An in-line wavelength tunable filter based on holographic polymer-dispersed liquid crystal

• Main Authors: Chih-Hao Hsu, 徐志豪
• Other Authors: Lon Wang
• Format: Others
• Language: en_US
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/35784451672653124528

碩士 === 國立臺灣大學 === 光電工程學研究所 === 103 === An in-line wavelength tunable filter based on holographic polymer-dispersed liquid crystal (HPDLC) working in the communication band is demonstrated. PDLC is infiltrated in a hollow-core fiber whose single-mode waveguiding operation is achieved by shrinking the hollow-core diameter to an appropriate value. To periodically separate polymer and liquid crystal, two-beam interference exposure is employed, and a Bragg grating (BG) is thus formed. The resultant Bragg wavelength is shown tunable by applying an external voltage to the BG region. To reduce the coupling loss, tapered single-mode fibers (SMFs) are directly connected to the input and output ports of the HPDLC-based filter to realize an in-line fiber device.