调节精度可配置的可变光衰减器研究  

Variable Optical Attenuator with Configurable Adjustment Accuracy

作　　者：魏硕 陈陶[1] 谌静[1] 孔梅梅[1] 关建飞 Wei Shuo;Chen Tao;Chen Jing;Kong Meimei;Guan Jianfei(College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing 210000,Jiangsu,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,江苏南京210000

出　　处：《光学学报》2023年第2期1-7,共7页Acta Optica Sinica

基　　金：国家自然科学基金(11974188,61905117);中国博士后科学基金(2021T140339,2018M632345);江苏省博士后科学基金(2021K617C);南京邮电大学科研基金项目(NY220050)。

摘　　要：设计了一种调节精度可配置的可变光衰减器结构,通过流体恒压泵驱动薄膜弹起,将流体压力/压强调节转化为光纤微位移控制,实现对接光纤横向位错及光学衰减。使用多物理场耦合与三维时域有限差分的方法对结构模型进行分析,并利用精细加工技术实现了器件的制作。通过对薄膜厚度的选配,实现了光强耦合效率的精度可调配置。理论分析和实验结果表明,选用合适的膜厚得到本衰减器的插入损耗为1.24 dB,可变衰减范围大于60 dB,波长相关损耗小于1 dB。当设定可变光衰减器的光衰减动态范围分别为10 dB和40 dB时,配置0.5 mm薄膜厚度的调节精度分别优于0.04 dB和0.11 dB;当膜的厚度增加时,调节精度会更高。Objective A variable optical attenuator is a key component for wavelength division multiplexing(WDM)transmission node power equalization,optical amplifier gain flattening,multiplexing point channel balancing,and receiving node power management in fiber optic communication.A fiber optic type variable optical attenuator has the advantages of simple structure,low insertion loss,low cost,and easy to interface with other optical fibers and waveguide structure,and is widely used.The adjustment accuracy and attenuation range are very important parameters of the variable optical attenuator,and there are few products with high adjustment accuracy and large attenuation range.In this paper,based on the traditional dislocation-type optical fiber variable optical attenuator with large dynamic range,the fluid pressure/pressure regulation is transformed into optical fiber micro-displacement control,which is easy to realize the microdisplacement precision control of optical fiber products to replace the high cost precision mechanical adjustment instrument of such products.In addition,the device meets the requirements of optical networks for attenuators,can work in a wide range of attenuation,and has low insertion loss and low wavelength-dependent loss,as well as compact structure,low cost,and high accuracy.According to the VOA optical power adjustment curve,film thickness can be selected to achieve configurable VOA optical attenuation accuracy.Methods The designed variable optical attenuator device is fabricated by ultra-precision processing technology.It contains components such as the polydimethylsiloxane(PDMS)elastic film,optical fiber carrying platform,and constant pressure pump.The adjustment of fluid pressure is transformed into micro-displacement control of the optical fiber by driving the ejection of the film through the fluid constant pressure pump,thus realizing the lateral dislocation of the docking fiber,and the optical attenuation is realized based on the dislocation of the ejected film driven by the fluid constant

关 键 词：光通信 可变光衰减器 横向位错 薄膜驱动 精度可配置 

分 类 号：TN761[电子电信—电路与系统]