, specifically affecting the core height. When the core and cladding monomers are selected appropriately, the effect of the gravity could be negligible, so the core height is maintained uniform, resulting in accurate core heights. The height variance is controlled in ±2 micrometers for the 12 cores. Meanwhile, larger shift in the core height is observed when the needle-tip position is apart from the substrate surface. One of the possible reasons of the needle-tip height dependence is the asymmetric volume contraction during the monomer curing. We find a linear relationship between the original needle-tip height and the core-height observed. This relationship is implemented in the needle-scan program to stabilize the core height in different layers. Finally, the core heights are accurately controlled even if the cores are aligned on various heights. These results indicate that the Mosquito method enables to fabricate waveguides in which the cores are 3-dimensionally aligned with a high position accuracy.
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Kumi Date, Takaaki Ishigure, "Accurate core position control in polymer optical waveguides using the Mosquito method for three-dimensional optical wiring", Proc. SPIE 10109, Optical Interconnects XVII, 101090I (20 February 2017); doi: 10.1117/12.2251076; https://doi.org/10.1117/12.2251076
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