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Free-spectral range tunable Fabry-Perot filter with superimposed fiber Bragg gratings |
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| Authors: | Shuang Liu Xinyong Dong Ping Shum |
| Affiliation: | a Department of Optoelectronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China b Network Technology Research Centre, 50 Nanyang Drive, Research Techno Plaza, 4th Storey, Nanyang Technological University, 637553 Singapore, Singapore c Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China |
| Abstract: | A novel free-spectral range (FSR) tunable Fabry-Perot filter (FPF) with two superimposed fiber Bragg gratings (SFBGs) is proposed and experimentally demonstrated. The SFBGs, initially uniform in period with slightly different Bragg wavelengths, were glued onto the lateral surface of a specially-designed cantilever beam and linearly chirped by beam bending-induced strain gradient. As a result, their reflection bands overlap and a grating-based FPF with a tunable FSR is formed. A continuously tunable FSR of 0.1-0.5 nm has been achieved in the experiment. |
| Keywords: | Fabry-Perot Free-spectral range Superimposed fiber Bragg grating |
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