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Polymers 2018, 10(5), 497; https://doi.org/10.3390/polym10050497

Optical Waveguide Tunable Phase Delay Lines Based on the Superior Thermo-Optic Effect of Polymer

Department of Electronics Engineering, Pusan National University, Pusan (Busan) 46241, Korea
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Received: 29 March 2018 / Revised: 30 April 2018 / Accepted: 3 May 2018 / Published: 4 May 2018
(This article belongs to the Special Issue Polymeric Materials for Optical Applications)
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Abstract

Strong thermo-optic effect of polymers is useful for fabricating tunable phase-delay devices with low power consumption and wide tuning range. However, if the temperature change is increased to extend the tuning range, an attenuation of the guided light is accompanied by the refractive index gradient across the waveguide core. For three different waveguide structures, in this study, the optimal structure of the device for a variable phase delay line was found by investigating the attenuation and interference phenomena accompanying phase modulation. By improving the uniformity of thermal distribution across the waveguide core, a phase delay of 130π rad was obtained with an output attenuation less than 0.5 dB. View Full-Text
Keywords: polymer waveguide; phase delay line; thermo-optic effect; birefringence modulation polymer waveguide; phase delay line; thermo-optic effect; birefringence modulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kim, S.-M.; Park, T.-H.; Huang, G.; Oh, M.-C. Optical Waveguide Tunable Phase Delay Lines Based on the Superior Thermo-Optic Effect of Polymer. Polymers 2018, 10, 497.

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