红外与激光工程, 2017, 46 (7): 0720002, 网络出版: 2017-09-21   

中红外Ge20As20Se15Te45硫系玻璃光纤光栅光开关

Mid-infrared fiber grating optical switch of Ge20As20Se15Te45 chalcogenide glass
作者单位
1 宁波大学 宁波高等技术研究院 红外材料及器件实验室, 浙江 宁波 315211
2 浙江省光电探测材料及器件重点实验室, 浙江 宁波 315211
摘要
利用熔融淬冷法制备了Ge20As20Se15Te45硫系玻璃, 测试结果表明该玻璃在中红外波段具有良好的红外透过特性和极高的非线性, 采用Z-扫描技术测试其中红外三阶非线性系数高达n2=6.72×10-18 m2/W @ 4 μm。以此材料为基质, 设计了两种工作在中红外波段的硫系玻璃光纤光栅光开关。利用分布时域传递矩阵法(TD-TMM)和非线性耦合方程模拟计算了光栅光开关的反射谱和波长偏移特性。研究结果表明, 通过调节输入光强可以灵活调节光纤光栅的中心波长向短波或长波方向移动, 进而可以获得光开关。在调制深度为1×10-3的均匀硫系光纤光栅, 获得光开关的功率阈值约为1.6 GW/cm2, 当引入相移光栅后, 调制深度可以降低为3×10-4, 并且其光开关的功率阈值也降低到210 MW/cm2。
Abstract
Ge20As20Se15Te45 chalcogenide glass was prepared by a melt-quenching method. Testing results show that this glass posses high nonlinear characteristics and wide infrared transmission windows in the infrared region. The third-order nonlinear coefficient was tested to be n2=6.72×10-18 m2/W @ 4 μm by a Z-scan technique. Two kinds of chalcogenide glass infrared fiber grating optical switches were designed with this glass. The reflection spectrum and grating wavelength shift of optical switches were calculated with the distributed time-domain transfer matrix method (TD-TMM) and non-linear coupling equations. Results show that the Bragg wavelength can be flexibly tuned by modulating the input intensity and optical switch can be achieved. It was found that the power threshold is about 1.6 GW/cm2 for an optical switch with a modulation depth of 1×10-3 in a uniform chalcogenide Bragg fiber grating and the power threshold can be significantly reduced to about 210 MW/cm2 in a phase-shift chalcogenide fiber grating with a modulation depth of only 3×10-4.

张倩, 张培晴, 曾江辉, 戴世勋, 王训四. 中红外Ge20As20Se15Te45硫系玻璃光纤光栅光开关[J]. 红外与激光工程, 2017, 46(7): 0720002. Zhang Qian, Zhang Peiqing, Zeng Jianghui, Dai Shixun, Wang Xunsi. Mid-infrared fiber grating optical switch of Ge20As20Se15Te45 chalcogenide glass[J]. Infrared and Laser Engineering, 2017, 46(7): 0720002.

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