An in-line wavelength tunable filter based on holographic polymer-dispersed liquid crystal
Date Issued
2015
Date
2015
Author(s)
Hsu, Chih-Hao
Abstract
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.
Subjects
fiber Bragg grating
HPDLC
wavelength tunable filter
hollow core fiber
Type
thesis
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