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A phase-shifted linearly chirped fiber Bragg grating with tunable bandwidth |
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| Authors: | N.Q. Ngo S.Y. Li L.N. Binh S.C. Tjin |
| Affiliation: | aPhotonics Research Center, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore bDepartment of Electrical and Computer Systems Engineering, Monash University, Clayton, Victoria 3180, Melbourne, Australia |
| Abstract: | We demonstrate a new method to broaden and adjust the transmission bandwidth of a phase-shifted linearly chirped fiber Bragg grating (PS-LCFBG) after its fabrication. A movable thermal head is used to heat the PS-LCFBG at a small contact point. The original ultra-narrow transmission bandwidth of the PS-LCFBG can be broadened due to both the presence of the passband peak caused by the thermally-induced temporary phase shift and the passband caused by the thermally-induced local Bragg wavelength shift. The transmission bandwidth of the new passband peak can be adjusted by changing the position of the thermal head. The transmission bandwidth of the PS-LCFBG can be broadened from <10 pm to 0.16 nm, and can be tuned from 0.16 to 1.05 nm. |
| Keywords: | Phase shift Fiber Bragg grating Tunable filter Bandpass filter Optical filter |
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