Step-changed period chirped long-period fiber gratings fabricated by CO2 laser |
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| Authors: | Ming Yan Shouyu Luo Yilei Wang Zhiming Zhang |
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| Institution: | a Institute of Optics and Photonics, Department of Physics, State Key Laboratory on Fiber Optic Local Area Networks and Advanced Optical Communication Systems, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
b Laboratory of Photonic Information Technology, School of Information and Photoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, People’s Republic of China |
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| Abstract: | A CO2 laser and point-by-point method are used for fabricating step-changed period chirped long-period fiber gratings (LPFG). Several types of period chirped LPFGs have been demonstrated, such as, linearly chirp, peak-shape chirp, and cascaded linearly chirp. Unlike uniform LPFGs, the spectrum change such as multiple attenuation peaks, broader spectrum can be seen in these chirp gratings, and the spectral shape can be controlled by the grating period. Especially, the cascaded linearly chirped LPFGs performs a multi-peak as interference between the core mode and cladding mode, which can be used as multi-wavelength filters in fiber optic communication and fiber optic sensors. Also, a linear tuning range of 1.6 nm with -0.559 pm/με tuning rate is achieved in these types of devices by applying an axial strain. |
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| Keywords: | Long-period fiber grating Chirp Step-changed CO2 laser |
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