基于光栅局域温度控制的高精度多相移的产生和滤波器的制备  

High-Precision Multiphase Shifts Generation and Filter Fabrication Based on Grating Local Temperature Control

作　　者：梁虹 应康[1] 王迪[3] 魏金金 李璇[1] 皮浩洋[1] 魏芳[1] 蔡海文[1,2] Liang Hong;Ying Kang;Wang Di;Wei Jinjin;Li Xuan;Pi Haoyang;Wei Fang;Cai Haiwen(Key Laboratory of Space Laser Communication and Detection Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;National Key Laboratory of Science and Technology on Space Microwave,China Academy of Space Technology-Xi'an,Xi'an,Shaanxi 710100,China)

机构地区：[1]中国科学院上海光学精密机械研究所空间激光信息传输与探测技术重点实验室,上海201800 [2]中国科学院大学材料与光电研究中心,北京100049 [3]中国空间技术研究院西安分院空间微波技术国家级重点实验室,陕西西安710100

出　　处：《中国激光》2021年第16期104-114,共11页Chinese Journal of Lasers

基　　金：国家重点研发计划(2020YFB0408300,2020YFB0408301);国家自然科学基金(61535014,61805260);上海市自然科学基金(18ZR1444300);科工局稳定支持基金(HTKJ2020KL504004);钱学森青年创新基金。

摘　　要：提出了一种利用局域温度控制的高精度相移控制技术制备多相移光纤光栅滤波器的方法。首先,分析了多相移光纤光栅中相移量和相移位置的误差对多相移光纤光栅滤波器的插入损耗、带宽和形状因子的影响,得到了高性能多相移光纤光栅制备所需的相移量精度(0.0029π)和相移位置精度(368μm)。然后,实验证实了利用局域温度控制引入高精度相移(相移量精度为0.0007π,相移位置精度为30μm)的可行性。最后,利用所提方法制备了多相移光纤光栅,并对其光谱进行了测试和理论仿真。结果表明,基于所提方法制备的多相移光纤光栅滤波器的频率响应接近理论仿真下的理想滤波器特性,插入损耗约为0.5 dB,3 dB带宽约为366 MHz, 20 dB带宽约为972 MHz,形状因子约为0.38。所提制备多相移光纤光栅滤波器的方法精确、简单、经济,没有对光纤光栅的结构造成永久性的改变,具有相移量可擦除的优势,可进一步应用于制备新型可调谐光纤滤波器。Objective Ultranarrow bandpass optical filters are key components for signal processing in the fields of microwave photonics,dense wavelength-division multiplexing,coherent communication,and optical fiber sensing.The ideal ultranarrow bandpass optical filter has a rectangular frequency response composed of an ultraflat passband and a very steep edge.The flat passband has high signal fidelity and can prevent the signal from being distorted,whereas the steep edge can suppress the crosstalk between the adjacent bands.Fiber Bragg gratings(FBG)that achieve various frequency responses are commonly used in bandpass optical filters towing to their small size,anti-electromagnetic interference,low insertion loss,and compatibility with other optical fiber devices and systems.However,the ordinary uniform FBG bandwidth is relatively large,in a dozen GHz or hundred GHz.Although the phase-shifted fiber Bragg grating can achieve a bandwidth below 100 MHz,its Lorentz or quasi-Lorentz line frequency response limits its application in high-resolution signal processing.Recently,the multiphase-shifted FBG(MPSFBG)containing multiple phase shifts have been used to design the ultranarrow bandpass optical filters.The MPSFBG can obtain the narrow band flat-top filter response with small insertion loss and good rectangularity by optimizing the position of eachπphase shift.In actual preparation,there are errors in the control of the phase-shift amount and phase-shift position,which result in the difference between the actual optical spectra and theoretically calculated optical spectra under ideal conditions.Therefore,the introduction of a high-precision phase shift is the key to the fabrication of the MPSFBG.Methods This study presents a method for fabricating the MPSFBG by introducing a high-precision phase shift into the FBG using local temperature control.First,the influence of the phase-shift amount and position errors on the insertion loss,bandwidth,and shape factor of the MPSFBG filter is analyzed in the theoretical part of this stud

关 键 词：光纤光学 光纤器件 多相移光纤布拉格光栅 局域温度控制 光学滤波器 

分 类 号：TN253[电子电信—物理电子学]