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Chin. Phys. B, 2023, Vol. 32(2): 024205    DOI: 10.1088/1674-1056/ac9a37

Multi-band polarization switch based on magnetic fluid filled dual-core photonic crystal fiber

Lianzhen Zhang(张连震), Xuedian Zhang(张学典), Xiantong Yu(俞宪同), Xuejing Liu(刘学静), Jun Zhou(周军), Min Chang(常敏), Na Yang(杨娜), and Jia Du(杜嘉)
Key Laboratory of Optical Technology and Instrument for Medicine, Ministry of Education, University of Shanghai for Science and Technology, Shanghai 200093, China
Abstract  The research of high-performance polarization controllers is of great significance for expanding the application field of polarization optics. Here, a polarization switch is demonstrated by using a dual-core photonic crystal fiber (DCPCF) with four symmetrical air holes, placed above and below each core, filled with magnetic fluid (MF). The switch, which utilizes a magnetic field to change the coupling length ratio of the x and y polarization modes, enables dynamic tuning of the polarization state and extinction ratio. Numerical results show that when the working length is 36.638 mm, the magneto-optical polarization switch can operate in four communication bands, i.e., 1509 nm to 1520 nm, 1544 nm to 1556 nm, 1578 nm to 1591 nm, and 1611 nm to 1624 nm. Moreover, the extinction ratio (ER) is greater than 20 dB in the fiber length range of 38.5 mm to 38.7 mm, indicating that the device has a good fault tolerance for the interception of the fiber length.
Keywords:  polarization switch      magnetic fluid      dual-core photonic crystal fiber  
Received:  07 August 2022      Revised:  04 October 2022      Accepted manuscript online:  14 October 2022
PACS:  42.25.Ja (Polarization)  
  42.81.-i (Fiber optics)  
  42.81.Gs (Birefringence, polarization)  
  42.81.Wg (Other fiber-optical devices)  
Fund: Project supported by the National Key Research and Development Program of China “National Quality Infrastructure” (Grant No. 2021YFF0600902).
Corresponding Authors:  Xuedian Zhang     E-mail:

Cite this article: 

Lianzhen Zhang(张连震), Xuedian Zhang(张学典), Xiantong Yu(俞宪同), Xuejing Liu(刘学静), Jun Zhou(周军), Min Chang(常敏), Na Yang(杨娜), and Jia Du(杜嘉) Multi-band polarization switch based on magnetic fluid filled dual-core photonic crystal fiber 2023 Chin. Phys. B 32 024205

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