Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 22, Issue 15, Pages 1123-1125Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2010.2049738
Keywords
All-optical devices; fiber Bragg gratings (FBGs); fiber optics and optical communication
Funding
- National Natural Science Foundation of China (NNSFC) [10874250, 10674183, 60877044, 10776009 (NSAF)]
- National 973 Project of China [2004CB719804]
- National Science Council of Taiwan [98-2221-E-260-001]
- Foundation of Ministry of Education of China [20060558068]
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This work presents the photoinduced wavelength shift of a side-polished fiber Bragg grating (SPFBG) with a photoresponsive liquid crystal (LC) overlay. The reflection peak wavelength of the SPFBG is tuned by refractive index (RI) modulation, which comes from the phase transition of the overlaid photoresponsive LC under ultraviolet (UV) light irradiation. The wavelength shift of 0.66 nm is observed with the UV light irradiation density of 0.64 mW/mm(2). During the phase transition of the photoresponsive LC, the increase of RI leads to the reflected Bragg wavelength red-shift and the shift is reversible and repeatable. The photoresponsive LC-overlaid SPFBG has potential applications as an active filter in all-fiber telecommunication systems and fiber-based light sensing devices
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