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Optically switchable all-fiber optic polarization rotator
Authors:Vincent K.S. Hsiao  Wei-Huan Fu  Ching-Yun Huang  Zhe Chen  Siben Li  Jianhui Yu  Jun Zhang  Jieyuan Tang
Affiliation:1. Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Nantou, Taiwan, 54561;2. Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Educational Institutes, Jinan University, Guangzhou, 510632 China;1. Department of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan;2. Department of Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan;1. Institute of Microelectronics, NCSR “Demokritos” Athens, Greece;2. Department of Materials Science and Engineering, University of Ioannina, Ioannina, Greece;3. Department of Electronics, TEI of Peiraeus, Egaleo, Greece;4. Industrial Chemistry Laboratory, Department of Chemistry, University of Athens, Athens, Greece;1. MIIT Key Laboratory of Advanced Solid Laser, Nanjing University of Science and Technology, No. 200 Xiaolingwei, Nanjing 210094, China;2. Department of Electronic and Optical Engineering, Nanjing University of Science and Technology, No. 200 Xiaolingwei, Nanjing 210094, China
Abstract:This study demonstrates an all-fiber optical polarization rotator and switch based on a side-polished fiber (SPF) overlaid with a photoresponsive liquid crystal (LC) containing a nematic LC and a photosensitive azobenzene molecule. The trans-cis photoisomerization of azobenzene modulates the overlaid LC's birefringence, changes the refractive index (RI) of the photoresponsive LC-overlaid SPF, and further controls and switches the phase retardation. This design achieves a 10° phase shift under switching time of less than 1 s. The demonstration has potential for an optically tunable in-line 2 × 2 fiber-optic switch or microstructured fiber-based photonic device controlled by the polarization of light.
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