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《Acta Photonica Sinica》 2017-07
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Fabrication of Bragg Gratings in Low-loss As_2S_3 Chalcogenide Fibers Using +1/-1 Phase Mask and 532nm Laser

ZOU Lin-er;HE Pan-pan;FU Ji-wu;CHEN Bao-xue;Department of Physics,Nanchang University;School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology;  
Adopting modified Sagnac interference grating writing system,the fiber Bragg gratings were written in two kinds of As_2S_3 chalcogenide fibers with different cladding diameter by use of a near bandgap light at 532 nm and +1/-1 diffracted orders phase mask,and the gratings dynamic characteristics during the exposure were studied.It is found that the depth of grating transmission peak in low-loss As_2S_3 chalcogenide fiber increases with a decrease of the cladding diameter.During exposure,the Bragg wavelength shifts fast towards short wavelength at first,and then with increasing exposure time restores slowly towards long wavelength.At exposure time from 800 sto 1000s,the good quality Bragg grating with about-2.6dB bandgap and about 0.37 nm bandwidth in transmission spectra was fabricated in As_2S_3 chalcogenide fiber with about 140μm cladding diameter.In addition,an analysis of photosensitivity in the As_2S_3 chalcogenide fiber core shows that the refractive index modulation amplitude and the change of average refractive index with the exposure time can achieve to be on the order of 10-4and 10-3,respectively.
【Key Words】: Integrated optics Fiber Bragg gratings Chalcogenide glasses Photosensitivity Refractive index
【Fund】: 国家自然科学基金(Nos.61465008 61077042)资助~~
【CateGory Index】: TN253
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