Miniaturized fiber-Bragg-grating (FBG) interrogators are of interest for applications in the areas where weight and size controlling is important, e.g., airplanes and aerospace or in-situ monitoring. An ultra-compact high-precision on-chip interrogator is proposed based on a tailored arrayed waveguide grating (AWG) on a silicon-on-insulator (SOI) platform. The on-chip interrogator enables continuous wavelength interrogation from 1 544 nm to 1 568 nm with the wavelength accuracy of less than 1 pm [the root-mean-square error (RMSE) is 0.73 pm] over the whole wavelength range. The chip loss is less than 5 dB. The 1 × 16 AWG is optimized to achieve a large bandwidth and a low noise level at each channel, and the FBG reflection peaks can be detected by multiple output channels of the AWG. The fabricated AWG is utilized to interrogate FBG sensors through the center of gravity (CoG) algorithm. The validation of an on-chip FBG interrogator that works with sub-picometer wavelength accuracy in a broad wavelength range shows large potential for applications in miniaturized fiber optic sensing systems.

通过固相反应结合真空烧结制备了(CexLu1-x)3Al5O12(Ce∶LuAG，x=0.0005，0.001，0.002，0.003，0.004)透明陶瓷。厚度为1.0 mm的Ce∶LuAG陶瓷在500~800 nm波长范围内的直线透过率大于75%。研究了不同浓度Ce∶LuAG陶瓷在454 nm蓝光LED激发下的吸收和发射特性，获得了可调的相关色温(5 653~7 433 K)。 所制备的Ce∶LuAG陶瓷具有优异的热性能和发光性能，在225 ℃下的PL强度较室温仅下降7%，0.1%Ce∶LuAG陶瓷在蓝光LED激发下的发光效率达到179 lm/W。进一步研究了不同厚度Ce∶LuAG陶瓷的发光饱和性能，1 mm厚的0.1%Ce∶LuAG陶瓷在功率密度为24.6 W/mm2的蓝光LD激发下获得了3 646 lm的高光通量，同时没有出现发光饱和现象。研究结果表明，Ce∶LuAG透明陶瓷具有高发光效率和热稳定性，适合用于大功率固态照明。